diff --git a/docs/search-index.json b/docs/search-index.json
index 8a8ed4fd9..050af12bb 100644
--- a/docs/search-index.json
+++ b/docs/search-index.json
@@ -1 +1 @@
-[{"t":"Prerequisites","d":"Node.js v10","k":"prerequisites node","l":"/install#prerequisites"},{"t":"Prebuilt binaries","d":"Ready-compiled sharp and libvips binaries are provided for use with Node.js v10 on the most common platforms macOS x64 10.13 Linux x64 glibc 2.17, musl 1.1.24 Linux ARM64 glibc 2.2","k":"prebuilt binaries compiled sharp libvips node common platforms macos linux glibc musl arm","l":"/install#prebuilt-binaries"},{"t":"Common problems","d":"The architecture and platform of Node.js used for npm install must be the same as the architecture and platform of Node.js used at runtime. See the cross-platform","k":"common problems architecture platform node npm install runtime cross","l":"/install#common-problems"},{"t":"Apple M1","d":"Prebuilt libvips binaries are provided for macOS on ARM64 since sharp v0.28.0. During npm install sharp will be built locally, which requires Xcode and Python - see building from s","k":"apple prebuilt libvips binaries macos arm sharp during npm install built locally requires xcode python building","l":"/install#apple-m1"},{"t":"Custom libvips","d":"To use a custom, globally-installed version of libvips instead of the provided binaries, make sure it is at least the version listed under config.libvips in the package.json file a","k":"custom libvips globally installed version instead binaries make listed config package json file","l":"/install#custom-libvips"},{"t":"Building from source","d":"This module will be compiled from source at npm install time when a globally-installed libvips is detected set the SHARP_IGNORE_GLOBAL_LIBVIPS environment variable to skip this, pr","k":"building source module compiled npm install time globally installed libvips detected environment variable skip","l":"/install#building-from-source"},{"t":"Custom prebuilt binaries","d":"This is an advanced approach that most people will not require. To install the prebuilt sharp binaries from a custom URL, set the sharp_binary_host npm config option or the npm_con","k":"custom prebuilt binaries advanced approach people require install sharp url npm config option npmcon","l":"/install#custom-prebuilt-binaries"},{"t":"Chinese mirror","d":"A mirror site based in China, provided by Alibaba, contains binaries for both sharp and libvips. To use this either set the following configuration sh npm config set sharp_binary_h","k":"chinese mirror site china alibaba contains binaries sharp libvips following configuration npm config sharpbinaryh","l":"/install#chinese-mirror"},{"t":"FreeBSD","d":"The vips package must be installed before npm install is run. sh pkg install -y pkgconf vips sh cd /usr/ports/graphics/vips/ make install clean","k":"freebsd vips package installed npm install run pkg pkgconf usr ports graphics make clean","l":"/install#freebsd"},{"t":"Linux memory allocator","d":"The default memory allocator on most glibc-based Linux systems e.g. Debian, Red Hat is unsuitable for long-running, multi-threaded processes that involve lots of small memory alloc","k":"linux memory allocator glibc systems debian red hat unsuitable long running multi threaded processes small alloc","l":"/install#linux-memory-allocator"},{"t":"Heroku","d":"Add the jemalloc buildpack to reduce the effects of memory fragmentation. Set NODE_MODULES_CACHE","k":"heroku add jemalloc buildpack reduce effects memory fragmentation","l":"/install#heroku"},{"t":"AWS Lambda","d":"The binaries in the node_modules directory of the deployment package must be for the Linux x64 platform. When building your deployment package on machines other than Linux x64 glib","k":"aws lambda binaries nodemodules directory deployment package linux platform building your machines other than glib","l":"/install#aws-lambda"},{"t":"Webpack","d":"Ensure sharp is added to the externals configuration. js externals sharp commonjs sharp","k":"webpack sharp added externals configuration commonjs","l":"/install#webpack"},{"t":"Worker threads","d":"The main thread must call requiresharp before worker threads are created to ensure shared libraries remain loaded in memory until after all threads are complete.","k":"worker threads main thread requiresharp created shared libraries remain loaded memory complete","l":"/install#worker-threads"},{"t":"Canvas and Windows","d":"The prebuilt binaries provided by canvas for Windows depend on the unmaintained GTK 2, last updated in 2011. These conflict with the modern, up-to-date binaries provided by sharp.","k":"canvas windows prebuilt binaries depend unmaintained gtk last updated conflict modern date sharp","l":"/install#canvas-and-windows"},{"t":"Sharp","d":"Constructor factory to create an instance of sharp, to which further methods are chained. JPEG, PNG, WebP, AVIF or TIFF format image data can be streamed out from this object. When","k":"sharp constructor factory create instance further methods chained jpeg png webp avif tiff format data streamed out object failonerror sequentialread density pages page subifd level animated raw","l":"/api-constructor#sharp"},{"t":"metadata","d":"Fast access to uncached image metadata without decoding any compressed image data. A Promise is returned when callback is not provided. format Name of decoder used to decompress im","k":"metadata fast access uncached decoding compressed data promise returned callback format name decoder decompress","l":"/api-input#metadata"},{"t":"stats","d":"Access to pixel-derived image statistics for every channel in the image. A Promise is returned when callback is not provided. channels Array of channel statistics for each channel","k":"stats access pixel derived statistics channel promise returned callback channels array","l":"/api-input#stats"},{"t":"toFile","d":"Write output image data to a file. If an explicit output format is not selected, it will be inferred from the extension, with JPEG, PNG, WebP, AVIF, TIFF, DZI, and libvips V format","k":"tofile write output data file explicit format selected inferred extension jpeg png webp avif tiff dzi libvips","l":"/api-output#tofile"},{"t":"toBuffer","d":"Write output to a Buffer. JPEG, PNG, WebP, AVIF, TIFF and raw pixel data output are supported. If no explicit format is set, the output format will match the input image, except GI","k":"tobuffer write output buffer jpeg png webp avif tiff raw pixel data explicit format match input except","l":"/api-output#tobuffer"},{"t":"withMetadata","d":"Include all metadata EXIF, XMP, IPTC from the input image in the output image. This will also convert to and add a web-friendly sRGB ICC profile unless a custom output profile is p","k":"withmetadata include metadata exif xmp iptc input output convert add web friendly srgb icc profile custom orientation density","l":"/api-output#withmetadata"},{"t":"toFormat","d":"Force output to a given format.","k":"toformat force output format","l":"/api-output#toformat"},{"t":"jpeg","d":"Use these JPEG options for output image.","k":"jpeg output quality progressive optimisecoding optimizecoding mozjpeg optimisescans optimizescans force","l":"/api-output#jpeg"},{"t":"png","d":"Use these PNG options for output image. By default, PNG output is full colour at 8 or 16 bits per pixel. Indexed PNG input at 1, 2 or 4 bits per pixel is converted to 8 bits per pi","k":"png output full colour bits per pixel indexed input converted progressive palette quality colours colors dither force","l":"/api-output#png"},{"t":"webp","d":"Use these WebP options for output image.","k":"webp output quality alphaquality lossless nearlossless smartsubsample pageheight loop delay force","l":"/api-output#webp"},{"t":"gif","d":"Use these GIF options for output image. Requires libvips compiled with support for ImageMagick or GraphicsMagick. The prebuilt binaries do not include this - see installing a custo","k":"gif output requires libvips compiled imagemagick graphicsmagick prebuilt binaries include installing custo pageheight loop delay force","l":"/api-output#gif"},{"t":"avif","d":"Use these AVIF options for output image. Whilst it is possible to create AVIF images smaller than 16x16 pixels, most web browsers do not display these properly.","k":"avif output whilst possible create images smaller than pixels web browsers display properly quality lossless speed","l":"/api-output#avif"},{"t":"raw","d":"Force output to be raw, uncompressed, 8-bit unsigned integer unit8 pixel data. Pixel ordering is left-to-right, top-to-bottom, without padding. Channel ordering will be RGB or RGBA","k":"raw force output uncompressed bit unsigned integer unit pixel data ordering left right top bottom padding channel rgb rgba size overlap angle background depth skipblanks container layout centre center","l":"/api-output#raw"},{"t":"resize","d":"Resize image to width, height or width x height. When both a width and height are provided, the possible methods by which the image should fit these are cover default Preserving as","k":"resize width height possible methods fit cover preserving position background kernel","l":"/api-resize#resize"},{"t":"extend","d":"Extends/pads the edges of the image with the provided background colour. This operation will always occur after resizing and extraction, if any.","k":"extend extends pads edges background colour operation resizing extraction","l":"/api-resize#extend"},{"t":"extract","d":"Extract/crop a region of the image. Use extract before resize for pre-resize extraction. Use extract after resize for post-resize extraction. Use extract before and after for both.","k":"extract crop region resize pre extraction post left top width height","l":"/api-resize#extract"},{"t":"trim","d":"Trim boring pixels from all edges that contain values similar to the top-left pixel. Images consisting entirely of a single colour will calculate boring using the alpha channel, if","k":"trim boring pixels edges contain similar top left pixel images consisting entirely single colour calculate alpha channel","l":"/api-resize#trim"},{"t":"composite","d":"Composite images over the processed resized, extracted etc. image. The images to composite must be the same size or smaller than the processed image. If both top and left options a","k":"composite images processed resized extracted size smaller than top left","l":"/api-composite#composite"},{"t":"rotate","d":"Rotate the output image by either an explicit angle or auto-orient based on the EXIF Orientation tag. If an angle is provided, it is converted to a valid positive degree rotation.","k":"rotate output explicit angle auto orient exif orientation tag converted valid positive degree rotation background","l":"/api-operation#rotate"},{"t":"flip","d":"Flip the image about the vertical Y axis. This always occurs after rotation, if any. The use of flip implies the removal of the EXIF Orientation tag, if any.","k":"flip vertical axis rotation implies removal exif orientation tag","l":"/api-operation#flip"},{"t":"affine","d":"Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any. You must provide an array of length 4 or a 2x2 affine tra","k":"affine transform operation resizing extraction rotation array length tra background","l":"/api-operation#affine"},{"t":"sharpen","d":"Sharpen the image. When used without parameters, performs a fast, mild sharpen of the output image. When a sigma is provided, performs a slower, more accurate sharpen of the L chan","k":"sharpen parameters fast mild output sigma slower accurate chan","l":"/api-operation#sharpen"},{"t":"blur","d":"Blur the image. When used without parameters, performs a fast, mild blur of the output image. When a sigma is provided, performs a slower, more accurate Gaussian blur.","k":"blur parameters fast mild output sigma slower accurate gaussian","l":"/api-operation#blur"},{"t":"gamma","d":"Apply a gamma correction by reducing the encoding darken pre-resize at a factor of 1/gamma then increasing the encoding brighten post-resize at a factor of gamma. This can improve","k":"gamma apply correction reducing encoding darken pre resize factor then increasing brighten post improve","l":"/api-operation#gamma"},{"t":"normalise","d":"Enhance output image contrast by stretching its luminance to cover the full dynamic range.","k":"normalise enhance output contrast stretching luminance cover full dynamic range","l":"/api-operation#normalise"},{"t":"clahe","d":"Perform contrast limiting adaptive histogram equalization CLAHE9. This will, in general, enhance the clarity of the image by bringing out darker details.","k":"clahe contrast limiting adaptive histogram equalization general enhance clarity bringing out darker details width height maxslope","l":"/api-operation#clahe"},{"t":"threshold","d":"Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.","k":"threshold pixel greater than equal otherwise greyscale grayscale","l":"/api-operation#threshold"},{"t":"linear","d":"Apply the linear formula a input b to the image levels adjustment","k":"linear apply formula input levels adjustment","l":"/api-operation#linear"},{"t":"modulate","d":"Transforms the image using brightness, saturation and hue rotation.","k":"modulate transforms brightness saturation hue rotation","l":"/api-operation#modulate"},{"t":"removeAlpha","d":"Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel. See also flatten1.","k":"removealpha remove alpha channel flatten","l":"/api-channel#removealpha"},{"t":"extractChannel","d":"Extract a single channel from a multi-channel image.","k":"extractchannel extract single channel multi","l":"/api-channel#extractchannel"},{"t":"joinChannel","d":"Join one or more channels to the image. The meaning of the added channels depends on the output colourspace, set with toColourspace. By default the output image will be web-friendl","k":"joinchannel join one channels meaning added depends output colourspace tocolourspace web friendl","l":"/api-channel#joinchannel"},{"t":"tint","d":"Tint the image using the provided chroma while preserving the image luminance. An alpha channel may be present and will be unchanged by the operation.","k":"tint chroma preserving luminance alpha channel present unchanged operation","l":"/api-colour#tint"},{"t":"grayscale","d":"Alternative spelling of greyscale.","k":"grayscale greyscale","l":"/api-colour#grayscale"},{"t":"toColorspace","d":"Alternative spelling of toColourspace.","k":"tocolorspace tocolourspace","l":"/api-colour#tocolorspace"},{"t":"format","d":"An Object containing nested boolean values representing the available input and output formats/methods.","k":"format object nested boolean representing available input output formats methods memory files items","l":"/api-utility#format"},{"t":"concurrency","d":"Gets or, when a concurrency is provided, sets the number of threads libvips should create to process each image. The default value is the number of CPU cores, except when using gli","k":"concurrency number threads libvips create process cpu cores except gli","l":"/api-utility#concurrency"},{"t":"queue","d":"An EventEmitter that emits a change event when a task is either queued, waiting for libuv to provide a worker thread complete","k":"queue eventemitter emits change event task queued waiting libuv worker thread complete","l":"/api-utility#queue"}]
\ No newline at end of file
+[{"t":"Prerequisites","d":"Node.js v10","k":"prerequisites node","l":"/install#prerequisites"},{"t":"Prebuilt binaries","d":"Ready-compiled sharp and libvips binaries are provided for use with Node.js v10 on the most common platforms macOS x64 10.13 Linux x64 glibc 2.17, musl 1.1.24 Linux ARM64 glibc 2.2","k":"prebuilt binaries compiled sharp libvips node common platforms macos linux glibc musl arm","l":"/install#prebuilt-binaries"},{"t":"Common problems","d":"The architecture and platform of Node.js used for npm install must be the same as the architecture and platform of Node.js used at runtime. See the cross-platform","k":"common problems architecture platform node npm install runtime cross","l":"/install#common-problems"},{"t":"Apple M1","d":"Prebuilt libvips binaries are provided for macOS on ARM64 since sharp v0.28.0. During npm install sharp will be built locally, which requires Xcode and Python - see building from s","k":"apple prebuilt libvips binaries macos arm sharp during npm install built locally xcode python building","l":"/install#apple-m1"},{"t":"Custom libvips","d":"To use a custom, globally-installed version of libvips instead of the provided binaries, make sure it is at least the version listed under config.libvips in the package.json file a","k":"custom libvips globally installed version instead binaries make listed config package json file","l":"/install#custom-libvips"},{"t":"Building from source","d":"This module will be compiled from source at npm install time when a globally-installed libvips is detected set the SHARP_IGNORE_GLOBAL_LIBVIPS environment variable to skip this, pr","k":"building source module compiled npm install time globally installed libvips detected environment variable skip","l":"/install#building-from-source"},{"t":"Custom prebuilt binaries","d":"This is an advanced approach that most people will not require. To install the prebuilt sharp binaries from a custom URL, set the sharp_binary_host npm config option or the npm_con","k":"custom prebuilt binaries advanced approach people require install sharp url npm config option npmcon","l":"/install#custom-prebuilt-binaries"},{"t":"Chinese mirror","d":"A mirror site based in China, provided by Alibaba, contains binaries for both sharp and libvips. To use this either set the following configuration sh npm config set sharp_binary_h","k":"chinese mirror site china alibaba contains binaries sharp libvips following configuration npm config sharpbinaryh","l":"/install#chinese-mirror"},{"t":"FreeBSD","d":"The vips package must be installed before npm install is run. sh pkg install -y pkgconf vips sh cd /usr/ports/graphics/vips/ make install clean","k":"freebsd vips package installed npm install run pkg pkgconf usr ports graphics make clean","l":"/install#freebsd"},{"t":"Linux memory allocator","d":"The default memory allocator on most glibc-based Linux systems e.g. Debian, Red Hat is unsuitable for long-running, multi-threaded processes that involve lots of small memory alloc","k":"linux memory allocator glibc systems debian red hat unsuitable long running multi threaded processes small alloc","l":"/install#linux-memory-allocator"},{"t":"Heroku","d":"Add the jemalloc buildpack to reduce the effects of memory fragmentation. Set NODE_MODULES_CACHE","k":"heroku add jemalloc buildpack reduce effects memory fragmentation","l":"/install#heroku"},{"t":"AWS Lambda","d":"The binaries in the node_modules directory of the deployment package must be for the Linux x64 platform. When building your deployment package on machines other than Linux x64 glib","k":"aws lambda binaries nodemodules directory deployment package linux platform building your machines glib","l":"/install#aws-lambda"},{"t":"Webpack","d":"Ensure sharp is added to the externals configuration. js externals sharp commonjs sharp","k":"webpack sharp added externals configuration commonjs","l":"/install#webpack"},{"t":"Worker threads","d":"The main thread must call requiresharp before worker threads are created to ensure shared libraries remain loaded in memory until after all threads are complete.","k":"worker threads main thread requiresharp created shared libraries remain loaded memory complete","l":"/install#worker-threads"},{"t":"Canvas and Windows","d":"The prebuilt binaries provided by canvas for Windows depend on the unmaintained GTK 2, last updated in 2011. These conflict with the modern, up-to-date binaries provided by sharp.","k":"canvas windows prebuilt binaries depend unmaintained gtk last updated conflict modern date sharp","l":"/install#canvas-and-windows"},{"t":"Sharp","d":"Constructor factory to create an instance of sharp, to which further methods are chained.","k":"sharp constructor factory create instance further methods chained","l":"/api-constructor#sharp"},{"t":"clone","d":"Take a snapshot of the Sharp instance, returning a new instance. Cloned instances inherit the input of their parent instance. This allows multiple output Streams and therefore mult","k":"clone snapshot sharp instance returning new cloned instances inherit input parent multiple output streams mult","l":"/api-constructor#clone"},{"t":"metadata","d":"Fast access to uncached image metadata without decoding any compressed image data. A Promise is returned when callback is not provided.","k":"metadata fast access uncached decoding compressed data promise","l":"/api-input#metadata"},{"t":"stats","d":"Access to pixel-derived image statistics for every channel in the image. A Promise is returned when callback is not provided.","k":"stats access pixel derived statistics channel promise","l":"/api-input#stats"},{"t":"toFile","d":"Write output image data to a file.","k":"tofile write output data file","l":"/api-output#tofile"},{"t":"toBuffer","d":"Write output to a Buffer. JPEG, PNG, WebP, AVIF, TIFF and raw pixel data output are supported.","k":"tobuffer write output buffer jpeg png webp avif tiff raw pixel data","l":"/api-output#tobuffer"},{"t":"withMetadata","d":"Include all metadata EXIF, XMP, IPTC from the input image in the output image. This will also convert to and add a web-friendly sRGB ICC profile unless a custom output profile is p","k":"withmetadata include metadata exif xmp iptc input output convert add web friendly srgb icc profile custom","l":"/api-output#withmetadata"},{"t":"toFormat","d":"Force output to a given format.","k":"toformat force output format","l":"/api-output#toformat"},{"t":"jpeg","d":"Use these JPEG options for output image.","k":"jpeg output quality progressive optimisecoding optimizecoding mozjpeg optimisescans optimizescans force","l":"/api-output#jpeg"},{"t":"png","d":"Use these PNG options for output image.","k":"png output","l":"/api-output#png"},{"t":"webp","d":"Use these WebP options for output image.","k":"webp output quality alphaquality lossless nearlossless smartsubsample pageheight loop delay force","l":"/api-output#webp"},{"t":"gif","d":"Use these GIF options for output image.","k":"gif output","l":"/api-output#gif"},{"t":"tiff","d":"Use these TIFF options for output image.","k":"tiff output quality force compression predictor pyramid tile tilewidth tileheight xres yres bitdepth","l":"/api-output#tiff"},{"t":"avif","d":"Use these AVIF options for output image.","k":"avif output","l":"/api-output#avif"},{"t":"heif","d":"Use these HEIF options for output image.","k":"heif output","l":"/api-output#heif"},{"t":"raw","d":"Force output to be raw, uncompressed, 8-bit unsigned integer unit8 pixel data. Pixel ordering is left-to-right, top-to-bottom, without padding. Channel ordering will be RGB or RGBA","k":"raw force output uncompressed bit unsigned integer unit pixel data ordering left right top bottom padding channel rgb rgba","l":"/api-output#raw"},{"t":"tile","d":"Use tile-based deep zoom image pyramid output. Set the format and options for tile images via the toFormat, jpeg, png or webp functions. Use a .zip or .szi file extension with toFi","k":"tile deep zoom pyramid output format images via toformat jpeg png webp functions zip szi file extension tofi","l":"/api-output#tile"},{"t":"resize","d":"Resize image to width, height or width x height.","k":"resize width height","l":"/api-resize#resize"},{"t":"extend","d":"Extends/pads the edges of the image with the provided background colour. This operation will always occur after resizing and extraction, if any.","k":"extend extends pads edges background colour operation resizing extraction","l":"/api-resize#extend"},{"t":"extract","d":"Extract/crop a region of the image.","k":"extract crop region","l":"/api-resize#extract"},{"t":"trim","d":"Trim boring pixels from all edges that contain values similar to the top-left pixel. Images consisting entirely of a single colour will calculate boring using the alpha channel, if","k":"trim boring pixels edges contain similar top left pixel images consisting entirely single colour calculate alpha channel","l":"/api-resize#trim"},{"t":"composite","d":"Composite images over the processed resized, extracted etc. image.","k":"composite images processed resized extracted","l":"/api-composite#composite"},{"t":"rotate","d":"Rotate the output image by either an explicit angle or auto-orient based on the EXIF Orientation tag.","k":"rotate output explicit angle auto orient exif orientation tag","l":"/api-operation#rotate"},{"t":"flip","d":"Flip the image about the vertical Y axis. This always occurs after rotation, if any. The use of flip implies the removal of the EXIF Orientation tag, if any.","k":"flip vertical axis rotation implies removal exif orientation tag","l":"/api-operation#flip"},{"t":"flop","d":"Flop the image about the horizontal X axis. This always occurs after rotation, if any. The use of flop implies the removal of the EXIF Orientation tag, if any.","k":"flop horizontal axis rotation implies removal exif orientation tag","l":"/api-operation#flop"},{"t":"affine","d":"Perform an affine transform on an image. This operation will always occur after resizing, extraction and rotation, if any.","k":"affine transform operation resizing extraction rotation","l":"/api-operation#affine"},{"t":"sharpen","d":"Sharpen the image. When used without parameters, performs a fast, mild sharpen of the output image. When a sigma is provided, performs a slower, more accurate sharpen of the L chan","k":"sharpen parameters fast mild output sigma slower accurate chan","l":"/api-operation#sharpen"},{"t":"median","d":"Apply median filter. When used without parameters the default window is 3x3.","k":"median apply filter parameters window","l":"/api-operation#median"},{"t":"blur","d":"Blur the image. When used without parameters, performs a fast, mild blur of the output image. When a sigma is provided, performs a slower, more accurate Gaussian blur.","k":"blur parameters fast mild output sigma slower accurate gaussian","l":"/api-operation#blur"},{"t":"flatten","d":"Merge alpha transparency channel, if any, with a background, then remove the alpha channel.","k":"flatten merge alpha transparency channel background remove","l":"/api-operation#flatten"},{"t":"gamma","d":"Apply a gamma correction by reducing the encoding darken pre-resize at a factor of 1/gamma then increasing the encoding brighten post-resize at a factor of gamma. This can improve","k":"gamma apply correction reducing encoding darken pre resize factor increasing brighten post improve","l":"/api-operation#gamma"},{"t":"negate","d":"Produce the negative of the image.","k":"negate produce negative","l":"/api-operation#negate"},{"t":"normalise","d":"Enhance output image contrast by stretching its luminance to cover the full dynamic range.","k":"normalise enhance output contrast stretching luminance cover full dynamic range","l":"/api-operation#normalise"},{"t":"normalize","d":"Alternative spelling of normalise.","k":"normalize normalise","l":"/api-operation#normalize"},{"t":"clahe","d":"Perform contrast limiting adaptive histogram equalization CLAHE9.","k":"clahe contrast limiting adaptive histogram equalization","l":"/api-operation#clahe"},{"t":"convolve","d":"Convolve the image with the specified kernel.","k":"convolve specified kernel","l":"/api-operation#convolve"},{"t":"threshold","d":"Any pixel value greater than or equal to the threshold value will be set to 255, otherwise it will be set to 0.","k":"threshold pixel greater equal otherwise greyscale grayscale","l":"/api-operation#threshold"},{"t":"boolean","d":"Perform a bitwise boolean operation with operand image.","k":"boolean bitwise operation operand","l":"/api-operation#boolean"},{"t":"linear","d":"Apply the linear formula a input b to the image levels adjustment","k":"linear apply formula input levels adjustment","l":"/api-operation#linear"},{"t":"recomb","d":"Recomb the image with the specified matrix.","k":"recomb specified matrix","l":"/api-operation#recomb"},{"t":"modulate","d":"Transforms the image using brightness, saturation and hue rotation.","k":"modulate transforms brightness saturation hue rotation","l":"/api-operation#modulate"},{"t":"removeAlpha","d":"Remove alpha channel, if any. This is a no-op if the image does not have an alpha channel.","k":"removealpha remove alpha channel","l":"/api-channel#removealpha"},{"t":"ensureAlpha","d":"Ensure the output image has an alpha transparency channel. If missing, the added alpha channel will have the specified transparency level, defaulting to fully-opaque 1. This is a n","k":"ensurealpha output alpha transparency channel missing added specified level defaulting fully opaque","l":"/api-channel#ensurealpha"},{"t":"extractChannel","d":"Extract a single channel from a multi-channel image.","k":"extractchannel extract single channel multi","l":"/api-channel#extractchannel"},{"t":"joinChannel","d":"Join one or more channels to the image. The meaning of the added channels depends on the output colourspace, set with toColourspace. By default the output image will be web-friendl","k":"joinchannel join one channels meaning added depends output colourspace tocolourspace web friendl","l":"/api-channel#joinchannel"},{"t":"bandbool","d":"Perform a bitwise boolean operation on all input image channels bands to produce a single channel output image.","k":"bandbool bitwise boolean operation input channels bands produce single channel output","l":"/api-channel#bandbool"},{"t":"tint","d":"Tint the image using the provided chroma while preserving the image luminance. An alpha channel may be present and will be unchanged by the operation.","k":"tint chroma preserving luminance alpha channel present unchanged operation","l":"/api-colour#tint"},{"t":"greyscale","d":"Convert to 8-bit greyscale 256 shades of grey. This is a linear operation. If the input image is in a non-linear colour space such as sRGB, use gamma with greyscale for the best re","k":"greyscale convert bit shades grey linear operation input colour space srgb gamma best","l":"/api-colour#greyscale"},{"t":"grayscale","d":"Alternative spelling of greyscale.","k":"grayscale greyscale","l":"/api-colour#grayscale"},{"t":"toColourspace","d":"Set the output colourspace. By default output image will be web-friendly sRGB, with additional channels interpreted as alpha channels.","k":"tocolourspace output colourspace web friendly srgb additional channels interpreted alpha","l":"/api-colour#tocolourspace"},{"t":"toColorspace","d":"Alternative spelling of toColourspace.","k":"tocolorspace tocolourspace","l":"/api-colour#tocolorspace"},{"t":"format","d":"An Object containing nested boolean values representing the available input and output formats/methods.","k":"format object nested boolean representing available input output formats methods","l":"/api-utility#format"},{"t":"interpolators","d":"An Object containing the available interpolators and their proper values","k":"interpolators object available proper","l":"/api-utility#interpolators"},{"t":"versions","d":"An Object containing the version numbers of libvips and its dependencies.","k":"versions object version numbers libvips dependencies","l":"/api-utility#versions"},{"t":"cache","d":"Gets or, when options are provided, sets the limits of libvips operation cache. Existing entries in the cache will be trimmed after any change in limits. This method always returns","k":"cache limits libvips operation existing entries trimmed change method returns memory files items","l":"/api-utility#cache"},{"t":"concurrency","d":"Gets or, when a concurrency is provided, sets the number of threads libvips should create to process each image.","k":"concurrency number threads libvips create process","l":"/api-utility#concurrency"},{"t":"queue","d":"An EventEmitter that emits a change event when a task is either","k":"queue eventemitter emits change event task","l":"/api-utility#queue"},{"t":"counters","d":"Provides access to internal task counters.","k":"counters provides access internal task","l":"/api-utility#counters"},{"t":"simd","d":"Get and set use of SIMD vector unit instructions. Requires libvips to have been compiled with liborc support.","k":"simd vector unit instructions libvips compiled liborc","l":"/api-utility#simd"}]
\ No newline at end of file
diff --git a/docs/search-index/build.js b/docs/search-index/build.js
index 81d058c9e..c07ae3fea 100644
--- a/docs/search-index/build.js
+++ b/docs/search-index/build.js
@@ -37,14 +37,14 @@ for (const match of matches) {
 ].forEach((section) => {
   const contents = fs.readFileSync(path.join(__dirname, '..', `api-${section}.md`), 'utf8');
   const matches = contents.matchAll(
-    /\n## (?<title>[A-Za-z]+)\n\n(?<firstparagraph>.+?)\n\n(?<parameters>### Parameters*.+?)#/gs
+    /\n## (?<title>[A-Za-z]+)\n\n(?<firstparagraph>.+?)\n\n(?<parameters>### Parameters.+?Returns)?/gs
   );
   for (const match of matches) {
     const { title, firstparagraph, parameters } = match.groups;
     const description = firstparagraph.startsWith('###')
       ? 'Constructor'
       : extractDescription(firstparagraph);
-    const parameterNames = extractParameters(parameters);
+    const parameterNames = parameters ? extractParameters(parameters) : '';
 
     searchIndex.push({
       t: title,
diff --git a/docs/search-index/stop-words.js b/docs/search-index/stop-words.js
index 0a777fbce..90fd09f6a 100644
--- a/docs/search-index/stop-words.js
+++ b/docs/search-index/stop-words.js
@@ -17,6 +17,7 @@ module.exports = [
   'before',
   'both',
   'call',
+  'callback',
   'can',
   'containing',
   'default',
@@ -26,6 +27,7 @@ module.exports = [
   'ensure',
   'etc',
   'every',
+  'except',
   'for',
   'from',
   'get',
@@ -49,12 +51,16 @@ module.exports = [
   'occur',
   'occurs',
   'options',
+  'other',
+  'out',
   'over',
   'perform',
   'performs',
   'provide',
   'provided',
   'ready',
+  'requires',
+  'returned',
   'same',
   'see',
   'set',
@@ -67,9 +73,11 @@ module.exports = [
   'supported',
   'sure',
   'take',
+  'than',
   'that',
   'the',
   'their',
+  'then',
   'there',
   'therefore',
   'these',