Tiny-Pixels Engine

A C++ graphics compositing library.

See docs.md for documentation

What Tiny-Pixels can do

To-do

• Color
  • Invert
  • Histogram
    • Read on histogram equalization for new techniques of adjustment
  • Hue correct
  • Tonal correction
  • Color balance (lift, gamma, gain)
  • Saturation
  • Exposure
  • Gamma
  • HSV adjustments
  • RGB curves
    • Catmull-Rom spline
    • Eyedropper for black, white, gray levels
  • Tone map
  • White balance
    • Eyedropper
  • False color
  • Mixing options
    • Alpha over
    • Separate colors (RGBA channels)
    • Combine colors (RGBA channels)
    • Color ramp
      • Constant
      • Linear
      • Bézier
      • B-Spline
        • Read on De Boor's for possible optimization
• Filtering
  • Color reduce
    • 3-bit color
    • 3-bit Floyd-Steinberg error diffusion
    • 8-bit color
    • 8-bit Floyd-Steinberg error diffusion
    • 16-bit color
    • 16-bit Floyd-Steinberg error diffusion
    • 8/16-bit color quantization
  • Blur
    • Box
    • Gaussian
    • Bokeh
  • Anti-aliasing
  • Masking
  • Vignette
  • Color matrix
• Transform
  • Rotate
  • Scale
    • Nearest
    • Bilinear
    • Bicubic
    • Fourier
    • Edge
    • HQX
    • Mipmap
  • Translate
  • Crop
  • Flip
  • Lens distortion
• Misc.
  • Frame
  • Text overlay
  • Procedural texture generation
    • White noise
    • (Improved) Perlin noise
    • Brick
    • Gradient
    • Musgrave
    • Simplex noise
    • Voronoi
    • Wave
• Drawing
  • Lines (unuseful)
  • Rectangles
    • Support percentage of image
  • Ellipse
• Documentation (on-going)

High Priority Enhancements/Bug Fixes

• Color ramp linear and b-spline interpolation shows weird red when using monotone control points
• Replace interpolation in code with dedicated function from Interpolation class
• Bilinear scaling (Image::preview_color_ramp then scale to a large image via Image::f_scale with TwoDimInterp::Biliea as interpolation method
• Refactor Adjustment, Color and Font from image.h

Medium Priority Enhancements/Bug Fixes

• Standardize Color class function design
• Optimize memory for Image::perlin_noise (overuse of array memory for gradient vectors)
• Different interpolation methods for each channel for RGB curves
• Show area instead of line in RGB curve preview
• Show control points in RGB curve preview
• Single channel image support for rgb curves
• Merge preview of RGB curves to one image
• Replace retrieving and setting data with dedicated get and set functions from Image class
• Test Color::apply_adj_rgb thoroughly for hue, saturation, value, lift, gamma, gain
• Support separated channel images in Image::HSV
• Color class HSV integration
• Demo images in README.md
• Ensure uniformity of logic when using data from another image (first channel vs. average grayscale vs. separated channel image)
• Unnecessary memory use/leaks
• Rename enum to generalize for 1-D and 2-D interpolation methods

Low Priority Enhancements/Bug Fixes

• Clean up code in Image::false_color function
• Use uint_t and size_t where necessary
• Edge bleeding in edge detection via Image::edge() function due to Fast Fourier transform limitations
• Sobel edge detection gradient for single channel images
• Make makefile build/run more efficient
• Refactor src/ and move library files into src/lib/