stumpy_gif

Interface

• StumpyGIF.write(frames : Array(Canvas), path, delay_between_frames = 10) saves a list of frames (canvasses) as a GIF image file, delay_between_frames is in 1/100 of a second
• Canvas and RGBA from stumpy_core

Usage

Writing

require "stumpy_gif"
include StumpyGIF

frames = [] of Canvas

(0..5).each do |z|
  canvas = Canvas.new(256, 256)

  (0..255).each do |x|
    (0..255).each do |y|
      color = RGBA.from_rgb_n([x, y, z * 51], 8)
      canvas[x, y] = color
    end
  end

  frames << canvas
end

StumpyGIF.write(frames, "rainbow.gif")

Left to right: Websafe, median split, NeuQuant

(See examples/ for more examples)

Color Quantization Methods

• Use Websafe colors
• Median Split
• NeuQuant

References

• Kohonen Neural Networks for Optimal Colour Quantization