Any color correction can be expressed as a color look-up table (CLUT); a mechanism used in image processing to transform a range of input colors into output colors. There are 16,777,216 colors available in the standard RGB color space. One way of representing this data is to create an image containing 4096 x 4096 pixels — when arranged in a specific way, this image is called a Hald CLUT (see "Identity" for normal vision below). Hald CLUTs are supported by
ImageMagick, and
GraphicsMagick. Other possible uses would be to offload the data onto an
FPGA or an
ICC profile, thereby filtering the entire display.
The following images were created using Photoshop's
PixelBender plugin and the
Color Vision Library. Google Chrome, and Safari were both fast enough to process this data without timing out, unfortunately, they don't allow right-click to save the <canvas> as a PNG.
Identity
Normal Vision
Protanopia
Simulate missing red-cone
Daltonize missing red-cone
Deuteranopia
Simulate missing green-cone
Daltonize missing green-cone
Tritanopia
Simulate missing blue-cone
Daltonize missing blue-cone
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