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Offset Contents

0     palette entry
4     word containing size of extension data
8     type of extension data
12+     extension data
Descriptor extension types
Type     Meaning

0     RGB data (16 bytes of extension data)
     +12 = red value
     +16 = green value
     +20 = blue value

1     CMYK data (20 bytes of extension data)
     +12 = cyan value
     +16 = magenta value
     +20 = yellow value
     +24 = key value

2     HSV data (16 bytes of extension data)
     +12 = hue angle
     +16 = saturation percentage
     +20 = value percentage

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