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cscale - scale the rgb colors of an image
cscale inimage outimage.rgb
r g b [-d]
cscale can be used to color balance an image by scaling
the r, g, and b channels by different factors. Each scale factor is an integer
in the range 0 to 255. A scale factor of 0 is interpreted to mean scale
by 0.0, while a scale factor of 255 means scale by 1.0. Each scale factor
multiplies a color channel of the source image. If the -d option is given,
the input colors are divided by the given factors.
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