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Being able to apply new colors to existing images is incredibly useful for allowing rapid creation of color variants. The easiest way to do this is via a "Gradient Map", where existing value ranges are mapped onto new ranges. The easiest way to do *that* is based on mapping a single-dimension scale (like grayscale) of the original image, with positions along the 0-1 intensity scale that map onto colors. Finally, the easiest way to do *that* is with a linear mapping. This feature can grow over time, but the base version would still be very useful. The ideal outcome is that we can: + Have a collection of base, grayscale images. + Have a simple file describing the gradient map(s). + Create new images for each gradient map. + All of the above with a simple CLI command.
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