Why are the images in the FITS files monochromatic?
The GIF files are color-mapped, but the FITS standard does not have an equivalent color convention. We could have produced three images (R,B,G) with the mapped values, but the standard display packages are not designed to handle composites. So the g2f task computes the weighted sum of the brightness in each color dimension, and uses that to construct a monochromatic gray-scale image.
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