is there a cfml image function which allows changing the colorspace of an image, beyond https://cfdocs.org/imagegrayscale ? as a workaround, I've used writing out to a gif to reduce a 24 bit image to 8 bit, but that's klunky AF

I've been using GraphicsMagick for all image-related functions with ColdFusion since v8. It remains faster, more memory efficient and is compatible with more image formats. (We also use ImageMagick, but only for auto-converting HEIC/HEIF to JPG.)