<https://forums.atariage.com/topic/349547-320-mode-colours-question/page/3/#comment-5293359>
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"I've really found this to be true. I straddle both worlds and I have been struggling with using GIMP to make 320C graphics.\n \n\n\n\t \n \n\n\n\tIt might really be simpler to programmatically define the graphics in an array rather than using an image editor. I remember doing this on graph paper for the Commodore VIC-20 and 64 back in the day. \n \n\n\n\t \n \n\n\n\tThe biggest thing for me is trying to adapt the graphics into something that the 7800 will use in 160B, 320B, and especially 320C modes and getting the palettes applied properly. I have read through the spreadsheet that has so thoughtfully been pulled together and shared with everyone, and I see exactly how the structure works. But, getting the graphics in GIMP translated into that has been the catch for me.\n \n\n\n\t(Not my graphic, but a reminder of how I used to do things)\n \n\n\n\t\n \n"
<https://forums.atariage.com/topic/349547-320-mode-colours-question/page/3/>