The 16 colors are obtained by mixing 4 basic colors (black, red, green, blue).
If you want to make these colors brighter, check the function ShowBitmap().
It calls a sub-function “SetPalette(bmpPalette);”
The 4 values of bmpPalette correspond to the first 4 bytes of the image file loaded in LoadBitmap().
You can either hack ShowBitmap to edit the values in the bmpPalette array, of modify the python conversion script to write different values for these 4 bytes.
(see: https://github.com/8bit-Dude/8bit-Unity/blob/main/docs/Palettes/ATARI-Sprites.png)
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This reply was modified 2 years ago by 8bit-Dude.