Quote:
dividing by 17 does work but I just dont think these colours exist within the OCS palette.
So the picture cant be converted but a similar picture only.
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That's right, the exact same colors are often not possible with the OCS palette. OCS only has 16 different values for each color component (Red, Green and Blue), and each component has a range between 0 to 15. AGA and RGB color components have 256 different values, ranging between 0 to 255.
So you just have to choose the closest color, and if it doesn't look good, then re-design the image palette for OCS.