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Does anyone have any ideas how I can find the grey scale equivalent of a colour?
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(R + G + B) / 3
Palette prefs sets the first four and the last four pens of the screen. So if your screen has a depth of eight colours, you can define all eight pens. But if your screen has more colours, pens 4 - 7 are random.
If you don't want to dictate the screen's palette, then you should stick with
0 = background / transparent
1 = black
2 = white
3 = some color