Can't you divide 256 by 100 to get the right value then?
Well, it's totally possible by getting the closest color from the colorset. It will NOT be exact since RGBA has 1000^4 colors and colorsets have 64 colors.
No, you'd need to change the colorset which isn't possible at runtime. You'd have to get the closest color from the colorset and paint that brick said color.
... technically RGBA has unlimited colors, but usually you give each channel 256, so it's actually 2564.
Since the colorset colors are 0.000-1.000, you technically have 1000 colors to pick from.
Oh, I see. Don't you mean 0-255 though?