Red/Green/Blue/GrayScale images

[RhoSigma]

Library Collection -> IMG-Support -> imageprocess.bm -> functions MakeGrayscale, ExtractChannels, ExtractBitfields, ShiftRGB can do same and/or similar things, but still keep it 32-bit colors.

Also your grayscale seems not to take the human color perception into account (red * 0.299, green * 0.587, blue * 0.114).