Question as in the topic title.

Max/Jitter can do [jit.unpack 4] and then you get separate alpha, red, green, blue matrices (each one grayscale).

Gem can do...? Or not do...?

hjh

@ddw_music [pix_colormatrix] will pass just one colour or a combination set by a 4x4 matrix, and then [pix_grey] will convert the output to greyscale, but you will need to use it 4 times (one for each colour + alpha).
David.

@whale-av said:

@ddw_music [pix_colormatrix] will pass just one colour or a combination set by a 4x4 matrix...

Oh right... Thanks. It's been awhile. IIRC it would also need pix_separator to avoid clobbering the original image.

hjh