gfx_procrect's mysterious 768-entry table

[papagirafe]

Hi dear video processor gurus!

Nowadays I am trying one by one the non-obvious gfx functions and today's winner is gfx_procrect()! Apart from the fact that 768 is 3x256 and that the table seems to be composed of 3 groups 256 0/1 values, I do not know how to populate this table with useful values. It modifies colors but does it also allow to alter the alpha values?

Also the gfx_evalrect() seems to use a similar "table" logic but again the "eval code" is a pure mystery for me.

Thanks in advance!

[Scrumpy Jack]

It modifies colors but does it also allow to alter the alpha values?

(Two years later…) Did you discover the answer to this question? I've been trying to add an alpha knob to girafx:fx/colorize, but I haven't found a mode/settings/formula combination that gets gfx_procrect() to honor it.

Also the gfx_evalrect() seems to use a similar "table" logic but again the "eval code" is a pure mystery for me

"pure mystery" is a great way to put it

[papagirafe]

I had forgotten about this thread! Yes I finally got the answer in some other thread here is the specific post