i feel like this should be easy enough to figure out, but my brain's not working well today...

i'm using texture() to paint an image to a plane, and i'd like to desaturate the texture in some areas.  tint() seems to be the way to go, but i can't figure out how to desaturate using only tint().

i have r,g,b vals of the texture image at each vertex, so can use them if needed....any suggestions?  thanks!

mm, but there's no way that would be performant on the scale of an entire texture (mine is 320x240, applied over many polys to a 1200x900 area)...unless i'm missing something?

a bit hard to explain, but i'm trying to modify textures in certain areas depending on...things.  basic example -- the camera Capture is applied as a texture to a mesh made with vertex() calls.  areas with more motion/change in the Capture image have more saturated color; areas with less 'fade' into less saturation.

end result is color where motion happens, b/w where things are still.

i might be able to do just what you said, actually -- essentially texture the mesh twice, and use tint() to fade one into the other...however i think that would make the program run almost twice as slow

k thx cedric.  wil report back if i can figure anything out.

depth wrote on Feb 23^rd, 2010, 10:21am:

Don't think, try! Suppositions about performances can be surprisingly wrong...
Don't forget that stuff done by Processing need some work too, there is no magic. Some operations behind Processing functions are just done by iterating on the pixel array...