Roughly speaking, you can calculate a colored pixel's effective luminance by:
Y = 0.3*R+0.59*G+0.11*B Just set R, G and B to Y, or use a single channel image with the Y values. If python were Matlab (Which I hate, but it's good at this kind of thing...) you could do that in "one step." Who knows, maybe there's a built-in filter you can use to accomplish this anyway, but that's not my territory. - Eben On 11/1/07, Erik Blankinship <[EMAIL PROTECTED]> wrote: > Anyone know of an easy technique for turning a pixbuf or cairo context into > grayscale? > > (& telling me to put the xo into grayscale mode isn't the right answer :-) ) > > _______________________________________________ > Sugar mailing list > [email protected] > http://lists.laptop.org/listinfo/sugar > > _______________________________________________ Sugar mailing list [email protected] http://lists.laptop.org/listinfo/sugar
