hello, you can set alpha blend type to be the maxinmum of each images. cyrille
Georg Holzmann a écrit : > Hallo! > > I have again a basic alpha blending problem, where I don't find a solution: > > For example I have two images (A + B), which are overlapping at a small > part (C): > > ---------------- > | image A | > | | > | |------------------ > | | C | | > -----------|---- | > | | > | image B | > ------------------- > > Now I want that image A and image B looks normal (unchanged) and in the > overlapping part the two images are added so that one sees both - and > all this with openGL commands (not pix_add or similar, because I have > lots of such regions). > > OK, I gave all images an alpha value of 0.5, but then the whole image > losses brightness. > > So my question: is there a way to get this alpha blending and without a > loss of brightness in the images ? or can I "renormalize" this effect > somehow (re-increase the brightness) ? > (see attached patch where I illustruted this problem with 2 colored > rectangles) > > Thanks for any hint, > LG > Georg > > > ------------------------------------------------------------------------ > > _______________________________________________ > PD-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list _______________________________________________ PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list