* oliver <[email protected]> [2017-04-12 14:21]: > hi, dear list ! > > i'm looking for an insight into some questions i ran into recently when i > decided to give GEM a serious shot after all. > please be patient, i'm probably spoiled by JITTER ... > > PD 0.47.1 > GEM 0.93.3 > WINDOWS 7/64bit > > 1.) is there a way to do image processing (i.e. levels, contrast, > satturation etc.) on the GPU ? > > as far as i understood [pix_...] objects do all their processing with the > CPU > and others like [color] do it in openGL (thus GPU), is that right ? > now, for big textures (1280x720 or bigger) that would be the preferable way > of manipulating things, right ? Asking a similar question recently on this list I got told that a lot is possible using shaders. See if you have a folder named 10.glsl on your OS somewhere that could hold Gem examples for shaders.
Searching the mailing list archive https://lists.puredata.info/pipermail/pd-list/ for "shaders" https://lists.puredata.info/search?P=shaders&G=Pd-list&HITSPERPAGE=20&SORT=-1 might give you results as well. > 2.) i'm looking for objects that do "compositing", i.e. ways to overlay two > pix sources. apart from the ones existing (add, multiplay, subtract, mix) , > i would love to have the well-known (AE,vegas, etc.) compositing modes like > "darken", "lighten", "dodge" "difference" etc. - but also chromakeying ! > > is this possible ? and is it possible to do in opengl rather than with a > [pix_] object ? Look for help patches 12.blending.pd 13.maskDancer.pd 14.takeAlpha.pd 15.pix_alpha.pd and the [pix_chroma_key] object and its documentation perhaps. _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list
