[PD] pd/gem per-pixel image manipulation

marius schebella marius.schebella at gmail.com
Tue Feb 19 21:23:44 CET 2008

hi martin,
not sure where you want to go with that, but if you want to create 
visuals stuff, you should dive into glsl programming and do your 
manipulations in shader language. this is extremely efficient and fast.
there are examples by cyrille and the pd montreal community (alexandre 
etc). there is also a mailing list (glslang at dataflow.ws).
for your patch it could be a triggerproblem, but difficult to say 
without seeing it.

Martin Leopold Grödl wrote:
> hi everybody, i want to do per pixel image manipulation in gem (running 
> pd.extended 0.39-3).
> so far i've been trying pix_dump with a lister and then until with 
> packel to access individual rgba values in a loop. after i do the 
> manipulations i accumulate them back into a list using repack and send 
> it to pix_set.
> it all works out pretty smooth. only problem is the list that gets sent 
> to pix_set somehow seems to get one float prepended, which effectively 
> shifts all the rgba-values one step and messes up the colors.
> any advice/examples on a correct pix_dump / pix_set setup? ...any other 
> solutions?
> thx,
> martin
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