Hello,

i want to make a midi controlled slide show patch, in the way that by sending a midi note message to the pach, a new image is loaded from harddisk and a crossfade (with controllable crossfade time) is done between this and the previous image. The midi note comes from an audio sequencer (Ableton Live) that also triggers the corresponding sound.

Is it possible to crossfade two images with GEM?
If yes - how?

Thanks
Hannes

Interesting. The answer is definitely yes. But I don't know how.
But these chaps probably do,
irc.freenode.net #dataflow

Hi, to make a crossfade between two images you need to add an alpha channel to the rgb stream with [alpha] and after you can set the alpha (transparency) value with the fifth inlet of [colorRGB],
see attached patch for a brief exemple.

http://www.pdpatchrepo.info/hurleur/Pix_Fade.pd

Thank you very much, i think that is exactly what i need.

just one little problem: in your patch there is the prepend object which uses the iem_prepend_kernel object. i don't have this object even if i have installed the pdext0384 distribution (which includes the iemLib). Where can i find the iem_prepend_kernel object?