[PD] pix_invert for livevideo?

hi, i'm trying to invert a live video signal on OSX 10.4.10, G4 1.67
like this:

gemhead | pix_video | pix_invert | pix_texture | rectangle 4 3

but it only processes the upper half image, the lower half stays normal is there a solution or another way to invert a live video signal in gem?

thank you, emanuel

p.s.: i only found this unanswered mail from 2003 in the archives:

[PD] Gem - pix_invert - only bottom 1/3 of image gets processed! robcanning rscanning at eircom.net Fri Nov 28 18:55:39 CET 2003

Hello,

while i am at it - bombarding the list with my problems - here is another one! sorry:-)

in XP with the latest stable PD and Gem if i use: pix_video_ds > pix_invert > pix_texture2 > square 4 for example, only the bottom third of the my webcam feed gets processed by pix_invert in the gem window. I don't have this problem in OSX with the same patch (but using pix_video instead of pix_video_ds) Anybody got and ideas why this is happening?

Thanks, Rob