Can't open files without downsampling first, why is that?

Hey all,
I have found an issue that I don't know if it is already known or just me.
When I open a .jpg out of a Lumix DMC-TZ5 at full resolution (180ppi at 14.4" height by 19.2" wide) in PSCS5 on a Mac OSX 10.6.5 and then launch Pixel Bender, the image is all multi colored blocks, the same thing that usually means a corrupt file or messed up image. But, if I downsize the image in PSCS5 to 150ppi and leave the other image size settings as they were, then it goes right into Pixel Bender and works just fine.
I am doing this on a 24" iMac 2.8ghz Core Two Duo with 8 gigs of ram if that matters... is anyone else seeing this on files in PB?
I have also tried it on a .nef file out of a Nikon D3 that when opens in PSCS5 is 300ppi and 14.147" wide x 9.44" high, same thing. All broken up digital code looking mess in PB until I find some magic down sampled size.
thanks,
c

I'm not sure which GPU is in your iMac, but it sounds like it is a bit of an older model.
This bug sounds a lot like an issue where the image is taking up a lot of the memory on your graphics card, which can cause noise or garbage in the image when it is drawn to the screen. This is a pretty well known problem on GPUs (one of the reasons why we used to restrict the image sizes a lot more than we do now). This would explain why downsampling the image fixes the problem. For now, you may need to switch to CPU mode to work on your larger images.
Sorry I don't have a better answer for you right now. We're working on getting rid of the image size limitations, but for the moment we have to work with the hardware that is on your machine.

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Can't open files without downsampling first, why is that?

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