CoreImage problems with very large images
CoreImage problems with very large images
- Subject: CoreImage problems with very large images
- From: Jim Crate <email@hidden>
- Date: Fri, 16 Nov 2007 03:07:34 -0500
I'm using CoreImage in an app, but it is unusable with very large
images, e.g. a 52-megabyte 18,000 x 14,000 jpg. A 5000 x 4000 jpg
image loads and processes with great performance, but trying to
process the large image leads to very high memory use and much
swapping to disk. I tried to load the large image in the Core Image
Fun House example app, and ended up force-quitting after waiting 10-15
minutes.
The old implementation using NSImage could load and process (scale,
rotate, watermark, broken grayscale) the large images, and while it
wasn't fast, it was at least usable.
Is CoreImage just not meant to handle images this big? Or are there
ways to gain acceptable performance with these large images with
CoreImage? Will the problem possibly go away on a Mac Pro?
Thanks,
Jim
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