On Aug 14, 2012, at 9:58 PM, Marco S Hyman <m...@snafu.org> wrote:

> The images are typically 25 MB Canon 7D raw image files that have
> been pre-alloc'ed and initWithContentsOfFile: 

NSImage doesn't actually load the image pixels until it needs to. Merely 
initializing an instance won't do it.

That said, NSImage has changed a lot over time (especially its caching) and I'm 
not sure what the best way is to preload an image these days.

—Jens

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