Re: Speed up image display for large raw images?
Re: Speed up image display for large raw images?
- Subject: Re: Speed up image display for large raw images?
- From: Marco S Hyman <email@hidden>
- Date: Wed, 15 Aug 2012 20:41:51 -0700
On Aug 15, 2012, at 8:24 PM, Jens Alfke <email@hidden> 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 matches what I'm seeing. The code didn't originally
alloc and init the image until just prior to dropping it in
the image well. I tried a pre alloc/init on the off chance it
would make things faster. Nope.
> 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.
For this application the camera preview jpg inside of the raw image
would be of good enough quality. I'm looking at what it would take
to extract that.
Marc
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