Re: Determining if images are roughly equal
Re: Determining if images are roughly equal
- Subject: Re: Determining if images are roughly equal
- From: "John C. Randolph" <email@hidden>
- Date: Mon, 3 Feb 2003 13:38:38 -0800
I think I should mention that Image Difference only presents a *visual*
representation of the difference between images. What I had in mind
was to see how much was lost between versions of an image that had
varying levels of compression. There's no code in there to quantify
that difference (like the way that DVD encoders do the
sum-of-absolute-difference thing.)
-jcr
On Saturday, February 1, 2003, at 08:58 AM, Joe Osborn wrote:
Apple recently posted sources to ImageDifference, a tool for
subtracting images from each other-- here's a link:
http://developer.apple.com/samplecode/Sample_Code/Graphics_2D/
Image_Difference.htm
It's handy, I'm gonna use it for something soon, too.
Can someone suggest a method for roughly comparing NSImages? I am
creating a disk caching mechanism for my app, and I need a way to
check if an image downloaded from the web (could be in any format) is
equal to an NSImage I've created from a PNG on disk.
...
-Jan Van Tol
--joie
"If you are new to Vi and Vim, using 'nocompatible' is strongly
recommended, because Vi has a lot of unexpected side effects, which
are avoided by this setting." -- Vim manual
John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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