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GIF rotation/orientation with colorAtX:y:

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GIF rotation/orientation with colorAtX:y:

Subject: GIF rotation/orientation with colorAtX:y:
From: Jonathan Gillaspie <email@hidden>
Date: Tue, 22 May 2007 10:19:19 -0600


I'm having a problem trying to use colorAtX:y:,

It's working mostly for all files that I would expect NSBitmapImageRep to read but if I load certain GIF images and use that method my data comes out incorrectly.

The NSBitmapImageRep correctly reports the image size, but with one image the image data obtained by using the colorAt method is rotated 90". In another the data is rotated 90" _AND_ mirrored, in other GIF images it's just fine.

Since a picture is worth a thousand words, here are the images and small screenshots that illustrate what I'm talking about: http://www.redstonesoftware.com/support/ColorAtProblem.zip

Any ideas? I'm looking for a flag that indicates orientation that I should be paying attention to but I don't see it anywhere.

--
Jonathan Gillaspie
http://www.redstonesoftware.com
Makers of Platform Independent Automation Software

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