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NSBitmapImageRep getPixel and color Spaces

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NSBitmapImageRep getPixel and color Spaces

Subject: NSBitmapImageRep getPixel and color Spaces
From: Daniel Vollmer <email@hidden>
Date: Thu, 2 Mar 2006 01:06:35 +0100

Hi all,

I am using an NSBitmapImageRep's getPixel:atX:y: method to access the pixel data of an image, but when I create an NSImage (and a corresponding NSBitmapImageRep) from the raw data and display it, the gamma-curve (for a grayscale image) looks slightly different then when I am displaying the image in Preview.app. Is the data returned by getPixel color-corrected? Or maybe there is a difference between [NSBitmapImageReg initWithData:] and what Preview.app uses (probably NSImage)?

For reference, the file I am using for testing is a grayscale PNG image with 8bpp and the info panel displays the color-space as "Calibrated Gray Colorspace", the created NSBitmapImageRep which I fill with data and display is using NSCalibratedWhiteColorSpace.

Any ideas?

Thanks,
	Daniel Vollmer.
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