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Setting DPI of image data

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Setting DPI of image data

Subject: Setting DPI of image data
From: Graham Cox <email@hidden>
Date: Fri, 11 Jul 2008 13:16:02 +1000

I'm using NSBitMapImageRep's -representationUsingType:properties: method to convert data to JPEG, TIFF, etc. I'd like to be able to specify the DPI of the image. I can calculate the right number of pixels needed for a given DPI OK, but the image always comes up as having 72 dpi when opened in another app. Is there a way to set this property at this level, or am I forced to drop down into Image I/O?

I had hoped that the properties passed at this level (such as kCGImagePropertyDPIWidth) would just get passed down to the lower levels, but that doesn't appear to be the case.

tia,

Graham
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