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Low level PNG image manipulation

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Low level PNG image manipulation

Subject: Low level PNG image manipulation
From: Andrew Ebling <email@hidden>
Date: Sat, 8 Dec 2007 08:16:42 +0000

I'm writing my first serious/hopefully useful Cocoa application which manipulates PNG images, reducing the number of colours used and paletising the image to reduce the file size.

In order to do this, I'll need to manipulate the PNG image file at a fairly low level and I'm wondering what the best approach would be. I've been searching the Developer Documentation for information on using the PNG file format, but not found anything that looks useful.

Does anyone know if there is anything in the Cocoa API that would help me do this? All I've found so far is CGImageProperties- >kCGImagePropertyIsIndexed.

Or should I just revert to using libpng/zlib which are both open source libraries written in C?

thanks,

Andrew
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