On Aug 26, 2013, at 11:49 AM, Graham Cox <graham....@bigpond.com> wrote:
> I have a question about extracting embedded bitmap images. When I encounter > an XObject stream with subType /Image, I get a bunch of parameters that looks > pretty close to the parameters to CGImageCreate. However, the 'Filter' > parameter indicates /FlateDecode so I'm assuming that I can't just wrap the > stream in a CFDataRef and then in a CFDataProvider - I'll need to actually > decompress this data first using (according to PDF spec) zlib/deflate. I can't answer your actual question, but I can tell you that going the other way, take a bitmap, feed it through the zlib library, write it into the stream works. But watch out for the "predictor" value--if that's there, it means the stream is deltas instead of pixel values. -- Scott Ribe scott_r...@elevated-dev.com http://www.elevated-dev.com/ (303) 722-0567 voice _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
