Thanks, It works. Seems it uses ARGB instead of RGBA. I used *kCGImageAlphaNoneSkipLast,* which consumes more memory and all the images are colored as copied images.
Thank you Peng On Tue, Jan 28, 2014 at 4:10 PM, David Duncan <david.dun...@apple.com>wrote: > > On Jan 28, 2014, at 12:37 PM, Peng Gu <pan...@gmail.com> wrote: > > kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little > > > You just asked Core Graphics to make a context with alpha, and thus an > image with alpha. Core Animation doesn’t enumerate all the pixels of the > image to determine if there is alpha, it just looks at the image flags. > > If you don’t want alpha, use kCGImageAlphaNoneSkipFirst instead. > -- > David Duncan > > _______________________________________________ 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
