On Mon, Oct 12, 2009 at 4:36 AM, Peter C <[email protected]> wrote:
> I just stumble into a feature (or a bug ?), NSImage TIFFRepresentation > produce RGB TIFF with a layer (when open under Photoshop). Previously it > produce plain RGB TIFF under OS 10.5 and below. This cause some part of my > programs interpret wrong RGB data, expecting 3 bytes instead of 4 bytes for > a RGB pixel. There is no mention in the documents about this "feature". > > Is there a way to restore the previous behavior of TIFFRepresentation ? You can look at CGImageDestination to get more options, but I don't think there's anything that provides control at that level. In many cases there _must_ be data munging between the in memory pixel format and the on-disk file format. The precise munging is not defined on either input or output. That is, don't make pixel format assumptions. The AppKit release notes<http://developer.apple.com/mac/library/releasenotes/Cocoa/AppKit.html>discuss how to avoid making pixel format assumptions in the section "NSBitmapImageRep: CoreGraphics impedence matching and performance notes". -Ken _______________________________________________ Cocoa-dev mailing list ([email protected]) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
