This has so far only been tested on SnowLeopard. I'm going to divide this into two issues, since I'm not 100% sure they're related.
1) On redraw, a filtering is applied that changes the image quality. Are you seeing this change on first redraw from a large NSImage (rather than from a url to an image)? 2) The filtering applied may actually be appropriate for photographs, but I'm dealing with line drawings, which become completely unusable when scaled in this way. Even zero antialiasing would be greatly preferred 3) (Not an issue, but a possible solution that didn't work.) If providing an NSImage with multiple NSImageReps that only vary in resolution, icon style, IKImageBrowserView seems to always work with the first/largest. If I could make this work, I'd just generate multiple thumbnails. (I suppose I could throw away all thumbnails on bump the version number on scale change... expensive, though.) I've put up three screenshots: • http://www.addaon.com/IKImageBrowserView_scaling_A.png is a manually-scaled high-quality image (about half the size of the original; just for comparison) • http://www.addaon.com/IKImageBrowserView_scaling_B.png is how it appears initially (before redraw); this is marginally acceptable • http://www.addaon.com/IKImageBrowserView_scaling_C.png is the over-filtered form Again, the transition between B and C happens whenever I cause a redraw, for example by clicking on the background. Hard to overstate this problem. Adam On Tue, Dec 8, 2009 at 5:59 AM, Thomas Goossens <tgooss...@mac.com> wrote: > Hi Adam, > > Is this on Leopard or Snowleopard ? > I just tried to load images from /System/Library/Desktop Pictures in an > IKImageBrowserView using the NSImage representation. They appears just fine > for me (SnowLeopard). > > > I'm trying to move from a custom view to an IKImageBrowserView in a > project, > > and running into a somewhat odd problem. Context: my IKImageBrowserItems > are > > IKImageBrowserNSImageRepresentationType, backed by a relatively > > large (~600x800) NSImage. > > > > When first drawn, at any scale factor, this looks great. However, as soon > as > > a redraw (not a reload!) occurs, the quality goes to hell. For example, > > clicking in the browserview will cause this problem instantly. It's as if > > it's deciding all of a sudden to fall back to a cached image of much > lower > > quality. Scrolling seems not to trigger a redraw of this type; so if a > large > > view containing as-first-drawn high quality images is clicked, only the > > currently visible thumbnails will get degraded, and scrolling can then > > present a mix of degraded and full-quality images. > > > > Needless to say, this huge a reduction in image quality is not > acceptable. > > How can this be prevented? > _______________________________________________ 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
