On Apr 6, 2010, at 17:24, Chris Tracewell wrote: > On Apr 6, 2010, at 4:50 PM, Ken Ferry wrote: > >> >> On Tue, Apr 6, 2010 at 2:58 PM, Jens Alfke <j...@mooseyard.com> wrote: >> >> On Apr 6, 2010, at 1:17 PM, Chris Tracewell wrote: >> >> I am trying to get NSImageView to alias dropped images, but it refuses. >> >> Nitpick: you mean "antialias". Aliasing is what creates the jaggies, >> antialiasing smooths them away. >> >> >> Just spent an hour looking and trying several variations to no avail. Here's >> what I have done in a subclass of NSImageView. >> >> I remember having to deal with this too, years ago. It's too bad AppKit >> hasn't added support for this yet :( >> >> The problem is that NSImageView internally keeps a scaled copy of the image. >> So the actual scaling that creates the aliasing isn't done in the drawRect: >> method at all. >> >> This was once true, but is out of date. I'd like to see a test app. For >> example, how do you know you aren't getting antialiasing? It may be that >> you just don't like the output. :-) > > Well - NSImageInterpolationHigh and NSImageInterpolationNone produce the same > exact result - screen shot copy (control-command-shift-4) the imageView built > once using NSImageInterpolationHigh and once using NSImageInterpolationNone > then paste each into a Photoshop layer, align them perfectly and then turn > the top layer off and on at 800% and there is not a single pixel that moves > or changes color. > > The dropped image is roughly 1000 x 1000 (a screen shot PNG) and the > imageView size is 200x200 > > To make sure the currentContext was correct - I log [[NSGraphicsContext > currentContext] imageInterpolation] for each build and it shows the correct > values 3 and 1 respectively. And then just to be super sure I I log > [[NSGraphicsContext currentContext] isDrawingToScreen] inside drawRect of my > NSImageView subclass and get YES. > > I did implement my own image sizing in drawRect and then used [self setImage] > and it works great. Not sure what could be the issue.
Funny you're mentioning this problem as I've been trying to get a thumbnail icon of a pdf document and I get pretty much the same results. It doesn't seem to matter whether I use NSInterpolationHigh or NSInterpolationNone, at least I couldn't see any difference in the resulting image in Preview even when magnified. -Laurent. -- Laurent Daudelin AIM/iChat/Skype:LaurentDaudelin http://nemesys.dyndns.org Logiciels Nemesys Software laurent.daude...@gmail.com Photo Gallery Store: http://laurentdaudelin.shutterbugstorefront.com/g/galleries _______________________________________________ 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
