Comments on: How to Resize an NSImage http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/ Buzz Andersen's Weblog Sun, 07 Sep 2008 06:58:46 +0000 http://wordpress.org/?v=2.3.1 By: Victor http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-3424 Victor Thu, 19 Jan 2006 23:58:28 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-3424 NSImage setSize does in fact work...however I have a strange situation where the bitmapImageReps have a wierd out of phase appearance at oddball resize dimensions...like 50% and 80% (I have the resize tied into an NSSlider) I tried BUZZ's code to no avail Got any Ideas? NSImage setSize

does in fact work…however I have a strange situation where the bitmapImageReps have a wierd out of phase appearance at oddball resize dimensions…like 50% and 80% (I have the resize tied into an NSSlider) I tried BUZZ’s code to no avail

Got any Ideas?

]]> By: Arathi http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-475 Arathi Thu, 21 Jul 2005 11:42:10 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-475 I have an application in which i try to resize the NSImage to new resolution.Sometimes i use the destination image resolution is same that of source.I have to do some other functionality also.My problem is I make a new NSImage with same resolution as that of the source , the clarity of the new NSImage is less.Any way to maintain the quality of the new NSImage as that of the source NSImage. I have an application in which i try to resize the NSImage to new resolution.Sometimes i use the destination image resolution is same that of source.I have to do some other functionality also.My problem is I make a new NSImage with same resolution as that of the source , the clarity of the new NSImage is less.Any way to maintain the quality of the new NSImage as that of the source NSImage.

]]> By: Sven Weidauer http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-453 Sven Weidauer Fri, 01 Jul 2005 21:03:36 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-453 Buzz: I never tried scaling bitmap images like that. It did work for scaling a PDF page and grabbing the TIFF representation of that. Buzz:

I never tried scaling bitmap images like that. It did work for scaling a PDF page and grabbing the TIFF representation of that.

]]> By: Ken http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-432 Ken Mon, 27 Jun 2005 19:17:11 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-432 Frasier, Check out the ImageIO framework, new in Tiger. It handles _everything_, it totally rocks. Frasier,

Check out the ImageIO framework, new in Tiger. It handles _everything_, it totally rocks.

]]> By: Buzz Andersen http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-431 Buzz Andersen Mon, 27 Jun 2005 18:29:23 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-431 Ken: Thanks for the test. I actually think that the high interpolation ones look pretty darn good, and I think I'll switch to using that method in Cocoalicious. Sven: Are you sure about that? I could have sworn I tried that and it didn't work. Ken:
Thanks for the test. I actually think that the high interpolation ones look pretty darn good, and I think I’ll switch to using that method in Cocoalicious.

Sven:
Are you sure about that? I could have sworn I tried that and it didn’t work.

]]> By: Sven Weidauer http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-430 Sven Weidauer Mon, 27 Jun 2005 12:07:32 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-430 [NSImage setSize] can scale the image. All one has to do is to call [NSImage setScalesWhenResized: YES] first. [NSImage setSize] can scale the image. All one has to do is to call [NSImage setScalesWhenResized: YES] first.

]]> By: Ken http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-429 Ken Mon, 27 Jun 2005 10:27:12 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-429 Okay, I did a little test out of curiosity. High interpolation certainly looks a lot better than I guessed it would, and no interpolation is a clear loser on my test set. I've been waffling on whether I prefer low or high interpolation, but right now I'm thinking high. :-) You can see the images at http://homepage.mac.com/kenferry/temp/FavIconsInterpolationTest.zip The images are freshly downloaded favicons, resized to 13x13 pixels since that's what Buzz does above. The favicons tested are those that are in my NetNewsWire cache, but I redownloaded them in case Brent messed with the images before he saved them (it looks like he didn't). The holes in the grid indicate images that NSImage was unable to load. I don't know what's going on with that. Okay, I did a little test out of curiosity. High interpolation certainly looks a lot better than I guessed it would, and no interpolation is a clear loser on my test set. I’ve been waffling on whether I prefer low or high interpolation, but right now I’m thinking high. :-)

You can see the images at http://homepage.mac.com/kenferry/temp/FavIconsInterpolationTest.zip

The images are freshly downloaded favicons, resized to 13×13 pixels since that’s what Buzz does above. The favicons tested are those that are in my NetNewsWire cache, but I redownloaded them in case Brent messed with the images before he saved them (it looks like he didn’t). The holes in the grid indicate images that NSImage was unable to load. I don’t know what’s going on with that.

]]> By: Fraser Speirs http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-428 Fraser Speirs Mon, 27 Jun 2005 08:30:36 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-428 If you think that's a pain, try doing that on a digital photo without losing the EXIF data :-) My only resort was to call out to /usr/bin/sips in FlickrExport. Haven't yet investigated Core Image, but I'm pessimistic that it will preserve EXIF all the way through. If you think that’s a pain, try doing that on a digital photo without losing the EXIF data :-)

My only resort was to call out to /usr/bin/sips in FlickrExport. Haven’t yet investigated Core Image, but I’m pessimistic that it will preserve EXIF all the way through.

]]> By: Eric Blair http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-427 Eric Blair Mon, 27 Jun 2005 01:11:01 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-427 D'oh. I didn't even think of resizing the cached version instead of resizing at display time. D’oh. I didn’t even think of resizing the cached version instead of resizing at display time.

]]> By: Jens Alfke http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-425 Jens Alfke Sun, 26 Jun 2005 20:12:08 +0000 http://weblog.scifihifi.com/2005/06/25/how-to-resize-an-nsimage/#comment-425 Hm, it's an aesthetic issue, but I disagree with Ken -- high interpolation looks good for small icons too. In my current project I'm taking usericons, that are usually 64x64 or later, and resizing them down to 16x16 with good results using high interpolation. Hm, it’s an aesthetic issue, but I disagree with Ken — high interpolation looks good for small icons too. In my current project I’m taking usericons, that are usually 64×64 or later, and resizing them down to 16×16 with good results using high interpolation.

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