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Re: Which format for image file resources in Cocoa application?
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Re: Which format for image file resources in Cocoa application?


  • Subject: Re: Which format for image file resources in Cocoa application?
  • From: John Stiles <email@hidden>
  • Date: Sun, 14 May 2006 21:15:13 -0700



Ben Kazez wrote:
On Sun, 14 May 2006 14:05:01 -0700, John Stiles wrote:

Christian Walther wrote:
John Stiles wrote:
I would assume that, much like icons, a framework should typically
prefer the smallest image that does not need to be scaled up.

e.g. with icons:
34x34 - 128x128 is scaled down
33x33 - 128x128 is scaled down
32x32 - use the 32x32 native version
31x31 - 32x32 is scaled down
30x30 - 32x32 is scaled down

Is this an observation of current behavior in Cocoa or a wishlist? If it's the former, I'd like to know how you achieved it. My experience with NSImage is that at 31x31, 128x128 is scaled down rather than 32x32, which makes for a suboptimal appearance.
It's actually an observation of the Finder's behavior. I do not know
what APIs the Finder uses internally to get this behavior.
Upon experimentation I find that the Dock does not work this way,
unfortunately.

This is actually the documented behavior:

"Although the Dock doesn’t use hints (it uses a sophisticated algorithm on the 128 x 128 version), [smaller-sized] hints are important for preserving crucial details in Finder icons."

<http://developer.apple.com/documentation/UserExperience/Conceptual/OSXHIGuidelines/XHIGIcons/chapter_14_section_4.html>

Wow, that's really bizarre. "Hints are important for preserving crucial details, but the Dock doesn't use them because it's scaling algorithm is so super-sophisticated." I call BS. ;) The Dock should respect the smaller sizes.

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