On 25 Jul 2011, at 20:04, James Merkel wrote: > What is the fastest way to generate and display a thumbnail from a digital > camera file? > In the past I used NSImage -- however the quality (with JPEG files) leaves > something to be desired. Now I am using CIImage with Lanczos scale transform > -- quality is very good but it is slow (particularly with raw files).
Lanczos is high quality and slow, no way around that. > > Should I be using the thumbnail capability of Image I/O? Will it have as good > a quality as CIImage, but be faster? Yes, you should be using it. It won't be as high quality as CIImage though. > > I am comparing the speed of my app (running in Xcode) with the speed of > Preview. Preview is much faster ( 2x or 3X). I wonder what they are doing. > > Of course the fastest way to display a thumbnail is to use the thumbnail in > the file (assuming there is one). But that's the problem, there may not be a > thumbnail in the file, in which case you need to create one yourself. That's exactly what ImageIO offers you; the ability to use embedded thumbnail if present. _______________________________________________ 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
