I want to scale images to 400x400 (I am creating thumbnails). I am using the Scriptable Image Processing System (SIPS) in a Cocoa application, but the problem is poor efficiency. SIPS takes 70-90% CPU while converting 300 images in 20 seconds. Should I use the CIImage class (CIImage is the type required to use the various GPU-optimized Core Image filters) or NSImage class? Can anyone suggest a better method?
Scaling of image (scriptable image processing system)
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A very simple and fast way to generate thumbnails on OS X is to use QLThumbnailImageCreate.
It's just one line of code so you can easily try out how it compares to SIPS & Core Image.
I tried thumbnail genration using NSImage , CIImage and sips. All are taking same CPU (70-90%) usage but sips is faster.