On 30/09/2009, at 10:33 AM, Chilton Webb wrote:

I will take a shot at this. My concern is that I've seen CoreImage transitions bog down initially, I guess in their loading phase or something. I have an early model G5 that I use for testing the low end of the Leopard range (and it still looks strange to say G5 and Low End in the same sentence). On that machine, apps that use CoreImage tend to have a visual stutter initially, and I'm not sure if that's a CI thing or an app specific thing. Is there a 'push' effect for CI though?

Hmm, actually I don't think there is. There is one if you want to use the private CoreGraphics filters:

http://lipidity.com/apple/core-graphics-meet-core-image-demo-app
http://lipidity.com/apple/the-ultimate-core-graphics-resource

However, it's probably not a good idea for a shipping app.

CoreImage uses the GPU, so if the GPU is a bit feeble or you are using really large images then it may have frame rate issues, however Core Animation can have these issues too.

--
Rob Keniger



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