Hmm, this is really hard to debug without seeing the actual filters. But if I would need to guess, I'd say the implementation of the ROI callback (passed when calling the CIKernel) is wrong. I can also recommend using a MTKView for displaying a CIImage instead of using Core Graphics. There is a sample from Apple showing how to do that.
Topic:
UI Frameworks
SubTopic:
AppKit
Tags: