You are all trying to kill a mosquito with a shotgun. GLSL or CoreImage is not ment to be the used for everything. Some basic OpenGL skills would teach you what can be done without those. I've attached an example.The only thing is that I'm not sure what is done with images larger than the graphics card supports (for most it means 4096x4096). If you can get into software rendering then you can use images up to 16384x16384.
I hope this helps at least a bit. -Michael
ScrollThrougLargeImages.qtz
Description: application/quartzcomposer
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