I had CS5 installed over a year ago and running without any display problems until recently. About a week ago I noticed severe banding in the high light areas of my images when I opened them in PS. At first I thought there was something wrong with my camera, or just plain bad images, until I realised that the images display without any banding in Windows Photo Viewer or any other viewer! I'm running Windows XP SP3. I have not made any hardware, software or other changes recently (except installing a Nik S/W plugin – which I subsequently uninstalled but that did not solve the problem). Also no changes in colour profiles etc. I also updated CS5 to the latest version; disable/enabled Open GL acceleration in the preferences without any effect on the problem. I am at a loss.
Could be a driver issue (GPU quantization due to bad shader implementation), or it could be a bad display profile (with a bad table or 3DLUT).
Try setting the display profile to sRGB in the OS controls, see if that helps.
Next, try disabling GPU drawing in Photoshop, then restart Photoshop.
Thanks smokingcig: That was the problem and I am relieved and embarrassed at the same time: the monitor colour settings were wrong (16 bit instead of 32 bit colour). It was just so much more noticeable in PS than in other apps… Sorry for wasting your time guys! But thanks a lot anyway.
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