Photoshop Rendering Bug When Zooming

Question

I've just noticed that PS is rendering colours differently at different zoom levels. At least it seems to be switching to a more accurate / wider gamut when more zoomed in.

16 Bit / ProPhoto

At 33.3% [TIF]

At 66.7% [TIF]

This is clearer in the TIFSs (links above) rather than as JPGs, but I think it is still pretty clear. The image is toned with a Gradient Map (Selenium), and at 33% there is strange banding between the darker areas which appear toned and the mids/highlights which don't. At 66.7% the toning appears evenly.

davescm · Answer

Noel Carboni, who use to post here a lot and had a real in depth knowledge of the technical aspects, once explained to me that as well as the scaling, previews at zoom levels of less than 66.7 % did not use full 16 bit. That also explained why a bug that impacted blending modes, that came in a couple of versions ago, and is now resolved, was only seen when zoomed in (it did not impact 8 bit). The image is not affected just the screen preview but it was another reason to view at 100% when checking how an image really looks.

Dave

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