Really bad banding and artifacts in 16-bit layered greyscale file. Bad banding is retained when converted to 8-bit with No flattening. Flatten 16-bit image and banding and artifacts disappear even with no dither or noise layer. Is this a known bug?
Has anyone else experienced this?
I thought it was a monitor problem at first, but I'm using a 10-bit per channel Eizo. It seems to be a Photoshop bug based on many layers interacting with each other. When I flatten everything is fine. But I need to work on this image with layers and decent fidelity. Interestingly when I convert to 8-bit without flattening (and utilising the dither function to potentially reduce banding even further), it uses the terrible artifact laden/banding to do the conversion even though when I zoom into 1:1 in my 16-bit document it looks fine. But 50% or 25% zoom I suddenly get these awful artifacts.
Here's some screenshots to clarify. Please note I've used Photoshop for 24 years so I'm no slouch but this is the first time I've seen this. The problem is I need to do some subtle airbrush and texture work on this and it's almost unusable unless I flatten (please note, it does the same in the original 8-bit file and just to say I Gaussian-Blurred every layer with a 30px radius after converting to 16-bit so the there's no longer any 8-bit information in there or reasons for banding/artifacts). I can only think it is some of bug in Photoshop's layering engine.
Has anyone seen this before - dealt with this before?
Thanks in advance.
Not sure these embedded images will work.
8% zoomed - see all the strange banding and triangular artifacts
<a href="http://imgur.com/izrGuia"><img src="http://i.imgur.com/izrGuia.png" title="source: imgur.com" /></a>
Flattened view - all smooth:
<a href="http://imgur.com/Pn35IAK"><img src="http://i.imgur.com/Pn35IAK.png" title="source: imgur.com" /></a>
50% zoom, still there:
<a href="http://imgur.com/Z207hFd"><img src="http://i.imgur.com/Z207hFd.png" title="source: imgur.com" /></a>
100% artifacts disappear:
<a href="http://imgur.com/6aGOz0V"><img src="http://i.imgur.com/6aGOz0V.png" title="source: imgur.com" /></a>
100% 16-bit layered
<a href="http://imgur.com/0XJfe5e"><img src="http://i.imgur.com/0XJfe5e.png" title="source: imgur.com" /></a>
and finally 8-bit layered converted from 16-bit with dither.
<a href="http://imgur.com/PSxiu43"><img src="http://i.imgur.com/PSxiu43.png" title="source: imgur.com" /></a>
help!
I can't speak to why, perhaps someone more knowledgeable than I can speak to that. But if it only happens at certain views then it's purely a display issue; it won't happen in print or when you downsample to display size. Such banding issues have always disappeared for me when I output to 8 bit.
I'd assume that it's because of your monitor; it can't display all the colors and when zoomed out there's too wide of a range in a small area so banding occurs. But that's just my guess.
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