Eliminate false banding in Photoshop
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- เผยแพร่เมื่อ 18 ต.ค. 2024
- Starting with Photoshop v23.5.0 you can enable a tech preview to avoid false banding (the appearance of banding when there is none in your 16-bit image).
See the written version of this tutorial at gregbenzphotog...
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Excellent summary of the banding issue Greg and appreciate the info regarding the latest PS version. Just checked my settings and it appears to be on by default.
Thanks Greg, have been looking for the answer for this for some time.
Thanks for letting us know how to correct this. I've seen the banding in my photos from my Nikon Z7ii and wondered what was wrong. So glad Adobe fixed this.
Thanks Greg, a very informative video.
very talented teacher - cheers
Thanks Greg. I really appreciate your effort to stay up to date with those things and communicate them to us!
My pleasure!
Thank you, Greg. As usual, very informative!
Greg, Thanks for pointing this out. The banding has been bugging me for a while now. I've always suspected that it wasn't really there.
Glad it was helpful. I run into questions about this all the time, it confuses a lot of people (for very understandable reasons - it’s only natural to assume you’re viewing the real image).
Thanks Greg nice video. I still get very occasional banding (and slightly odd colors) on very smoothly changing skies in images when I save them to jpeg. I don't really understand why, but googling around, I found that if I convert to profile edit>convert to profile>choose sRGB then the saved jpeg image looks as it did on PS as I was editing. It only happens on 1 image in 20 or so 🤔
The conversion is reducing the gamut, which can help banding - and you be be adding dithering this way to help banding as well. My sharpening panel would help take care of this for you as well as long as you don’t force another color space or choose the lowest quality.
That's very strange. I've never seen such dramatic banding only for preview, and I've been using Photoshop since CS version or earlier on windows. I even made a video about Bit depth many years ago, going over in detail about everything you never wanted to know about bit depth. Trust me, this is not a banding problem that should be in Photoshop.
It seems to me that what you are seeing is either a bug, problem with GPU drivers, or specific to an operating system MacOS vs Win or specific version of those operating systems. Its also possible that its related to monitor. Curious, what bit depth is your monitor?
It’s not a bug, it’s the expected behavior for an 8-bit preview system. If I change my 16-bit images I used here to 8-bits I see identical results (but the banding would then be real in that case). I probably should have shown that, as it’s good info for comparison.
I just chose to use overly aggressive settings to make it clear. Real world experience of this issue is generally more subtle, and might be very hard to see in a TH-cam video.
The video matches my monitor on this end, but wouldn’t over TH-cam in many cases due to compression or changes in screen resolution.
I still notice something similar to false banding even with these settings enabled. I have a 16-bit image that shows banding only in Photoshop, but it shows no banding in any other program I use. Saving in photoshop results in an image without banding when I open it with other programs. Only in photoshop, It shows banding.
Flatten the image or zoom to 100% to confirm the banding is not real.
I don’t know if some configurations skip this 16-bit preview for the sake of speed (such as with an old GPU). I wouldn’t be surprised if it is subordinate to performance goals on older computers.
What would happen if you tried to print the image? It happened to me - I saw the banding on screen, (black and white landscape), and it printed the same. Not sure if it's the same problem that you've highlighted or a different problem.
The data is internally flattened to print, the issue here only affects viewing of 16-bit images without the benefit of the new 16-bit previews (if the image were 8-bits, this banding would be real and would affect the flattened image and print).
interesting stuff, how do i get LR to open images as 16bit within PS?
Just export as 16
I’ve done all that and im still getting sick banding in PS preview and when i open the photos on windows, but when i send them to my iphone or upload them to google drive everything is fine. But it’s a pain in the ass editing with that much banding on preview I really don’t know how to fix it
Do you see banding when zoomed into 100% or you flatten the image. If is, the banding is real.
Or are you saying the 16-bit preview is failing to stop the banding?
Guys lets say im writing a piece on soft soft. Is there any I can use 10 different tutorial without having to open 10 kontakt windows
?
One wonders why it took Adobe so long to implement this feature, and why it is just a beta preview at the moment.
Needed better performance, and not a lot of people asking for it. But with a change affecting display, one always wants a way to turn off if they missed something in testing. I expect it quickly becomes just a regular part of PS.
Tutorial*