Photoshop: Reversing posterization

01/31/2006 01:56:19 AM · #1

Can anyone tell me a trick for removing color banding from an image. I don't know what part of editing caused it, but it might be an artifact of resizing. It looks like a very mild case of using Posterize. I'll probably re-edit the image tomorrow, but anyone with a tip, I'd be greatful.

fotomann_forever

01/31/2006 02:06:17 AM · #2

You haven't bumped the saturation up too much have you? That's one cause. But, hard to say w/o looking at the photo.

Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)

01/31/2006 02:09:53 AM · #3

Nope only desaturated in 2 channels by 5 points.

GeneralE

Canon PowerShot S3 IS

01/31/2006 02:27:54 AM · #4

Whenever I see unexpected banding I check my monitor settings to make sure the number of colors hasn't been accidentally reduced.

Sony SAL-50F14 Normal 50mm f/1.4 Autofocus Lens for the Sony

01/31/2006 12:34:06 PM · #5

Originally posted by GeneralE:

Whenever I see unexpected banding I check my monitor settings to make sure the number of colors hasn't been accidentally reduced.

Nope 32-bit all the way...

ladyhawk22

Sony DSLR-A700

01/31/2006 01:10:38 PM · #6

Did you use USM? Unsharp Mask?

fulgent

Canon EOS-20D

Canon EF-S 18-55mm f/3.5-5.6

01/31/2006 02:27:28 PM · #7

One time that I had over smoothed an image and when it was printed there would be a banding. This was because the printer could not print that smooth a gradient and so every band represented 3% of the gradient. It could not do the subtle differences.

What was needed was not to smooth to much or to add noise to prevent the banding in the printer.

If it's to smooth for your monitor you may need to select a higher resolution on your monitor.

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

01/31/2006 02:37:47 PM · #8

Originally posted by ladyhawk22:

Did you use USM? Unsharp Mask?

Yes, but not heavily. I'll watch for it when I re-edit.

BrennanOB

Canon EOS-1D Mark II

01/31/2006 02:43:00 PM · #9

Is this banding on your screen or in the print? Oddly adding some noise can blur the transitional points and reduce banding if the image is too smooth for the display.