Banding is a visible transition from like color.
Conditions that can create banding:
► Changing the color space (rare)
► Changing the color bit depth (from high to low)
► Using a gradient filter (It depends on the color bit depth)
► Using levels to darken will reveal all banding issues (sample)
► Reducing an image in pixel size
► Using a lossy compressed file format (like a JPG)
Banding can be corrected in post-processing.
Gradient plus dark level adjustment
To correct banding is simple...
PS CC method:
► Create a selection (or selection around the banding)
► Feather the selection*
► Use the filter surface blur
► Remove the selection
* This will avoid hard edges that are just as bad as banding.
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