Color Banding - The appearance of visible bands of colors that replace subtle gradations in order to accommodate a reduced palette.
If color banding is visible, then this might mean that your monitor needs re-calibration. It's generally recommended to perform this once every month or so, depending on how important color accuracy is to your work.
A poorly exposed image presents a litany of problems and can add a lot of time and frustration in post-production. Some of these problems include noise, wild color shift, blown highlights, lost shadows, color banding, ...
It works best if you just want to add 50 percent more pixels to the original file. Increasing a file size beyond that may result in soft images with color banding in fine gradations, and other artifacts.
 See also: Digital camera, SLR, Sensor, Software, Image
  
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