Debanding Tutorial
Start with a flattened image in Photoshop
Duplicate the layer
Click on the new copy
Go to Filter -> Blur -> Surface blur
Set the threshold to around 20
On the radius, start at 0 and move up in small increments until the original bands disappear
Click OK when you’re happy
Go to Filer -> Noise -> Add noise
Switch the settings to Gaussian with Monochromatic checked
Add enough noise to match the previous level included in the image. Usually 1-3% is sufficient
Click OK when you’re happy
Click back on the original background layer and choose select -> subject
Click on the new blurred and noised-up layer and hit the new mask icon
Press command (or control on windows)+I (for iglo) to invert the new mask
Grab a black brush and at 100% flow and opacity, with a soft edge, remove any parts of the image that are in the midground or foreground. You can dust around the subject at 30% if needed
Banding gone! NSFW content in preview below
