printed photo question
Re: printed photo question
Run the Median filter on the individual channels. Usually the Blue channel will need the highest radius, then Green, with Red typically needing the lowest.
Then follow that with a GBlur using the same radius settings on each channel.
If it's a color picture, you might want to try converting to LAB and blurring the A&B channels either instead of the above or as a preliminary step. It should allow you to use a lower radius setting thereby retaining more detail.
Also look around on this site for FFT tutorials. It's a filter that does amazing things with repeating patterns such as prescreened originals.
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