When you have a picture with lots of sand in the water or other white particles Photoshop "Dust and scratches" filter does a fast cleaning up compared to the manual treat.
However overall sharpness is severely influenced.
I tried the following:
copy the layer and set blending mode to 'darken'
apply the filter to the background layer
It is fast, speckles are out and sharpness is far better.
Hi Sven,
I think the way you explained your technique still causes an image to look blurry. Do you have an example? I think you might get better results experimenting with the History Brush. Also, have you tried using the Median filter instead; I feel it does a better job than dust and scratches for lots of underwater images you want to correct quickly.