 Pamela K. Barrett |
Unsharp Mask vs High Pass Filter I've learned 2 different techniques for sharpening. The Unsharp Mask and the High Pass Filter. I was wondering which one is better or is it just personal preference? It seems to me the results are the same and Unsharp Mask is a bit of a more simple process. What are the opinions of others on these two techniques?
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- Usman M. Bajwa Contact Usman M. Bajwa Usman M. Bajwa's Gallery |
Pamela, I have been using both sharpening techniques on images and don't have a runaway favorite too. However, I feel that with images having predominantly edgy subjects (like tree leaves against the sky, etc), the High Pass Filter works better as it does not attempt to sharpen the sky part at all and just would sharpen the leaves or the tree trunks. The difference between these is subtle though, IMHO. UB.
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Richard Lynch |
There are many sharpening techniques. I assume the method for High Pass that you are using is to run the filter on a new layer stamped visible and apply the layer in Overlay mode? There are other ways people use it. The method stated above and the Unsharp Mask will end up making very similar results as Usman said, but depending on the settings you use. For example, running Unsharp Mask with a 10 pixel radius and 75% will be close to running High Pass at 10 radius -- depending on the image content. I say close, but you would be able to notice some differences. Both methods increase edge contrast. It can be helpful to use them with over-all contrast reduction at times, depending on the image (usually images that are already very contrasty before sharpening benefit most). I use something similar to the following: 1. Stamp visible to a new layer. You can keep the effect limited to the tone by separating out the luminosity... I hope that helps! Richard
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