RustyBug Offline Upload & Sell: On
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+1 @ Robbie36 @ the halo is visible, etc.
My approach to halos is diff from the correction, but rather the prevention.
Typically, the halo is a result of a sharpening algorithm giving instructions to give an increase in variance between pixel values. In areas that already have sufficient contrast/variance, the additional instruction to increase (globally applied) contrast between existing values can create halos (light or dark) as Robbie36 has mentioned.
Imo, the key is not to figure out how to "correct" for them, but rather how to prevent them. One way is to apply a mask on your sharpening layer that you feather/brush over the outline area on your sharpening layer mask. Another way is to adjust your "blend if" settings such that they don't render the change on the new layer. Another way is to apply sharpening on duplicate layers with one set to darken, the other set to lighten. Then you can adjust the opacity of the lighten layer to reduce the brighter areas of the halo.
I routinely will use a combination of the latter two techniques (avoids brush work) to mitigate halo generation. Takes a few extra steps and I get lazy not wanting to bother with the time/effort to dial it in ... but I'm usually glad when I have done so (which is typically my last / near last steps for an image). If I still have the halo, then I go back through, turning layers on/off to find out which one(s) seem to be driving it the most and address it their through "blend if" / opacity / mode / mask to reign it in.
Edited on Aug 10, 2014 at 11:05 PM · View previous versions
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