darktable is an open source photography workflow application and raw developer:
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0:00 Intro
01:21 Diffusion
12:17 Sharpening
16:22 edit 1: local contrast enhancement
23:09 edit 2: sharpening
28:28 edit 3: diffusion and soft contrast
36:19 edit 4: diffusion and soft contrast
42:02 edit 5: detail enhancement in the highlights with subtract blend mode
49:15 edit 6: detail enhancement in the highlights with subtract blend mode
53:18 Outro


Description of the diffuse and sharpen module in the official user manual:
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Videos about the module:
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Free/Open Source Photography:
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