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Sharpening With the High Pass Filter

  • Duplicate the image by dragging it down to the ‘New Image’ symbol. On the duplicate go to Filter > Other > High Pass. Apply a radius of 2 (Light effect), 3 (Medium), to 5 (Heavy) for a 36 megapixel image. I will need a different setting. Apply a blending mode of overlay, where 50% is invisible but other tones show through.

Sharpening in Lab Colour

  • Sharpening - Convert to Lab colour and only sharpen the L channel, then convert back to RGB, which does not sharpen colour edges and produce colour artifacts.

Upsizing an Image

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