Digital Photo Professional v3.9.2

Now got a new feature : unsharpen mask

A tutorial of sharpening (好詳細….sharpening都好多學問)

Unsharpen mask setting in Photoshop
Amount : 200
radius : no. of megapixel/1000-1500 (0.67 – 1 for 10.1 MP)
Threshold : 0

For fine details, a higher Amount and lower Threshold work best, while portraits and areas with smooth tones work better with a lower Amount and a higher Threshold.

Each image requires a different degree of sharpening, but here are some guiding points: With portraits, start off with an Amount of 100, a Radius of 1.0 and a Threshold of 6. For buildings or landscapes, try an Amount of 150, a Radius of 1.5 and a Threshold of 3. If there’s a lot of noise in an image, try going up to a Threshold of 10 or 12.

Unsharpen mask setting in DPP
The sharpness slider is non-selective
The sharpness slider loses its usefulness on images over iso 400. Here it just enhances the noise effect
The default USM settings i find the most useful for general snaps etc are Strength 5, Fineness 5 and Threshold 3-5
The threshold varies as the iso increases, 3 for iso 100-400, 4 for iso 400 and 5 for 800 and above (generally)

Amount is usually listed as a percentage, and controls the magnitude of each overshoot. This can also be thought of as how much contrast is added at the edges.

Radius controls the amount to blur the original for creating the mask, shown by “blurred copy” in the TEXT illustration above. This affects the size of the edges you wish to enhance, so a smaller radius enhances smaller-scale detail.

Threshold sets the minimum brightness change that will be sharpened. This is equivalent to clipping off the darkest non-black pixel levels in the unsharp mask. The threshold setting can be used to sharpen pronounced edges, while leaving subtle edges untouched. This is especially useful to avoid amplifying noise, or to sharpen an eye lash without also roughening skin texture.

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