Adjusting sharpness the professional way.
Method 1 - Unsharpen mask.
Typical Values -
Amount - 140 - This is the contrast between light and dark pixelsat edge.
Radius - 1.0 - Amount of pixels on either side of edge to be affected.
Threshold - 0.0 - Whether something can be considered an edge, low
number contrast applies to all image and pixels.
Method 2 - LAB Conversion
1. Open image in photoshop.
2. Convert image to LAB, image menu - mode - choose LAB colour.
3. Select lightness channel and sharpen image using unsharpen mask.
4. Convert back to RGB, image menu, Mode, RGB colour.
5. Save file.
Settings for unsharpen mask
1. For people - Amount 150%, Radius 1, Threshold 10.
2. For City, Urban, Travel - Amount 65%, Radius 3, Threshold 2.
3. For general everyday use - Amount 85%, Radius 1, Threshold 4.
4. Landscape - Amount 100%, Radius 0.6, Threshold 0.