Adobe Photoshop CS6 Top 100 Simplified Tips and Tricks by Lynette Kent

APPLY HIGH PASS SHARPENING to increase edge sharpness
You can sharpen the overall image and particularly
the edges using a combination of the Unsharp Mask
filter and the High Pass filter. With this technique, you
first apply sharpening to a duplicated layer, and then
duplicate the sharpened layer and apply the High Pass
filter. This filter has the opposite effect of the
Gaussian Blur filter. Instead of blurring edges, the
High Pass filter removes any details or pixels without
strong edges and retains the details where the
sharpest color transitions occur.
You should generally sharpen your image in small
amounts and at different times in the editing process.
You first sharpen to correct the capturing blur caused
by scanning or the digital camera. After resizing and
color-correcting the image, you can sharpen a copy of
the image for your intended type of output, that is,
for viewing on a monitor or for printing.
If you sharpen your image on a separate layer, you
can apply a different type of sharpening when you
want to use the photo for a different type of output.
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1 Press Ô+J (Ctrl+J) to duplicate the
Background layer.
2 Click Filter.
3 Click Sharpen.
4 Click Unsharp Mask.
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5
6
7
7
The Unsharp Mask dialog box
appears.
5 Click and drag the Radius slider
to reduce the default radius
amount to 0.5 as a starting point.
6 Click and drag the Threshold
amount to 2.
Note: Threshold determines how
much contrast pixels must have
from adjacent pixels before they
have sharpening applied as edge
pixels. The default Threshold value
(0) sharpens all pixels in the image.
Try Threshold values between 2
and 20 to avoid introducing noise
or posterization.
7 Click and slowly drag the Amount
slider to the right until you see
halos on the edges.
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