Graphics Programs Reference
In-Depth Information
The Threshold slider is used to determine how different the pixels must be before they are
considered an edge and therefore sharpened. A value of 0 will sharpen all the pixels in an
image, whereas a setting of 10 will only apply the effect to those areas that are different by
at least 10 levels or more from their surrounding pixels. To ensure that no sharpening oc-
curs in sky or skin tone areas, set this value to 8 or more.
Unsharp Mask filter workflow:
1 Select Filter > Sharpen > Unsharp Mask.
2 Adjust Amount slider to control strength of filter.
3 Adjust Radius slider to control the number of pixels surrounding an edge that is
included in the effect.
4 Adjust Threshold slider to control what pixels are considered edge and therefore
sharpened.
BEFORE
AFTER
The Adjust Sharpness fea-
ture contains Amount and
Radius sliders as well as a
variety of sharpening ap-
proaches in the Remove
menu.
Editor: Enhance > Adjust Sharpness
The Adjust Sharpen feature provides all the control that we are familiar with in the Unsharp
Mask dialog plus better edge detection abilities, which leads to better results and in par-
ticular less apparent sharpening haloes. The feature's dialog contains a zoomable preview,
two slider controls, a drop-down menu to choose the sharpening approach used and a More
Refined option.
The user can control the sharpening effect with the following settings:
Amount - Strength of sharpening effect.
Radius - Determines the extent of sharpening. Higher values equal more obvious edge
effects.
Remove - Determines sharpening algorithm used. Gaussian Blur uses the same approach
as the Unsharp Mask filter. Lens Blur concentrates on sharpening details and produces
results with fewer haloes. Motion Blur reduces the effects of blur caused by camera shake or
subject movement.
 
 
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