6 Color Correction
and
Color Filtration
85
Unsharp Mask
This filter seeks for color transition boundaries in the image and improves their
sharpness.
The filter modifies pixel contrast on color transition boundaries, producing an overall
increase in image sharpness. This filter can be used for correction of images that
became blurred after interpolation – for example, after such operations as scale,
resolution modification or calibration.
To increase outline sharpness
1. Select an image you want to process on the screen and start the operation
using one of the following methods:
Click the
Unsharp Mask
button on the
Raster Image
toolbar
.
Choose
Unsharp Mask from the rFilter
menu.
- or -
Start the operation without selecting an image.
Select an image you want to process from the dialog box.
*
For more detailed information on the selection procedure see “Selecting
Several Images” on page 20.
The following dialog box is displayed:
2. Enter a value in the
Sensitivity
box or use the appropriate slider to specify the
desired effect of the filter application in percent from 0 to 100. The effect of the
filter application becomes stronger as this value is increased.
3. Enter the
Radius
value.
The higher the
Radius
value you specify, the more pixels surrounding the color
transition boundary will be processed. Low radius values only increase the
sharpness on the boundaries.
To adjust optimal parameter value for the entire image, first try out some
settings on a typical area in the preview window.
4. Choose
Apply
to run filtration.