User Manual

Image Broadway 6 Help
Filters and Special Effects > Sharpen Effect > Unsharp Mask
Unsharp Mask
The unsharp mask filter uses the Gaussian blur filter with a defined number of neighboring pixels to be included in the
convolution. It applies the amount of the percentage of the differences between the original and the blurred image pixels
and add it back into the image for those pixels with differences above the specified threshold.
Choose the Filters/Effects > Sharpen > Unsharp Mask menu item to apply the unsharp mask to the active item or to
the selected area.
1.
Enter a value from 0.10 to 250.00 for the radius. A larger radius value requires more hardware resources and takes
longer processing time. The status bar at the bottom of the Sharpen dialog indicates the status of progress.
2.
Enter a number from 1 to 500 for Amount and from 0 to 255 for threshold.3.
Check off the Preview option to preview the effect of the filter on the active item. Try different values if you want, and
press Enter to see the result on the screen instantly. Click OK to confirm the action, click Cancel to cancel the action,
or click Reset to reset the values in the dialog.
4.
An example with the before and after images is shown below. The hair and dress of the girl are sharpened. However,
they are not as sharp compared to the Selective Sharpen example.
5.