Autodesk 00126-050008-1640A User Guide - Page 83

6 Color Correction and Color Filtration 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. 85