Lowpass

The Lowpass command suppresses high spatial frequency components by averaging a 3 x 3 pixel region centered on each pixel.

Data is analyzed in kernels (matrices), with every pixel individually recalculated based upon the values of its neighboring pixels.

1. Select an image file from the file browsing window at the right of the main window. Double-click the thumbnail image to select and open the image.
2. You can open the Lowpass view, shown in Figure 3, using one of the following methods:
   • Right-click on the image name in the Workspace and select Add View > Lowpass from the popup menu. See Figure 2.

Or

• Right-click on a thumbnail in the Multiple Channel window and select Lowpass.

Or

• Select Modify > Lowpass from the menu bar.

Or

3. Click the Lowpass icon in the toolbar.

4. Select the Output File Name.
5. Click the Execute button to apply the filter to the image.
6. To restore the unprocessed image, click the Reload button.
7. The filter always applies a 3 x 3 filter to the image. The filter may be applied multiple times for increased blurring effects, as seen in the right image of Figure 4.