User Guide

Canvas 12 User Guide
To sharpen an image:
1. Select one or more paint objects to sharpen. You can select an area in one image to sharpen
the selected area only.
2. Choose Image | Filter | Sharpen, and then choose a filter.
Original Sharpen More
applied 5 times
Sharpen Edges
applied 8 times
Unsharp Mask
Amount = 113
Radius = 4.5
Threshold = 0
To apply the Unsharp Mask filter:
1. Select one or more paint objects to sharpen. Select an area in an image to sharpen the
selected area only.
2. Choose Image | Filter | Sharpen | Unsharp Mask.
3. Enter 1 to 500% for Amount. Enter less than 100 percent to sharpen the image slightly.
4. Enter 0.1 to 250 pixels for Radius. This is the size of the area used to determine new color
values for the original pixels. Smaller values focus the sharpening effect on high-contrast
edges.
5. Enter 0 to 255 levels for Threshold. Enter 0 to filter all pixels. Enter a larger value to filter
only high-contrast edges.
6. Click OK to apply the filter.
Adding and removing noise
In images, “noise” refers to randomly-colored pixels. Noise can be good or bad; e.g., you can apply
noise to computer-generated graphics to make them appear more photographic. You can also use a
filter that removes noise to minimize the appearance of tiny scratches or other artifacts present in the
source material or introduced during digitizing. Noise commands work with all image modes except
Black & White and Indexed.
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