User Guide

Chapter 5: Painting And Image Editing
To add noise to selections:
1. Select one or more paint objects to adjust. Select an area in one image to adjust the selected
area only.
2. Choose Image | Filter | Noise | Add Noise.
3. Enter 1 to 999 for Amount to specify how far the color of the noise can vary from the original
color.
4. Choose the Uniform or Gaussian distribution option:
Uniform: To apply colors randomly picked within the Amount specified. Canvas evenly
distributes the color of the noise across a range of colors. This option gives the smoothest
effect.
Gaussian: If you want the noise to favor lighter and darker colors within the specified
range. This option creates a more pronounced effect than Uniform.
5. Select Monochromatic if you want to add noise of different brightness levels of the original
color.
6. Click OK to apply the noise settings.
Removing noise from selections
You can remove noise from an image or selection using the Median, Despeckle, or Dust & Scratches
filters. The Median filter removes noise by averaging the color of pixels. The Despeckle and Dust &
Scratches filters remove noise by selectively blurring regions of the selection.
To use the Median filter:
On a pixel-by-pixel basis, the Median filter applies the median color value of all pixels within the
specified radius. Although the filter ignores extreme values in its computations, higher radius values
can still wash out an image.
1. Select one or more paint objects to adjust. You can select an area in one image to adjust the
selected area only.
2. Choose Image | Filter | Noise | Median.
3. Type a value from 1 to 16 in the Radius text box, or drag the slider. Smaller radius values
produce subtler effects.
4. Click OK.
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