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. For example, you can apply noise to computer-gener-
ated 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 intro-
duced during digitizing. Noise commands work with all image
modes except Black & White and Indexed.
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:
Choose 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.
If you want the noise to favor lighter and darker colors
within the specified range, choose the Gaussian option. This
option creates a more pronounced effect than Uniform.
5
If you want to add noise of different brightness levels of the
original color, select Monochromatic.
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.