Canon MultiPASS F20 Software User's Manual page 112

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To blur an image (Truecolor image type):
1. On the toolbar or Filter menu, click Blur.
In the Blur dialog box, the original image appears on the left. As you
modify the image, you can see the results on the right.
Images appear with a blur value of 50. Because the modified image
cannot be made clearer than the original, specifying a blur value of
less than 50 does not affect the modified image.
2. In the Blur dialog box, specify the desired value or move the slider to
the left for less blur, right for more blur.
When you blur an image, you average the color values of adjacent pixels,
removing peaks, to make the image smoother.
To sharpen an image (Truecolor image type):
1. On the toolbar or Filter menu, click Sharpen.
Chapter 5
When you change the brightness and contrast, you set the values
in the specified black point and white point range.
When you change the gamma, you adjust the mid-tones of the
image to increase its contrast and enhance the overall image.
When you increase the gamma value, light areas are made lighter,
and dark areas are made darker.
Viewing and Enhancing Images 108