Canon S450 User Manual page 453

Modifying an Image
You can modify a scanned image so that it looks sharper or softer. Also, a Despeckle
function allows you to remove speckling and make a scanned image appear cleaner. A
function for inverting colors to produce a negative film is also available.
Click the Menu button in the main dialog box, select Image, and then select
1
the desired function from the submenu.
Sharpen
Soften
Despeckle
Invert
You can check the effect of the adjustment in the Preview Area.
Sharpens an image to make it clearer.
Softens the edges of an image.
Removes speckling from an image, making any such
areas less noticeable.
Inverts the colors of an image to produce a negative
of the original.
Using the Scanner With Macintosh 453