Contrast
To add special effect [Contrast] to the icon image, click [Contrast] from the [Filters] pull-down menu.
The Contrast command adjusts the overall contrast and mixture of colors in an image automatically. Contrast does not introduce or remove color casts. It maps the lightest and darkest pixels in the image to white and black, which makes highlights appear lighter and shadows appear darker.
Contrast can improve the appearance of many photographic or continuous-tone images. It does not improve flat-color images.
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