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3) Select the filter to apply. To show the name of the filter, hover the

mouse pointer over the icon and wait for the tooltip to appear.

If you are not satisfied with the effect obtained or you want to try a

different one, before doing anything else click the Undo button or

select Edit > Undo: Bitmap Graphic Filter from the menu bar or

press Control+Z.

Table 1 describes briefly each of the available graphic filters and their

effects. See the Draw Guide for examples of the effects.

Table 1: Graphic filters and their effects

Icon Name Effect

Invert Inverts the color values of a color image, or the

brightness values of a grayscale image.

Smooth Softens the contrast of an image.

Sharpen Increases the contrast of an image.

Remove

noise

Removes single pixels from an image.

Solarization Mimics the effects of too much light in a picture. A

further dialog box opens to adjust the parameters.

Aging Simulates the effects of time on a picture. Can be

applied several times. A further dialog box will

open to adjust the aging level.

Posterize Makes a picture appear like a painting by reducing

the number of colors used.

Pop Art Modifies the picture dramatically.

Charcoal Displays the image as a charcoal sketch.

Relief A dialog box is displayed to adjust the light source

that in turn will create the shadow and hence the

relief effect.

Mosaic Joins groups of pixels into a single area of one

color.

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