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OpenOffice Calc 3.x Guide
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Using graphic filters

Click the Filter icon to display the Graphic Filter toolbar, where you can apply basic photographic and effect filters to images from within Calc. You can tear off this toolbar and place it anywhere on the screen.

The graphic filters available in Calc

Table 3: Graphic filters and their effects

Icon Name Behavior
Image:Invert.png Invert Inverts the colors in the picture like a negative.
Image:Smooth.png Smooth Applies a Gaussian Blur to the image which softens edges.
Image:Sharpen.png Sharpen Sharpens the image.
Image:Remnoise.png Remove Noise Applies crude noise reduction.
Image:Solarize.png Solarization Reverses a portion of the tones, then produces pronounced outlines of the highlights.
Image:Aging.png Aging Essentially a Sepia filter.
Image:Posterize.png Posterize Opens a dialog to determine the number of poster colors. This effect is based on the reduction of the number of colors. It makes photos look like paintings.
Image:Popart.png Pop Art Applies a Pop Art style to the image.
Image:Charcoal.png Charcoal Sketch Applies a Charcoal Sketch look to the image.
Image:Relief.png Relief Displays a dialog for creating reliefs. The position of the imaginary light source that determines the type of shadow can be chosen.
Image:Mosaic.png Mosaic Joins small groups of pixels into rectangular areas of the same color. The larger the individual rectangles are, the fewer details the graphic image has.
Image:documentation_caution.png Applying OOo picture filters to any image consecutively will progressively degrade the quality of the image. The picture filters used in Calc utilize what is known as a Destructive Editing algorithm, whereby each filter is applied to the image immediately, changing the original data of the image. Successive transformations result in less and less original data remaining, thus compromising the quality of the inserted picture. While this might be acceptable for use in simple documents, it is still recommended that dedicated photo or image editing software be used to perform anything but the simplest of manipulations.

OpenOffice Calc 3.x Guide
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