OpenOffice.org OpenOffice - 3.3 Základní průvodce stáhnout pdf (Strana 126)

Icon Name Behavior

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.

Caution

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.

Adjusting colors

Use the Color toolbar to adjust an image’s red, green, and blue

channels independently, as well as its brightness, contrast and

gamma.

Setting transparency

Modify the percentage value in the Transparency box on

the Picture toolbar to make the image more transparent. This is

particularly useful when creating a watermark or when wrapping an

image in the background.

Customizing lines, areas, and shadows

The Line, Area, and Shadow icons open dialogs where you can customize these

elements. Details are in the Draw Guide.

Cropping pictures

When you are only interested in a section of the image for the purpose of your

document, you may wish to crop (cut off) parts of it. The user interface in Calc for

cropping an image is not very friendly, so it may be a better choice to use a graphics

package.

Click the Crop icon to open a dialog where you can select which portion of the

image you want to remove.

It is not possible to use the mouse to select the area to be cropped, as you can in

Draw. Instead, in the Crop dialog, specify how far from the top, bottom, left and right

borders of the image the crop should be, as illustrated in Figure 114. On the

thumbnail in the figure, notice that the cropped selection is highlighted with an inner

rectangle.

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OpenOffice.org OpenOffice - 3.3 Základní průvodce Strana 126