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Changing the graphics mode

Use the graphics mode drop-down list in the Picture

toolbar to change the mode of the image. Choose between:

• Default: no changes to the graphic object.

• Grayscale: the image is converted to scales of gray.

• Black/White: each pixel of the image is converted to black or

white depending on the brightness value.

• Watermark: adjusts the brightness of the image making it

suitable to be used as a watermark. For more information on

inserting watermarks in the presentation, refer to Chapter 2.

Adjusting the color

Clicking the color adjustment button on

the Picture toolbar opens the color adjustment

dialog box, shown in Figure 63.

Use this dialog box to modify the individual

color components of the image (red, green,

blue) as well as the brightness, contrast, and

gamma of the image. If the result is not

satisfactory, press Control+Z to restore the

default values.

Increasing the gamma value of a picture

makes it more suitable to be used as a

background or watermark as it will interfere

less with a dark text.

Setting the object transparency

Modify the percentage value in the Transparency box on the

Picture toolbar to make the image more transparent. Note that this is

different from the transparency settings for a line or a shape

(described in Chapter 5). As for the gamma value, increasing the

transparency of a picture makes the picture blend more smoothly in

the background, making the overlay text easier to read.

Adjusting the line, area and shadow settings

These settings are not very commonly used for images, with the

exception of the shadow setting that applies a shadow to the image.

98 OpenOffice.org 3.2 Impress Guide

Figure 63: The color

adjustment dialog box

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OpenOffice.org OpenOffice - 3.2 Betriebsanweisung Seite 98