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The selection list for replacement colors shows all the available colors in the current
color palette of the document. You cannot define any new colors here but you can add
colors to the available palette before using the eyedropper tool. For more on this
topic, see Chapter 8 (Tips and Tricks).
Effect of the tolerance parameter
The tolerance parameter describes how closely a color value in the picture must
agree with the source color in order to be replaced. In the figure below, the red color
tone at the left edge of the rectangular color palette is used as the source color and a
pure blue as the replacement color with several different tolerances. The original is a
rectangle with color palette from red to green. Because the eyedropper is not usable
on drawings, the rectangle on the left side was converted into a raster graphic
(Convert > Bitmap). The picture was then exported in a Enhanced Metafile format
and inserted on the right for comparison.
Note
As shown, the application of transparency and color replacement effects
on raster graphics and Metafiles leads to quite different results. This is a
known problem, which will be corrected in a future version.
Color depth
It is possible to reduce the color depth in OOo. The tools are available but you must
create a separate menu and add the tools to the menu if you wish to have them
available (refer to OOo help if you are not sure how to do this). To find the tools, click
on Tools > Customize, Toolbars, and Add (Command). The commands are in the
category Modify, at the top of the list.
Reducing color depth
Original with a 24 bit pixel depth (=8 bits per
channel)
Chapter 6 Editing Pictures (Raster Graphics) 103
Original
0% smallest value
99% largest value
80%
40%
20%
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