OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 102

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Practical example: Changing wrong colors to transparency
Some applications, which cannot correctly handle transparency, show transparent
areas with the color Magenta and then store the graphic with this color and without
the correct transparency information.
Bitmap graphic with area in magenta, which actually should be
shown transparent. On the left is the original picture, right is the
picture after saving it with MS Paint.
If you receive such a picture, you can recreate the transparency with the eyedropper
tool.
Open the Eyedropper dialog with Tools >
Eyedropper and click on the picture to be
edited.
Now click on the icon , to change to the
color selection mode. Outside the dialog the
cursor changes to a hand. The field next to
the icon shows the color immediately under
the hand cursor.
Click on the color to be changed. The first
Source Color box is now marked and the
color selected appears in the left box. In the
Replace with selection list, the option
Transparent is already selected. Click on
the Replace button at the top right of the
box to carry out the changes to the picture.
There is no preview of the effect. If the
result is not what you wanted, choose Edit
> Undo.
The dialog does not close automatically, so you can carry out further color
replacements. Mark first the field for the Source color and choose again the color
with the eyedropper. Close the dialog with Ctrl+F4 or the Close icon on the window
border. Draw uses a separate Alpha channel for transparency so that pixels of
different colors can be made transparent.
It is also possible to carry out the operation in reverse to change a transparent area
to a color. Select nothing in the graphic but choose the Transparency option at the
lower left of the dialog and the replacement color at the lower right.
102 OpenOffice.org 3.3 Draw Guide
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