ACS ACS-24UHF/Eagle, Руководство пользователя

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Next, click on the Background Color box and a window will open. Select a different color, for example, red:

The parts of the image that will be traced changes:

This can be used to identify and trace different parts of an image. However, with the newer Alpha, Palette ,
and Colo r options available, this feature may not ever be something you need.
6.03.2 Alpha Trace Method

Use the Alpha Trace for PNG files with transparent backgrounds (alpha channels). To switch to the Alpha
Trace method, click on the tab named Alpha and following will appear:
Default values
Background Color
default is white
Click on another color
from palette.
Click on OK
Changing the
Background Color to
red is the only change
made.