The background mask area is the area in the image, that does not get
moved or animated during playback of the animation script. Click Background Mask Editing
to modify this background mask. The background mask, also
known as the alpha channel, controls the transparency of TGA images.
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Click Full
and click the image to assign a key color to fill the mask area, you
can drag the Tolerance slider to increase or decrease the the background mask over the complete image
area.
Click Clear
to delete the background mask.
Click Inverse
to invert the background mask area. The area that
was previously selected as the background mask is now used for animation
whereas the previously animated area is converted into the background
mask area.
Use the Brush
Tool to specify whether you want to increase or decrease the background
area. Click Increase
if you want to enlarge the background area or add more parts
to it. Click Decrease
to erase parts of the background mask.
Adjust the Brush Size slider to increase or decrease the size of the brush tool. Use a thinner size when you want to change only small areas of the background mask. Alternatively, enter a number in the box next to the slider to specify the brush size.
Click Mask Color to specify the color for the background mask using the color palette. The mask color does not actually show up on the model; it is for your reference only.
Move the Opacity slider bar to specify the opacity of the background mask. The mask opacity does not actually show up on the model; it is for your reference only.
Move the Contract/Expand slider bar to contract or expand the background mask.
Move the Blur slider bar to blur the background mask.
Click Preview to view the results of your editing.
PNG image with alpha channel
Alpha channel
in the Background Mask Editing panel