TRANSPARENT="Y"

allows any white parts of a file to appear transparent (default).
Note that some file formats apply a white background on which to place the file content, which negates the effect.

or

TRANSPARENT="N"

places the file content on a white background.

Try the Element IDF sample script to see the effect using an image file.

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Links:

Element GROUP

Element PAGE

Element FILE

ALPHA

COLOR

MONOCHROME

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