I have some code that watermarks one image on top of other.

How would I go about using java to set a certain color in an image to
be transparent?

For example, let's say I have a 640x480 photograph, and I want to
watermark it with a logo.  But the logo is on a white background... so
I'd like to cause the white pixels to be transparent for the purposes
of watermarking the logo onto the photograph.

Thanks.

Rick

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