How to download an image without its background

[gilis]

Hi,

In my experiment I use flankers. One of those should appear in the
center of the display, in the middle of the stimulus. It have to be
transparent obviously so the stimulus could be seen fully. The problem
is that I can't create flanker image which contain only the flanker
itself, without background. So it maens that the flanker has
background (white) which cover part of the stimulus.

I was thinking that maybe there is away to insert inline command that
will upload the flanker image from the folder-but with out the
background. Meaning that it will upload anything that is not white. I
just don't know how to do that, I assume that it's involved with
canvasing.

Would be very very grateful for help on this.

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