convert -transparent white in.png out .png
might do it ..
Oooo close but not quite. Does as expected but doesn't fix the antialiasing. I.E the image exported from dia has a white background with the foreground text etc antialiased to white. I need to antialias the foreground to transparent rather than white.
The -antialias option doesn't fix it either, may not be applying it correctly.
Thanks I'll keep playing. Ideal solution would be for dia to do an "export with transparent background".
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