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Commands:
<ul>
<li> transparent, no more args: interactive way for the user to specify the transparent color by a click
<li> transparent, idpath, #rrggbb: specify transparent color
<li> transparent, idpath, px, py: specify transparent color by pixel coordinates within the pixmap
<li> resize, no more args: interactive resizer where the user clicks on two points of the pixmap on screen and specifies the real disatnce between them and the code resizes the pixmap to match that
<li> resize, idpath, pdx, pdy, len: resize pixmap so that pixel distance pdx;pdy will match len coord units
</ul>
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