C++ & Tcl/Tk image -> Gif/Jpeg

Looking for a way to convert an image in an Tcl/Tk canvas to a gif or jpeg image for an export to a  Web Page...I have to code it in either C++ or Tcl/Tk code.
fprefectAsked:
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q2guoCommented:
Hi fperfect

The best way to do this would be to save the image in the Tcl/tk canvas to postscript.  And spawn ghostscript to convert  the postscript file to a gif file.
I assume you have ghostscript installed on your machine.
command 'gs -h' gives cursory help.

Generate postscript for the canvas is remarkablely simple.
For example, to generate a postscript file for a canvas named .drawing.
you would write
.drawing postscript

If you need further help, please let me know.
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