As command lines are typically text-based, you need to pass the image data to something that can handle it, e.g. ImageMagick's display command: 

$ ./youscript.pl | display -

[download]

(In case there are issues with autodetecting the image format, you can say something like gif:- instead of just - (the dash stands for stdin). This prefixing is specific to ImageMagick, though)

In reply to Re: Would GD draws in command line by Anonymous Monk
in thread Would GD draws in command line by PhillipHuang

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