The defaults for -height and -width are the full hw size of the canvas widget so you should just be able to: 

my $ps = $canvas->postscript(  '-pagewidth'  => "8 i" );

[download]

and it will x:y symetrical scale to give a result 8 inches wide and X high. I presume you have tried this? The bbox (bounding box) co-ords are noted in the docs to be *approximate* ie (Returns a list with four elements giving an approximate bounding box for all the items named by the tagOrId arguments) which appears to be what you are seeing.

cheers

tachyon

In reply to Re: Dumping Tk canvas to postscript by tachyon
in thread Dumping Tk canvas to postscript by TooNewbie

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