Comment 5 for bug 449647

I had the same issue, the problem is in drawInlineImage function, if no width and height are given the default pdf resolution of 75 dpi is taken (1 pixel per pt).

I patched the drawInlineImage call in hp-scan (2 times) from:

                    c.drawInlineImage(image, (tlx/0.3528), ((bry_max/0.3528)-(bry/0.3528)),

                    #c.drawInlineImage(image, 0, bry/0.3528,
                        width=None,height=None)

to:
                   c.drawInlineImage(image, (tlx/0.3528), ((bry_max/0.3528)-(bry/0.3528)),
                        width=((brx-tlx)/0.3528),height=((bry-tly)/0.3528))

And it now seems to be working (better).