<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Paulo -<br></div><div><br data-mce-bogus="1"></div><div>>| And hod do you perform the tests? ON PDF or on images made from the PDF's?<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>The latter. I render the PDF into a pixmap, 72 pixels to the inch, and analyze a variety of rectangular areas for non-white pixels.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>Doug McKenna<br data-mce-bogus="1"></div><div>Mathemaesthetics, Inc.<br data-mce-bogus="1"></div><div data-marker="__QUOTED_TEXT__"><br></div></div></body></html>