http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 17:16:51 +0000 Mon, 31 May 2010 06:34:00 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=1461 http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ http://www.quickpdf.org/forum/page-darkness_topic1461_post6573.html#6573 Author: Ingo
Subject: 1461
Posted: 31 May 10 at 6:34AM

Hi David!

You can check each pixel regarding the rgb-value ...
If have it in one of my codes but not yet accessable.
The other point of view is: Checking megabytes of pixels lasts a long time.
My idea: Make something like a big thumbnail of each page and check these pixels ;-)

Cheers, Ingo
 
]]> Mon, 31 May 2010 06:34:00 +0000 http://www.quickpdf.org/forum/page-darkness_topic1461_post6573.html#6573 http://www.quickpdf.org/forum/page-darkness_topic1461_post6572.html#6572 Author: bb46970
Subject: 1461
Posted: 30 May 10 at 11:41PM

Ingo,

The PDFs are scanned; so, every page is an image, even if it is a blank page (blank image).  Any suggestions on measuring each pixel in the image to determine how what percentage of the pixels are not white or close to white?

Thanks,

David
]]> Sun, 30 May 2010 23:41:32 +0000 http://www.quickpdf.org/forum/page-darkness_topic1461_post6572.html#6572 http://www.quickpdf.org/forum/page-darkness_topic1461_post6571.html#6571 Author: Ingo
Subject: 1461
Posted: 30 May 10 at 7:09PM

Hi David!

"Does QuickPDF have a way of determining the page darkness for an existing PDF?"
Short answer: No ;-)

But... You could do a textextration AND a search for image objects. If both results are negative then the page should be blank?

Cheers, Ingo

]]> Sun, 30 May 2010 19:09:42 +0000 http://www.quickpdf.org/forum/page-darkness_topic1461_post6571.html#6571 http://www.quickpdf.org/forum/page-darkness_topic1461_post6570.html#6570 Author: bb46970
Subject: 1461
Posted: 30 May 10 at 5:00AM

Dosadi has a dll for scanning documents into PDFs.  As part of the scanning, it will measure the overall page darkness and, based upon a specified threshold percent, assume that a page is blank, and remove those pages.  Does QuickPDF have a way of determining the page darkness for an existing PDF?  I want to process existing PDFs and identify pages that may be blank.

Thanks,

David
]]> Sun, 30 May 2010 05:00:21 +0000 http://www.quickpdf.org/forum/page-darkness_topic1461_post6570.html#6570