Page Darkness
Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1461
Printed Date: 19 Jan 26 at 4:55AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Page Darkness
Posted By: bb46970
Subject: Page Darkness
Date 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
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Replies:
Posted By: Ingo
Date 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
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Posted By: bb46970
Date 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
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Posted By: Ingo
Date 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
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