Page Darkness

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   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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bb46970 Members Profile Find Members Posts Team Player Joined: 06 Mar 06 Status: Offline Points: 33	Post Options Post Reply Quote bb46970 Report Post Thanks(0) Quote Reply Topic: Page Darkness 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

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply 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

bb46970 Members Profile Find Members Posts Team Player Joined: 06 Mar 06 Status: Offline Points: 33	Post Options Post Reply Quote bb46970 Report Post Thanks(0) Quote Reply 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

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3530	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply 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