I need help - I can help - Search for blank space to insert a qrcode

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Search for blank space to insert a qrcode

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=2823
Printed Date: 04 Apr 26 at 10:14PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Search for blank space to insert a qrcode

Posted By: Michi
Subject: Search for blank space to insert a qrcode
Date Posted: 07 Feb 14 at 4:31PM

Hello,

is there way to search in an external pdf (scanned or emailed) for a blank space (eg. 2.5 cm x 2.5 cm) to insert a qrcode?

I don't want to append an empty page with only the qrcode.

Thanks

Michi

Replies:

Posted By: Ingo
Date Posted: 11 Feb 14 at 7:39AM

Hi Michi!

Not as a QuickPDF-function.

You can render a pdf-page to a bitmap

and check the rgb-values of the pixels

in a special range.

If they are all 255/255/255 then it's

white.

If you've scaled down the bitmap before

the performance should be okay.

Cheers and welcome here,

Ingo

-------------
Cheers,
Ingo

Posted By: Michi
Date Posted: 17 Mar 14 at 3:29PM

Hallo Ingo,

good idea!
And not so much work.

But I run into a new problem with empty qrcodes -> next post.

Thanks

Michael