I need help - I can help - Printmarks in every single color channel

Printmarks in every single color channel

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=3389
Printed Date: 30 Apr 24 at 5:01PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Printmarks in every single color channel

Posted By: martin.weigl
Subject: Printmarks in every single color channel
Date Posted: 15 Sep 16 at 1:14PM

Hello,

i need to draw print marks in every single color channel in my PDF.

Background:

i generate a PDF programmatically in order to have this PDF passed on to printing offices. The PDFs contain the color channles C,M,Y and K and addtitionally some separation color channels.

I was told that every single color channel should have the exact same print mark embedded so that the press rooms are able to print "their" content to the exact positions.

I can render the printing mark (a cross and a circle) to the color channels C,M,Y and K, but when i print them again to the separation color channels, everything printed before is overwritten.

i found some functionalities concerning "streams" (formerly handled as "layers") which seemed to be what i was looking for.

Unfortunately, the behaviour (previously printed print marks are overwritten) still remains the same.

What can i do to place the print mark into every color channel at the exactly same Position?

Regards,

martin

Replies:

Posted By: martin.weigl
Date Posted: 26 Sep 16 at 8:38AM

Does nobody have an idea how to place something (i. e. lines, circles, etc.) in every color channel of a PDF?

By calling the method

.SetLineColorCMYK(double, double, double, double)

i can draw a line into the four color channels "Cyan", "Magenta", "Yellow" and "Black" at a time. But how can i draw the same line into other (separation) color channels that i have defined before by calling

.AddSeparationColor(string, double, double, double, double)

without loosing the lines i have drawn before into the other color channels?

Please help,

Martin

Posted By: martin.weigl
Date Posted: 16 Sep 19 at 2:45PM

OK, I finally found the solution myself. For others, who might have the same problem - the magic function is SetOverprint(...) which tells the library to not only replace existing content, but print new content over it which results in content with color saturation values > 100%.

Hth,

Martin