But surely rich black 40,0,0,100 or black converted to cmyk from rgb are never
simple 100K
Been an issue we have been dealing with in print for years
Sent while on the move
Begin forwarded message:
> From: Wim Lambrechts <wlambrec...@hotmail.com>
> Date: 5 August 2011 11:14:08 GMT+01:00
> To: <itext-questions@lists.sourceforge.net>
> Subject: [iText-questions] image vs background: color difference in CMYK
> Reply-To: Post all your questions about iText here
> <itext-questions@lists.sourceforge.net>
>
> Hello,
>
> I create a PDF page with background CMYK = 0,0,0,255 (full black). Next I
> create a CMYK image (same CMYK values) and put it onto the page.
> When I open the PDF on screen, this is OK, but when printed, it seems the
> image is "deeper" black than the background.
>
> PS: this issue is related to my previous one.
>
> Creating the background:
> PdfContentByte under = writer.DirectContentUnder;
> under.SaveState();
> under.SetCMYKColorFill(0,0,0,255); //CMYK value for black
> under.Rectangle(0, 0, PageSize.A4.Width, PageSize.A4.Height);
> under.Fill();
>
> Creating the image:
> byte[] gradient = new byte[255 * 4];
> for (int lcv = 0; lcv < 256; lcv++)
> {
> gradient[lcv * 4 + 0] = 0;
> gradient[lcv * 4 + 1] = 0;
> gradient[lcv * 4 + 2] = 0;
> gradient[lcv * 4 + 3] = 255; // (byte)lcv;
> }
> Image result = Image.GetInstance(256, 1, 4, 8, gradient);
> result.ScaleAbsolute(256, 50);
>
> Thanks !
> ------------------------------------------------------------------------------
> BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA
> The must-attend event for mobile developers. Connect with experts.
> Get tools for creating Super Apps. See the latest technologies.
> Sessions, hands-on labs, demos & much more. Register early & save!
> http://p.sf.net/sfu/rim-blackberry-1
> _______________________________________________
> iText-questions mailing list
> iText-questions@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/itext-questions
>
> iText(R) is a registered trademark of 1T3XT BVBA.
> Many questions posted to this list can (and will) be answered with a
> reference to the iText book: http://www.itextpdf.com/book/
> Please check the keywords list before you ask for examples:
> http://itextpdf.com/themes/keywords.php
------------------------------------------------------------------------------
BlackBerry® DevCon Americas, Oct. 18-20, San Francisco, CA
The must-attend event for mobile developers. Connect with experts.
Get tools for creating Super Apps. See the latest technologies.
Sessions, hands-on labs, demos & much more. Register early & save!
http://p.sf.net/sfu/rim-blackberry-1
_______________________________________________
iText-questions mailing list
iText-questions@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/itext-questions
iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
to the iText book: http://www.itextpdf.com/book/
Please check the keywords list before you ask for examples:
http://itextpdf.com/themes/keywords.php
