http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 04 May 2026 12:30:47 +0000 Mon, 22 Mar 2010 11:50:09 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=1378 http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6265.html#6265 Author: nzcivic
Subject: 1378
Posted: 22 Mar 10 at 11:50AM

Hi,

I have noticed that the GetPageText function returns the color in RGB even though my text in the PDF is saved as CMYK

What is the best way to convert the RGB to CMYK?

I use the following function below... but what I would like to know is the function used by Quick PDF to convert CMYK to RGB? that way it can be reversed to preserve color

    public class Cmyk
    {
        public double C { get; set; }
        public double M { get; set; }
        public double Y { get; set; }
        public double K { get; set; }

        public Cmyk(double r, double g, double b)
        {
            double R = 1.0 - r;
            double G = 1.0 - g;
            double B = 1.0 - b;

            if (R < G)
            {
                K = R;
            }
            else
            {
                K = G;
            }
            if (B < K)
            {
                K = B;
            }

            C = CalcCmyk(r, K);
            M = CalcCmyk(g, K);
            Y = CalcCmyk(b, K);
        }

        private static double CalcCmyk(double rgb, double k)
        {
            if (((1 - rgb - k) <= 0) || ((1 - k) <= 0))
            {
                return 0;
            }
            return (1 - rgb - k) / (1 - k);
        }
    }

Will this preserve the color 100%

Thanks,
]]> Mon, 22 Mar 2010 11:50:09 +0000 http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6265.html#6265 http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6258.html#6258 Author: Ingo
Subject: 1378
Posted: 22 Mar 10 at 7:18AM

Hi!

You can't edit the textcontent directly.
You can extract the text and many pdf-properties, edit the extracted text and try to build a similar pdf-document.
"If so... how": Here, in the general section you can find a thread "The first steps...". There you can read all you need.

Cheers and welcome here,
Ingo
]]> Mon, 22 Mar 2010 07:18:12 +0000 http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6258.html#6258 http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6257.html#6257 Author: nzcivic
Subject: 1378
Posted: 22 Mar 10 at 1:30AM

Hi,

I want to be able to find and edit text on a page...

I understand I can use the GetPageText to find the text I'm after, Now that I have the location etc... i need to edit the text.

What is the best way...

Can the text be edited directly?

Can I recreate a new PDF with all the existing content except the "text" and then draw my new text? If so how?

Thanks,


Edited by nzcivic - 22 Mar 10 at 1:34AM]]> Mon, 22 Mar 2010 01:30:46 +0000 http://www.quickpdf.org/forum/edit-pdf-text_topic1378_post6257.html#6257