itextsharp color picker for a area

Question

I needed to insert some text (a ID) in a location on a PDF file.This task was simple enough but I'm running in to an issue when there is color under the font location.

I need to test to see what color(if any) is under a defined area. Then determine if the font color should be Black or White.

I found a great routine Here (on StackOverflow). to help determine what color to use based on a color you send it. I was hoping to see if there was anyway to find that information out using ITextSharp.

any help would be great!

Essentially you'll have to render the PDF page section in question and check the color of the rendered image. — mkl, Jul 20 '15 at 20:38

score 0 · Accepted Answer · edited May 23 '17 at 12:34

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The short answer is no. The color that a human eye would perceive at any specific x,y coordinate falls under the realm of a PDF renderer which iText is not.

If I were you I would use Ghostscript to convert the PDF to an image such as a PNG or JPEG and then load that into a System.Drawing.Bitmap object and call GetPixel

edited May 23 '17 at 12:34

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answered Jul 20 '15 at 20:38

Chris Haas

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Is there any to export a section of a pdf to a image? – Mike Jul 20 '15 at 20:49
Probably, but it would be way easier to just perform two passes, PDF to bitmap (JPEG, PNG, etc) and then crop it. – Chris Haas Jul 21 '15 at 13:18

itextsharp color picker for a area

1 Answers1