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GemBox Support Forum

Add image to PDF Signature appearance? Change text color?

GemBox.Pdf
#1

Hello,

I try GemBox.Pdf to digitally sign pdfs.
I get it worked using a Belgian electronic ID Card (pkcs11) thanks to your digital signatures example.

But I’m missing 2 things:

  1. I didn’t find a way to add an image to the signature field appearance. Is it possible?
  2. I want to customize the text color on the signature field, is there a way to do it?

Thanks
Whiletrue

#2

Hi Whiletrue,

Regarding the text color, please try using this latest version from our BugFixes page or NuGet.

We have added the PdfSignatureAppearance.FontColor property, you can use it like this:

PdfSignatureField signatureField = ...

// Get signature appearance settings.
PdfSignatureAppearance signatureAppearance = signatureField.Appearance;

// Set font family to "Times New Roman".
signatureAppearance.FontFamily = new PdfFontFamily("Times New Roman");

// Set font color to red.
signatureAppearance.FontColor = PdfColor.FromRgb(1, 0, 0);

// ...

Regarding the signature image, GemBox.Pdf currently doesn’t provide an easy-to-use API for adding images.
But note that we’re working on this, this feature should be available in the near future (within a month or two).

For now as a workaround, I could provide you a solution that uses GemBox.Document to create any kind of visual appearance that you want (both text and image) which you would then add to a signature field using GemBox.Pdf.
Let me know if you’re interested in this.

Regards,
Mario