PDFsharp & MigraDoc Foundation

How can i make the color images,black and white(grey scale),in PDFSharp?
Have any idea.

Hi!

Convert color images to gray scale using .NET functions before you pass them to PDFsharp.

_________________
Regards
Thomas Hoevel
PDFsharp Team

Can you suggest good piece of code for it.

Do you have a recommended process for converting an entirely color PDF into a black and white PDF using PDFSharp?

I know this is basic but having trouble finding the information.

Thanks,

John

Hi, John!
I don't know how to do that.
Maybe a PDF expert can shed some light ...

_________________
Regards
Thomas Hoevel
PDFsharp Team

As far as I know, this is not basic at all. You would have to process the contents of each page, looking for colour operations, and change those to equivalent operations using greyscale (or even black & white). Also, you would need to replace each image with a greyscale version and update the ColorSpace entry in its metadata. As PdfSharp does not provide access to inline images, you cannot convert those at the moment.

For starters, you could try http://greyscalepdf.com/ and see what it changes in the processed PDF. It apparently uses Ghostscript for the conversion. But I've noticed that that site does not always convert everything to greyscale; sometimes it leaves a bit of colour.

_________________
Gerben Vos
Developer

I thought PDFSharp listed it on its old site but I don't see any documentation/support for this feature.

Someone else said there's a Windows library that does the conversion apart from PDF.

Not sure...