I need help - I can help - Quality of rendered PDF is not good

Quality of rendered PDF is not good

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=2730
Printed Date: 11 May 24 at 9:15AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Quality of rendered PDF is not good

Posted By: hansjoergp
Subject: Quality of rendered PDF is not good
Date Posted: 11 Sep 13 at 9:16AM

Hello,

we use the quickpdf library to display pdfs on the screen (.net application).

For some pdfs (they are coming from a scanner) the quality is really bad (with acrobat Reader the PDF is okay).

Which possibility we have to make the quality better?

We use this code:

Bitmap DrawPdfPage(int page, int width, int height)

{

var pw = pdf.PageWidth() / 72.0;

var ph = pdf.PageHeight() / 72.0;

int renderDpi = 72;

renderDpi = (int)Math.Min(width / pw, height / ph); // fit both

//renderDpi = (int)(width / pw);

//renderDpi = (int)(height / ph);

width = (int)(renderDpi * pw);

height = (int)(renderDpi * ph);

Bitmap bitmap = new Bitmap(width, height);

if (page > 0 && page <= pdf.PageCount())

{

using (var g = Graphics.FromImage(bitmap))

{

IntPtr dc = g.GetHdc();

pdf.RenderPageToDC(renderDpi, page, dc);

g.ReleaseHdc(dc);

}

return bitmap;

}

Best regards

Hansjoerg

Replies:

Posted By: AndrewC
Date Posted: 12 Sep 13 at 10:59AM

Hansjoerg,

Can you try adding the following line to you program somewhere after QP.UnlockKey.

QP.SetGDIPlusOptions(3, 1); // Turn on image smoothing

Andrew.

Posted By: hansjoergp
Date Posted: 16 Sep 13 at 7:56AM

Thanks it works