Text too Faint on Render

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   When I open a file in Acrobat Viewer full screen, the text is bold and legible, but when I render the image onto a full screen (same size) DC, the text is very light and faint. I have tried adjusting the SetGDIPlusOptions, but have not found any that make the page look any closer to the Adobe view.
Does anyone have experience with this problem? 

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oberon232 Members Profile Find Members Posts Beginner Joined: 13 Feb 14 Location: Florida Status: Offline Points: 5	Post Options Post Reply Quote oberon232 Report Post Thanks(0) Quote Reply Topic: Text too Faint on Render Posted: 13 Feb 14 at 11:07PM
	When I open a file in Acrobat Viewer full screen, the text is bold and legible, but when I render the image onto a full screen (same size) DC, the text is very light and faint. I have tried adjusting the SetGDIPlusOptions, but have not found any that make the page look any closer to the Adobe view. Does anyone have experience with this problem?

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 14 Feb 14 at 11:45PM
	Oberon, This is most likely related to the PDF file itself. We would need to see the PDF file in order to make further comments. You can either post a download link here or can create a support case by emailing support@debenu.com The upcoming Debenu Quick PDF Library 10.13 version will include an improved rendering engine and may improve the rendering results. Andrew.

oberon232 Members Profile Find Members Posts Beginner Joined: 13 Feb 14 Location: Florida Status: Offline Points: 5	Post Options Post Reply Quote oberon232 Report Post Thanks(0) Quote Reply Posted: 17 Feb 14 at 2:24PM
	One of the files I have posted for review. http://96.237.50.19/Andrew/1128618277.pdf

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 18 Feb 14 at 12:26PM
	Oberon, Have you tried using QP.SetGDIPlusOptions(3, 1); // Turn on image smoothing Do we assume you are using the RenderPageToDC function ? Are you rendering to a local DC or to a Remote Desktop or terminal server DC ? Andrew. Edited by AndrewC - 18 Feb 14 at 12:29PM

oberon232 Members Profile Find Members Posts Beginner Joined: 13 Feb 14 Location: Florida Status: Offline Points: 5	Post Options Post Reply Quote oberon232 Report Post Thanks(0) Quote Reply Posted: 21 Feb 14 at 3:56PM
	I am rendering to a bitmap in a memory stream, and then sending that as the source of a picture box. I originally did the methodology of rending to DC, but the picture box allows me to scroll and zoom simply by changing the dimension of the picture box in the form. I have tried QP.SetGDIPlusOptions(3, 1);

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 22 Feb 14 at 4:52AM
	Oberon, What DPI are you using to render to the Bitmap ? Can you post a sample screen shot of what is currently being output ? I use RenderPageToFile and 100, 200 and 300 dpi with QP.SetGDIPlusOptions(3, 1); and do not see any real quality issues with your PDF file. RenderPageToDC will produce better results as is use the native DPI and pixels available. Converting it to a bitmap will lose some definition as the image then needs to be rescaled to fit in the picturebox. So it is not a fair comparison to compare Acrobat to a scaled PictureBox image especially if the PictureBox is doing anything but 1:1 scaling. Andrew.

oberon232 Members Profile Find Members Posts Beginner Joined: 13 Feb 14 Location: Florida Status: Offline Points: 5	Post Options Post Reply Quote oberon232 Report Post Thanks(0) Quote Reply Posted: 24 Feb 14 at 3:38PM
	Here's the code I use Private Sub ShowPageInControl(ByRef ctrl As Control) Dim bmpData() As Byte Dim ms As IO.MemoryStream Dim bmp As Bitmap QP.SetGDIPlusOptions(3, 1) bmpData = DirectCast(QP.RenderPageToVariant(200, CurrentPage, 0), Byte()) ms = New IO.MemoryStream(bmpData) bmp = New Bitmap(ms) bmp.Save(ms, ImageFormat.Png) PictureBox1.Image = bmp ms.Dispose() End Sub And here is the screen capture http://dblinc.no-ip.com/andrew/screenCap.jpg

AndyD Members Profile Find Members Posts Senior Member Joined: 30 Apr 13 Location: UK Status: Offline Points: 54	Post Options Post Reply Quote AndyD Report Post Thanks(0) Quote Reply Posted: 24 Feb 14 at 6:08PM
	Oberon, a quick question out of curiosity really, why are you rendering this anyway and not leaving it as a pdf?

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 25 Feb 14 at 7:49AM
	Hi Andy, he wants to build his own simple pdf-reader ;-) Cheers, Ingo
	Cheers, Ingo

AndrewC Members Profile Find Members Posts Moderator Group Joined: 08 Dec 10 Location: Geelong, Aust Status: Offline Points: 841	Post Options Post Reply Quote AndrewC Report Post Thanks(0) Quote Reply Posted: 09 Mar 14 at 1:56PM
	Oberon, There is a 2nd conversion going on when you scale the image inside the PictureBox which would not be helping things. You would get better results using RenderPageToDC as there would be less scaling operations involved or to use the new Debenu ActiveX renderer released alongside version 10.13 of Debenu PDF Library. http://www.debenu.com/products/development/debenu-pdf-viewer-sdk/ The other issues are the fact that Acrobat has a special function to enhance thin lines which is not easy to replicate when using GDI+ or our new rendering engine. Acrobat has spent millions of dollars developing, fine tuning and optimising their rendering engine. Andrew.