Debenu Quick PDF Library - PDF SDK Community Forum : Problem using QuickPDFRenderPageToFile with PNG http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 27 Jul 2026 13:47:42 +0000 Mon, 11 Apr 2011 09:08:16 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=1796 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[Problem using QuickPDFRenderPageToFile with PNG : I am guessing the PDF developer...]]> http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7778.html#7778 Author: AndrewC
Subject: 1796
Posted: 11 Apr 11 at 9:08AM


I am guessing the PDF developer of this PDF file made a wrong assumption and used 4544 x 4064 as the width and height.  The image in this file is actually 4544 x 4064 pixels in size so I am pretty sure this is why the page dimensions are wrong and why the image is so big.

The pageWidth/pageHeight are normally measured in points (72 points = 1 inch) and so the 4544 x 4064 needed to be scaled to points. ie.  1090 x 975.  This image is 300 dpi so 4544 / 300 * 92 = 1090 and 4064 / 300 * 72 = 975.

Using QPL to Render this file with the invalid page size consumed a 1 GB of memory.  It did render ok on my 8GB machine.  So some of the other ideas to render large files would be useful.

Andrew.
]]> Mon, 11 Apr 2011 09:08:16 +0000 http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7778.html#7778 <![CDATA[Problem using QuickPDFRenderPageToFile with PNG : Pedro,Why don&#039;t you use a...]]> http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7777.html#7777 Author: darkv
Subject: 1796
Posted: 08 Apr 11 at 11:14PM

Pedro,

Why don't you use a Windows DC to clip your image (or a part of), and then you "band" your image to reduce the size you have to deal with (as printer does when it process a big file)

When you create the DC you can define the resolution for your device.

My fear is memory consumption for such an image, but could be a workaround.

please find below part of a vb.net code i used.

Hope this helps

Rgds


 Dim bmp As New Bitmap(iPw, iPH, System.Drawing.Imaging.PixelFormat.Format32bppArgb)
 gDisp = Graphics.FromImage(bmp)
 hDCd = gDisp.GetHdc
  '
 lRtn = zPdf.RenderPageToDC(72, 1, hDCd)   ' DPI settings

Ps : dont forget to ".release" and ".dispose" variables ;-)

]]> Fri, 08 Apr 2011 23:14:59 +0000 http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7777.html#7777 <![CDATA[Problem using QuickPDFRenderPageToFile with PNG : Greetings Ingo,First of all, let...]]> http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7774.html#7774 Author: PedroLamas
Subject: 1796
Posted: 08 Apr 11 at 10:38AM

Greetings Ingo,

First of all, let me thank you for your reply! :)

I know the original page is 4544x4064, but I really need it at 150dpi because this page (and others a little less "noisy") will be used for OCR/ICR, and 150dpi is the minimum DPI's we need to get an accurate result!
The problem is that if I output it as a BMP at 150dpi, it creates a file bigger that 200Mb, as for PNG the file will be at max 10Mb!

I'll make a post for a bug in the official support pages (I thought this was it, though, sorry!!)

Regards, Pedro Lamas
]]> Fri, 08 Apr 2011 10:38:37 +0000 http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7774.html#7774 <![CDATA[Problem using QuickPDFRenderPageToFile with PNG : Hi Pedro!The page size from your...]]> http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7772.html#7772 Author: Ingo
Subject: 1796
Posted: 07 Apr 11 at 6:40PM

Hi Pedro!

The page size from your pdf is 4544 x 4064 pixels.
A "normal" page size is 842 x 595 means (in german DIN A4).
with 72 dpi the size will be the same - with 100 or 150 it will be larger.
Seems that the included png-routines are not made for images with a size about 1.4 x 1.6 meters ;-)
If you're the meaning that this is a bug you should post it at the official support pages.

Cheers, Ingo



]]> Thu, 07 Apr 2011 18:40:43 +0000 http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7772.html#7772 <![CDATA[Problem using QuickPDFRenderPageToFile with PNG : Greetings,I&#039;m new to your...]]> http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7771.html#7771 Author: PedroLamas
Subject: 1796
Posted: 07 Apr 11 at 2:48PM

Greetings,

I'm new to your forum, but the company I work on has bought and been using QuickPDF for a while now, always with full success!! :)

But yesterday, I came up with a problem: I have a file that I need to output its pages to PNG at 150dpi, but this seems to throw an exception (I'm using .NET 4.0 with Interop to QuickPDF 0724)

If I use:

QuickPDFRenderPageToFile(instanceID, 150, 1, 5, fileName); //PNG at 150dpi

this will raise an exception, but the following commands will work ok:

QuickPDFRenderPageToFile(instanceID, 100, 1, 5, fileName); //PNG at 100dpi 
QuickPDFRenderPageToFile(instanceID, 150, 1, 0, fileName); //BMP at 150dpi
QuickPDFRenderPageToFile(instanceID, 150, 1, 1, fileName); //JPEG at 150dpi
QuickPDFRenderPageToFile(instanceID, 150, 1, 7, fileName); //TIFF at 150dpi

Can you help me with this one please? :)

You can get the file I'm using that gives this problem here:
http://cid-b26d27fb6d61bde4.office.live.com/self.aspx/Public/d5514f41-5d7f-400a-837e-129041f480ee^_001.pdf

Best regards and please keep up with your good work!!!

Pedro Lamas
]]> Thu, 07 Apr 2011 14:48:07 +0000 http://www.quickpdf.org/forum/problem-using-quickpdfrenderpagetofile-with-png_topic1796_post7771.html#7771