http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 19:35:07 +0000 Wed, 25 Mar 2015 11:41:49 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3094 http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ http://www.quickpdf.org/forum/imported-image-resolution_topic3094_post12411.html#12411 Author: MarcoAbbate
Subject: 3094
Posted: 25 Mar 15 at 11:41AM

SOLUTION FOUND !!!
The problem is due to the fact that in any case the imported image is managed as it would have a resolution of 72 DPI.
In this case the PDF page takes its dimensions according to this wrong assumption.
To solve the problem it is mecessary to apply a scale factor from the default wrong 72 DPI resolution to the right one:

Note DPIres is the real image resolution...

            double ImageWidthInPoints = (double)QP.ImageWidth() / dpix * DPIres;
            double ImageHeightInPoints = (double)QP.ImageHeight() / dpiy * DPIres;
            int pW=QP.ImageWidth();
            int pH= QP.ImageHeight();
            QP.SetOrigin(1);
            i = QP.DrawImage(0, 0, pW, pH);
            float stdRes = 72;
            float PageScale = stdRes / DPIres;
            QP.SetPageDimensions((pW * PageScale), (pH * PageScale));
            QP.FitImage(0, 0, (pW * PageScale), (pH * PageScale), 0, 0, 0);
            i = QP.SaveToFile(filePDF);
]]> Wed, 25 Mar 2015 11:41:49 +0000 http://www.quickpdf.org/forum/imported-image-resolution_topic3094_post12411.html#12411 http://www.quickpdf.org/forum/imported-image-resolution_topic3094_post12409.html#12409 Author: MarcoAbbate
Subject: 3094
Posted: 24 Mar 15 at 9:15AM

Hi everybody!
I'm facing a strange behaviour importing images using the function "DrawImage".
I have a JPEG image with a resolution on 150DPI.
Its dimensions are 404x275 mm.
When I import the image, the PDF page has the dimensions of 841.7x573.3 mm.
After some tests I found the dimensions of the PDF page are equal to the image dimesions IF THE IMAGE WAS AT 72DPI...
I tried to set the correct dimensions as follows, even if some functions are redundant:

            int pW=QP.ImageWidth();
            int pH= QP.ImageHeight();
            QP.SetPageDimensions(pW ,pH);
            QP.SetImageResolution(150, 150, 2);
            QP.FitImage(0, 0, pW, pH, 0, 0, 0);
            QP.SetOrigin(1);
            i = QP.DrawImage(0, 0, pW, pH);
            i = QP.SaveToFile(filePDF);

But I always get the same wrong dimensions (841.7x573.3 mm) in the output.
I tried to import JPEG, TIFF and BMP image, always with the same wrong result.
Note the images by themselves are correct, with the right ( 404x275 mm).
Do you have any hint or solution about this issue?
Thank you very much in advance!
Marco.

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