I found a writeup of the 50% Y dimension problem at
http://forums.oracle.com/forums/thread.jspa?threadID=1269908
<http://forums.oracle.com/forums/thread.jspa?threadID=1269908&tstart=90>
&tstart=90. It seems some fax machines use a 2:1 pixel ratio and image
viewing programs such as Irfanview and Photoshop will automatically “correct”
the aspect ratio, whereas others such as MS Paint do not. When I pull up the
fax machine image in Paint, it appears squashed like my itext converted PDF.
The image is not correct in the sense that it does not reflect what has been
faxed, the likely culprit is my fax software that creates the TIFF. So my
solution is to add some code to my fax conversion process that will examine the
dimensions of the TIFF and apply aspect ratio correction (essentially a square
pixel), then set the scaling accordingly.
Steve
From: Paulo Soares [mailto:[email protected]]
Sent: Tuesday, March 22, 2011 11:03 AM
To: Post all your questions about iText here
Subject: Re: [iText-questions] getDpiY returning 50% of Actual for TIFF (images
& pdfs attached)
The dpi is correct, there's nothing wrong with the image or iText. When showing
the image you must scale it differently for the width and the height.
Paulo
_____
From: Steve Roberts [mailto:[email protected]]
Sent: Tuesday, March 22, 2011 2:35 PM
To: [email protected]
Subject: [iText-questions] getDpiY returning 50% of Actual for TIFF (images &
pdfs attached)
Hi all,
When I send a fax from my fax machine -> fax server / tiff -> itext, getDpiY is
returning 50% of the actual Y value.
Sending the same page from my fax modem -> fax server / tiff -> itext, getDpiY
returns the correct 100% Y value.
Viewing both images in Irfanview shows correct X & Y values, both use Group 3
Fax Encoding, both are 1 page and the sizes are comparable, 3.78MPixels vs.
3.9MPixels.
Any ideas on why getDpiY is cut in half for the fax machine image? Have there
been updates to the image size determination in the last couple releases that
would address the issue?
Thanks,
Steve Roberts
_____
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