Re: [iText-questions] getDpiY returning 50% of Actual for TIFF (images & pdfs attached)

[jmueto]

The most frequetly used fax resolutions are 204dpi*196dpi and 204dpi*98dpi. Transmitting every second line is an effective approach to cut the duration of the telephone call with little impact on the readability of text characters. You will also frequently see 200dpi*200dpi and 200dpi*100dpi. This might be due Windows GDI which used to have problems with resultions which are not a multiple of 100. I can not tell if theses problems are solved since Windows Vista. JoergMT Am 22.03.2011 20:44, schrieb Steve Roberts: I found a writeup of the 50% Y dimension problem at http://forums.oracle.com/forums/thread.jspa?threadID=1269908&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

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