[Image-SIG] .DCX files and dpi information

[Chris Barker]

Larry Bates wrote:

> i.info returns (1728, 2159) which is pixels of horizontal and vertical
> dots on the page.
> 
> Question: How can I obtain the resolution (e.g. dpi) of the pixels as
> they are encoded in the file?  The faxes can come in in either 100
> or 200 dpi vertical resolution (e.g. fine setting on fax machine) and

Well, it's a kludge, but if you can't get the info directly, it's pretty
obvious that the above example is 200 dpi (1728 / 200. = 8.64), unless
someone is sending a fax from a machine that can handle 17in wide paper.
If the options are really only 100 or 200 dpi, it shojuld be easy to
figure it out for any reasonable image.

-Chris




-- 
Christopher Barker, Ph.D.
Oceanographer
                                    		
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Chris.Barker at noaa.gov