You have to have a scale in the image, don't you?! Find a known quantity and 
account for the projection. 
 Tom Hart 




________________________________
From: Norman Silverstone <nor...@littletank.org>
To: gimp-user@lists.XCF.Berkeley.EDU
Sent: Wednesday, August 26, 2009 12:29:40 PM
Subject: Re: [Gimp-user] Measure tool (feature proposition)

< snip >

>  Now i am doing it with calc. I am counting pixels at scale
>  and then if i know how many px is for 200m then i can count how
>  many meters i for 743px.
> 
>  If someone will have solution i am interested in!

Just a suggestion why not go to http://forum.meetthegimp.org/ where
there is a section for ideas for scripts and a programmer who can
advise.

Norman

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