I provided a comprehensive answer yesterday. Even though your size is 144x5 
that's the size of the whole
scalebar image of which the actual bar is only a portion of. The bar is only 
111 pixels wide so 6 is the correct
value. Using your numbers this works out:

  111/144 * 7.886242254 = 6.0789784

The scalebar is correct.

Steve


>>> On 12/18/2008 at 8:04 AM, in message
<[email protected]>, "Amiya Patra"
<[email protected]> wrote:
> Hi.....
> 
> Please anyone give answer of my question.............According to me  It
> should  be 7.886242254  as my scale bar size is (144X5).............plz
> response............

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