Hi Ludovic,
You can use my lcResTool to explore the variety of screen densities 
available.... sometimes called dpi or lpi or other names.
http://buchwald.ca/developer-tools/
An "actual size" image or graphic is more complicated that you might think!
Cheers,
- Charles

On 23 Jul 2014, at 12:27 AM, Ludovic THEBAULT <[email protected]> 
wrote:

> Hello,
> 
> I want to display a graphic at this real size in cm. 
> So i need to get the real size of the screen,  or at least the screen 
> resolution in dpi.
> 
> Thanks for any clue !
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--
Charles E. Buchwald
CEO/Director General
Museografica Digital
http://digital.museografica.com

LC Developer Tools: http://buchwald.ca/developer-tools/

Email Notice: http://wp.me/P3aT4d-33


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