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I am trying to create a screenshoot of a zone of my screen I did some test and for JPG file it always create a 96 dpi resolution image.

I tried using the technique described in How to set DPI information in an image? but it seems to only change the metadata of the image.

Thanks for help

edit 1 : so I want to create a screenshot at a resolution higher than what my display is using. As @Toam said, the display is actually 96 DPI

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curvenut
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  • If you are trying to take a screen shot you will be theoretically limited to the screen resolution, since that is how the image is being rendered. 96 DPI seems to be the standard (at least in Windows) for the display (See: http://en.wikipedia.org/wiki/Dots_per_inch#Computer_monitor_DPI_standards) and that is what you are sampling when you take a screen shot. – Toam Jan 26 '15 at 00:10
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    Why would you want a 150,300,600 DPI image? All things are rendered in pixels – EDToaster Jan 26 '15 at 00:11
  • @JClassic , I mean 150 or 300 or 600 dpi – curvenut Jan 26 '15 at 03:41
  • Oh XD ok. I though you mean 150 million – EDToaster Jan 26 '15 at 03:44
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    DPI *is* just metadata... Setting the DPI higher will not give you more detail or more pixels. Do you mean you want to create a screenshot with a higher resolution than what your display uses? – Harald K Jan 26 '15 at 08:56
  • @haraldK Thats what I realize the DPI information is just metadata used to print the image to the printer.. And you are right , I want to create a screen resolution higher than my display is using ... So far it alays create at 96 dpi – curvenut Jan 26 '15 at 14:38
  • @Toam Thats exact the screen shot I create are always at 96 dpi. But I want higher DPI, do you known a way to achive this ?? – curvenut Jan 26 '15 at 14:40
  • The dpi of the image is purely dependent on its display size. It's not a property of the image. If you zoom in you decrease the dpi. Your screen probably can't physically display better than 96dpi (there aren't enough pixels). – Holloway Jan 26 '15 at 14:46
  • "I tried using the technique described in How to set DPI information in an image? but it seems to only change the metadata of the image." Well, yes. You can print a 96 dpi screen image on a 600 dpi printer, and roughly 6 inches of screen image will print in one inch of paper. You don't gain any pixels, unless you use a program to interpolate pixels. – Gilbert Le Blanc Jan 26 '15 at 17:15

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