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Thread: Converting DPI (pixels per inch) to pixels per cm (PPCM)

  1. #1
    Senior Member somlemeg's Avatar
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    Converting DPI (pixels per inch) to pixels per cm (PPCM)

    Hi guys, in my project I need know how many pixels one cm is on the screen.

    I get the DPI (pixels per inch) in flash using flash.system.Capabilities.screenDPI, for my screen I get 72.
    I try converting to pixels per cm (PPCM) by dividing on 2,54.
    72/2,54=28,35 PPCM.

    However if I create a square that is 28 pixels on the screen and measure that with a real world ruler, it is approx. 0,7 cm.
    So something is wrong here, also if I create a box on the screen that is 72 pixels, is measures with a ruler about 1,8 cm, not 2,54 cm (1 inch).

    What am I doing wrong? Is the DPI resolution reported by flash false???

  2. #2
    Senior Member somlemeg's Avatar
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    Seems like the user needs to calibrate after a real world ruler to get it right.

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