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I would like to print a Polaroid like image that is 336x407 mm big. What size is that in pixel and what PPI should I use?

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the size in pixel depends on the resolution you want to print with, the higher the resolution, the more pixel you get. e.g. for 300 pixel per inch you get 3969x 4807px as a result. –  KMSTR Nov 28 '13 at 17:16
    
Pixels have no size so really... you can't directly translate a mm to a pixel. –  Scott Dec 16 '13 at 17:51
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You have to know the pixels in order to get the pixels-per-inch conversion. For example, if you have a 100x100px image that you wanted to print as 1x1in, you would print at 100ppi. You don't have enough information to translate from measurements to pixels.

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