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Your phone will not generate images with a pixel density of 72ppi... it will generate images with x/y pixel dimensions. What that means in terms of pixels per inch depends on how large it is printed/displayed. E.g. if you use a phone with a 12MP sensor that generates an image of 4000 pixels wide, and you printed that image at 4" wide, it would have a pixel ...


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Usually, it is recommended to print photos at 300dpi (= dots per inch, which is the print equivalent to ppi, as printer cannot print pixels but dots). However, if you simply set the pixel density to 300dpi, it might not change anything if the original photo isn't large enough. You can determine the maximum print size at 300dpi from the photo's dimensions. ...


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The magnification of an imaging system is the ratio of the size of an object on the sensor to the real-world size of the subject. This relation, when combined with the thin lens formula, and solving for subject size yields: The smallest detail you can resolve corresponds to a single pixel in your resultant image, so the "image size" should just be your ...


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