See a printing guideline for the resolution needed for several common purposes. It's generally about what our eye is capable of seeing, but varies with the media.
More than 300 dpi really can't help photo prints, but less than 200 dpi can suffer less image quality. But planning image size to have sufficient pixels to be somewhere around 240 to 300 pixels per inch is a very good thing for printing, called "photo quality". But this dpi number does NOT need to be exact, 10% or 15% variation won't have great effect.
Printing photos at 250 or 300 dpi is considered very desirable and optimum. Scanning Size is the same calculation, more detail at end below.įile size is shown at The Four Sizes of a Digital Image below * For file size over PHP_INT_MAX (2 147 483 647), PHP filesize function loops from -PHP_INT_MAX to PHP_INT_MAX.This will show the required image size (pixels) to print this paper size at the desired dpi resolution. This functions returns the exact file size for file larger than 2 GB on 32 bit OS:
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