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Below are a series of diagrams indicating the size of images in relation to the width and height in pixels.
These charts demonstrate the sizes of typical images on a website and what size they correspond to if printed.
Normal Screen Resolution
This diagram 10 boxes from 60x60pixels to 600x600pixels
Minimum Possible Print Resolution – 150dpi
This diagram shows the approximate size of the top diagram if printed at 150dpi
Normal Print Resolution – 300dpi
This diagram shows the approximate size of the top diagram if printed at 300dpi
As you can see, the sizes when printed are a lot smaller than the size they appear on the screen.