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Very basic screen resolution calculations
Pixels and inches


To approximate a screen resolution setting, measure the
width of the following screen image with your ruler:

1 inch x 1 inch
The image was programmed to a size of 72 x 72 pixels, a calculated size of 1" x 1", based on 72 pixels per inch. So, the beginning calculation is: Multiplier = ( 1 / Measured width) Given your screen image measures: a. less than 1", see reference Example #1 below; b. more than 1", see reference Example #2 below. Example #1: a. Assume that your image actually measures .75". Then: Multiplier = ( 1 / Measured width) = ( 1 / .75 ) = 1.3333 b. Checking = (Measured width x Multiplier) = ( .75 x 1.3333) = 1" Programmed width Example #2: a. Assume that your image actually measures 1.25". Then: Multiplier = ( 1 / Measured width) = ( 1 / 1.25 ) = .8 b. Checking = (Measured width x Multiplier) = ( 1.25 x .8 ) = 1" Programmed width For either example: In order for a viewer of this same screen resolution to learn the approximate programmed width of another image: Programmed width = (Measured width x Multiplier)
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