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[How to] Calculate Resolution Of An Image


In Physics AS, it is important to know how to work out the resolution of a given image. The resolution is...
The size, in real life, of one pixel or real life length / no. of pixels
For this reason, it is usually measured in metres per pixel.

Let's have an example and calculate the resolution of the following picture of the River Thames:


You will have to estimate the size of the image and therefore how many metres of 'real life' it is showing unless told. For the case of the River Thames, I have estimated the width of the given part of the river is 250 metres. On the picture, this is represented by 20 pixels (for that, I just added them up). Now, remembering the equation for working out the resolution of a image:


We have everything to work out the resolution of the above image of the Thames. 250 / 20 given us a resolution of 12.5 metres per pixel.

It is important to remeber that anything smaller than 12.5 metres you will not be able to see.

If you are revising Physics Topics, please have a look at other articles I have done on Physics you may be interested in.

About Will Green

A student in England studying Automotive Engineering with Motorsport, Will created Ask Will Online back in 2010 to help students revise and bloggers make money. You can follow AskWillOnline via @AskWillOnline.

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