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I assume we are talking here about JPEG images. The reason is very simple, the final size of the JPEG depends on the compression ratio, other JPEG parameters and the image content itself.

Therefore in digital cameras for example they trade image size for speed using a weaker compression scheme, while personal computer programs use more complex algorithms obtaining better image sizes.

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Q: Why images same resolution different size?
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Increasing the resolution of a monitor will?

decrease the size of the images!


If I have more than one computer monitor must they be the same resolution and size?

You need to get a Graphic card with dual l graphics ports if you want to run different resolutions , this is for different images on each monitor.


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