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How are things downscaled/upscaled on monitors?

post #1 of 2
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I can under stand how it would work if you had a 1280x720 image and showed it on a 2560x1440 monitor because the later has 4 times the pixels and each four pixels of the later would equal one pixel of the former, but if you have a 720p image on a 1080p screen, how does that work?
    
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post #2 of 2
Some of the pixels are shown as 2 pixels on the larger screen and some are shown as 1. It's really that simple, which is why LCDs don't scale anywhere near as good as CRTs.
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