Computer Display resolution vs movies resolution? - AVS Forum
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post #1 of 5 Old 01-11-2008, 11:02 AM - Thread Starter
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I assume most us use a computer to view movies using Xl. My question is, what is the relationship between the resolution I set my computer too and the resolution the movie plays at? AS an example, if my computer screen is set to 800 x 600, and then I play a movie on my hard drive, does it also play in 800 x 600? or does it switch to a higher resolution? And does this mean then that I would have to have my computer resolution to 1920 X 1080 for the movies to play in a high resolution?

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Ray
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post #2 of 5 Old 01-11-2008, 12:40 PM
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The computer will rescale the movies from whatever resolution they are recorded in to the resolution you are outputting to the screen. If up scaling is required then it invents the content of the additional pixels required which often cause bluriness or granulation or if downscaling is required then it will eliminate pixels to get to the lower resolution.
Unless your movies are actuall recorded at 1920x1080 you do not want to upscale them to that value unless you have a true 1080p display and even it that case upscaling standard DVD movies from 480i to 1080p may be much better done by the display if it is a recent model HDTV.
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post #3 of 5 Old 01-11-2008, 12:52 PM
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Quote:
Originally Posted by walford View Post

If up scaling is required then it invents the content of the additional pixels required ...

That isn't how scaling works, the whole image is resampled to the new resolution rather than 'inventing additional pixels'. And while poor upscaling can make an image blurier, good upscaling will provide additional sharpness.
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post #4 of 5 Old 01-11-2008, 01:33 PM
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Quote:
Originally Posted by kylebisme View Post

That isn't how scaling works, the whole image is resampled to the new resolution rather than 'inventing additional pixels'.

Resizing to a higher resolution by definition requires inventing additional pixels, as well as changing existing ones, so they can be averaged out over a larger area. Also, resizing to a higher resolution can never add detail that isn't there.

The ideal resolution for your display is one that matches the source resolution. If that's not possible, the next best thing is one that has a much higher resolution than the source. The worst resolution is one that is only slightly larger than the source.
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post #5 of 5 Old 01-11-2008, 03:47 PM
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Quote:
Originally Posted by nm88 View Post

Resizing to a higher resolution by definition requires inventing additional pixels, as well as changing existing ones, so they can be averaged out over a larger area.

Upscaling is done by extrapolating a higher resolution image frin the source as a whole. It is not done as your explanation suggests, two seprate functions of modifying some pixels and inventing others.
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Originally Posted by nm88 View Post

Also, resizing to a higher resolution can never add detail that isn't there.

Of course not, but higher resolutions can be used to add more sharpness than can be achieved at a lower resolution without resulting in ugly ringing artifacts.

And the ideal resolution of a display is one that meets or exceeds whatever resolution you can resolve from whatever distance you are viewing it from. Upscaling from a slightly lower resolution source can provide a little additional sharpness, and upscaling from considerably lower resolution can provide a notable improvement in sharpness. Many TVs even upscale their native resolution a little to overscan the signal a bit, as the junk found on the edges of poorly edit content is far more detrimental to image quality than all but the worst quality scaling.
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