Quote:
Originally Posted by Shiandow
To 'properly' double an image in that sense is impossible since √2 is irrational. Anyway, in almost all cases it is easier to talk about the scaling factor instead of the ratio of pixels. This also corresponds more closely to the technical meaning of resolution which is measured in pixels per inch.
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Ppi is pixel density. The definition of resolution is the amount of information/detail in an image. If one image has 4x the information as another, it is 4x the resolution. Why break up the relation between the horizontal and vertical and call it 2x the resolution, when doubling in both directions implies you get 4x the original. Makes no sense.
Also in games for example, 4xSSAA is 2x in the horizontal and 2x in the vertical. But it is still called 4x, because the result is 4x greater.
Quote:
Originally Posted by sheppaul
It's from intrinsic properties of Nnedi3 filter. The filter is designed for that purpose.
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Well power of 2 can mean anything. Maybe 2^2 (4x) is reffered to as doubling and 2^4 (16x) is quadrupling, based on the amount of pixels they give.