Le 28/08/2014 17:53, clipka a écrit :
> the aspect ratio (relative length of the right and up vectors, which
> should ideally fit the image aspect ratio) determines the vertical field
> of view.

pinpointing: as long as the expected final pixels are square.

From memory, when doing DVD image (720x576 for Pal, IIRC), the
pictures/movie could be displayed as 16:9 or 4:3 according to the right
bit at the right place. yet, 720x576 is neither 4:3 or 16:9, as it is 5:4.

(for NTSC, the resolution is 720x480, a 3:2 ratio, not a square pixel
either)

So, to avoid distortion, the up & right ratio should be the same as the
viewed picture, and the height & width might be whatever is needed for
the storing media.

-- 
Just because nobody complains does not mean all parachutes are perfect.

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