Re:CSS px is an Angular Measurement
by kijin on Tuesday March 13, 2012 @01:31AM
(#3697162)
OK, so based on the following spec:
> It is recommended that the reference pixel be the visual angle of one pixel on a device with a pixel density of 96dpi and a distance from the reader of an arm's length. For a nominal arm's length of 28 inches...
It would seem that the reference pixel is simply 1/2688 of the typical distance between your eyes and the device. If a device is meant to be used at half the "arm's length" distance (14 in), the reference pixel on that device would be only half as large. If a device is meant to be used at 3x times the distance (84 in), the reference pixel would be 3x larger. Much easier than angular diameters.
> It is recommended that the reference pixel be the visual angle of one pixel on a device with a pixel density of 96dpi and a distance from the reader of an arm's length. For a nominal arm's length of 28 inches...
It would seem that the reference pixel is simply 1/2688 of the typical distance between your eyes and the device. If a device is meant to be used at half the "arm's length" distance (14 in), the reference pixel on that device would be only half as large. If a device is meant to be used at 3x times the distance (84 in), the reference pixel would be 3x larger. Much easier than angular diameters.