[filmscanners] RE: 8bits vs. 16bits/channel: can theeyeseethedifference

["Frank Paris" <frankparis@comcast.net>]

> The concept is always called DITHERING in the imaging world.
> You can quote DSP definitions, but unless you apply them as
> is standard in the imaging industry you are not going to
> understand and be understood. Your DSP definitions can apply
> quite easily -- the dithering is simply adding that 1/2 LSB
> noise to the data and then truncate to 8bit.  So: 127 goes to
> 127 +/- .5 goes to 127 127.5 goes to 127.5 +/- .5 goes to
> half 127, half 128 128 goes to 128 +/- .5 goes to 128

This sounds like in going from 48 bit color to 24 bit color, you're
losing spatial resolution. I never realized that before. That's what PS
actually does? Of course that IS dithering, not aliasing. Dithering is
something engineering deliberately does. Aliasing is something
engineering tries to deliberately avoid.

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