Apache-Talk @lexa.ru 

Inet-Admins @info.east.ru 

Filmscanners @halftone.co.uk 

Security-alerts @yandex-team.ru 

nginx-ru @sysoev.ru 




      :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

> 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.

Unsubscribe by mail to listserver@halftone.co.uk, with 'unsubscribe 
or 'unsubscribe filmscanners_digest' (as appropriate) in the message title or 


Copyright © Lexa Software, 1996-2009.