[filmscanners] RE: 8bitsvs.16bits/channel:cantheeyeseethedifference

["Paul D. DeRocco" <pderocco@ix.netcom.com>]

> From: Roy Harrington
>
> Interesting.  Maybe they figured there was a possibility of color
> artifacts showing up.  I assume you mean an RGB where R=G=B ?  If they
> were different the dithering would have to be different, too, wouldn't
> it?

I think the noise added to the three values is the same. If the fractional
bits of the three colors are different, then how the three values round off
to eight bits would vary among the colors.

If the difference were at all visible, which I doubt, I think having the
colors separately dithered would be a slight improvement, for the same
reason that an B&W image printed on an inkjet appears less grainy when
printed with CMY dots rather than just black dots.

> That's strange.  I've always been able to change the mode to 16bit.  You
> can't have any layers of course.  I'm using PS 6 and 7 on both
> Mac OS 9 and OS X.

Ahah! The key is layers. When I create a new blank image, it comes out as
having one layer and no background. If I flatten it, then I can convert to
16bpc. You learn something every day...

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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