Re: filmscanners: negative and skin tones

["Robert E. Wright" <rew@impulse.net>]

----- Original Message -----
From: Maris V. Lidaka, Sr. <mlidaka@ameritech.net>
To: <filmscanners@halftone.co.uk>
Sent: Saturday, March 31, 2001 7:47 AM
Subject: Re: filmscanners: negative and skin tones


>
> Another problem that comes to mind is that scanners export the image in
RGB
> and desktop printers (without exceptions that I am aware of) require RGB
> input, performing the RGB-CMYK conversion internally.  As there is loss in
> color in the RGB-CMYK conversion and the subsequent CMYK-RGB re-conversion
> many try to avoid having to color-correct in CMYK despite the benefits of
> the black channel.
>
> Maris

The change in going from RGB to CMYK is quite observable, and expected due
to the implied change in out put media (to print), but is a further loss in
going from CMYK back to RGB demonstratable?

I just tried an experiement on one image. I first converted from RGB to CMYK
(difference observable). I then duplicated the CMYK image and converted it
to RGB. Finally I copied the RGB into the CMYK image and used difference
blend mode, result complely black. I also copied the CMYK image into the RGB
file. Same result.

Bob Wright
>