Re: filmscanners: negative and skin tones

["Maris V. Lidaka, Sr." <mlidaka@ameritech.net>]

My understanding is that there is a degradation or change returning from
CMYK to RGB but this is from what I have read and I have not experimented
myself as you have.  I do have two questions, though:

1.    Visually did you see a difference between the original RGB and the new
RGB made from the duplicated CMYK?

2.    Were the numbers the same or different between these two RGBs?

Maris

----- Original Message -----
From: "Robert E. Wright" <rew@impulse.net>
To: <filmscanners@halftone.co.uk>
Sent: Sunday, April 01, 2001 7:12 PM
Subject: Re: filmscanners: negative and skin tones


|
| ----- 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
| >
|
|