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: Sunday, April 01, 2001 8:31 PM
Subject: Re: filmscanners: negative and skin tones


> 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?

Certainly. The new RGB looked just like the CMYK. The point is I did not see
nor could I demonstarate a differince between the CMYK and the new RGB.
>
> 2.    Were the numbers the same or different between these two RGBs?

Sinced the difference blend mode was completly black (x-x=00) I must assume
so.

Bob
>
> 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
> | >
> |
> |
>
>