From: Alan Bucknam (alan@notchcode.com)
Date: 02/09/03-08:35:31 PM Z
I have heard from a few sources that using the green channel in an RGB
scan will result in the most accurate conversion of tonal values.
any other thoughts?
-Alan Bucknam
On Sunday, February 9, 2003, at 12:03 PM, jacques verschuren wrote:
>
> I converted a grayscale stepwedge to RGB and noticed that a change in
> density occurred:
> Grayscale 0% changed to 0% RGB, 5% to 4%, 10% to 8%, 20% to 16%, 30%
> to 24%, 40% to 33%, 50 - 42, 60 - 52, 70-62, 80-72, 90-84, 95-90,
> 100-100. Converting back to grayscale resulted in the changed values
> in grayscale. In order to calibrate and apply curves to images is it
> advisable to print the grayscale image as an RGB file on a desktop
> printer? Or convert grayscale to RGB and than re adjust the changed
> values to the original?
>
> Jacques Verschuren
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