Re: Hutch Targets
Re: Hutch Targets
- Subject: Re: Hutch Targets
- From: Marco Ugolini <email@hidden>
- Date: Fri, 10 Mar 2006 22:34:12 -0800
In a message dated 3/10/06 10:20 AM, bruce fraser wrote:
> Here's a simple objective test for evaluating scanner profiles AND
> for determining the ideal scanner tone curve. (Andrew alluded in an
> earlier message to the fact that I use the Imaco 848 at gamma
> =3.0-this is how I found the gamma value.)
>
> Scan the target.
>
> Build a profile.
>
> Assign the profile to the target.
>
> Convert to Lab
>
> Compare the difference between the Lab values in the scan and those
> in the target reference file.
>
> Repeat with different tone curves until the minimum delta-e is achieved.
Hi Bruce.
You mean to say that one ought to keep setting different gamma values in the
scanner software when scanning the target, then create a profile for each of
those gamma values and assign it to the raw scan of the target, until one
achieves the lowest Delta E values compared to the reference file: is that
correct?
It's been a while since I last used an Imacon, and I forget whether it
allows the user to specify precise increments in gamma values (e.g., 2.1,
2.2, 2.3, etc.): I seem to remember that it does, or am I mistaken?
Thank you, and best regards.
--------------
Marco Ugolini
Mill Valley, CA
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