Re: Averaging profiles?
Re: Averaging profiles?
- Subject: Re: Averaging profiles?
- From: John MacDonald <email@hidden>
- Date: Wed, 26 Jan 2005 12:57:25 -0500
- Organization: Dodge Color, Inc.
Hi Andrew,
I think I misread Douglas' e-mail. I thought he said there was a
difference between each roll; that is, each roll had its own discrete
characteristics. Now that I've reread it, it looks like he might be
talking about what you describe: differences within each roll. This
would be much more similar to the printing press example you gave, and I
could see how it would be practical to average data.
I just didn't see the sense in going to the trouble of getting a good
profile for each roll, when each roll itself was stable, and then
creating an average profile, unless it's to eliminate the need for
profiling every roll you get.
Thanks,
John MacDonald
Andrew Rodney wrote:
On 1/26/05 8:51 AM, "John MacDonald" wrote:
If you've taken the effort to get good profiles for, say, three rolls of
media, you have a good profile for each one of the rolls. Averaging them
would create one mediocre profile for all three, and would require an
additional step. So it wouldn't improve your quality, and it wouldn't
save time.
Depends on how far each data set is from each other. For example, on my Fuji
PG4500, the differences in Matt versus Glossy paper are quite small (an
average deltaE of well under 3). Using one profile from each averaged data
set allows me to use one profile for either or both. In *some* production
environments, that's useful.
The beauty of MeasureTool is it shows you in various deltaE scales how far
two devices are and you can decide if it's useful to average them into one
profile. Another example is where you have a device (like some presses)
where there is some deviation over the press or run. Again, if it's not far
off, averaging multiple data sets into one profile can be useful.
Andrew Rodney
http://digitaldog.net/
--
John MacDonald
Dodge Color, Inc.
4827 Rugby Ave.
Bethesda, MD 20814
(301)656-0025 ext. 223
www.dodgecolor.com
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