Re: Delta, L Value? What do these mean?
Re: Delta, L Value? What do these mean?
- Subject: Re: Delta, L Value? What do these mean?
- From: jim rich <email@hidden>
- Date: Fri, 29 Dec 2000 09:06:02 -0500
Lee,
Delta E is the difference between two colors that are measured by the
CIE system. The delta E value of 1.0 (which is the lowest value on
this counting scale) represents the smallest color difference a human
eye can perceive between two measured colors.
In practice, delta E values are a way to communicate the change or
difference between two colors. Color management systems use delta E
in various ways to determine variation between color prints, input
and output profiles, and devices, such as scanners, monitors, and
printers. For me delta E is one measure of quality and can be used to
determine how much variation is in your imaging system. For example,
some profiling programs use delta E to give feedback to the end-user
when creating profiles. This type of information is useful to
determine if your profile meets certain quality standards when
creating a profile. It can also be used to prequality devices to
deteremine is they are within a reasonable tolerance before you
create profiles.
The list below shows how delta E can be used as a guideline to
qualify color differences.
* 1 delta E means there is almost no perceptible differences or
variations between two colors.
* 2-5 delta E represents minute color differences or variations in
high-quality imaging systems.
* 6-10 delta E represents small color differences or variations in
reasonably good quality imaging systems.
* 11-15 delta E represents normal differences or variations in
average-quality imaging systems.
* 16 and above delta E represents too much variation so color matches
are not visually close.
Hope that helps.
--
Best Regards
Jim Rich
Rich & Associates, LLC
P.O. Box 70882
Chevy Chase MD 20813
301-652-7266
301-652-8665 fax
email:email@hidden