Lighting question -follow the standards and measure
Lighting question -follow the standards and measure
- Subject: Lighting question -follow the standards and measure
- From: Per Savander <email@hidden>
- Date: Tue, 23 Nov 2004 10:29:15 +0200
Regarding the light quality discussion I would
like to give a handful of additional comments.
Considering the amount of parameters fluctuating
in a graphic workflow, we would be dumbos not to
eliminate the easiest one by having correct
lighting in the production environments.
ISO3664/12646 specifies parameters for the light
and environment, and they are not hard to acheive.
These are the main-part of the specs:
Critical comparison of prints: 5000K, Ra>90,
2000lx +/- 250lx, no reflections&neutral
environment
Ambient light: Ambient light: 5000K, Ra>90,
64-32lx, no reflections&neutral environment
Finally the hardest part for most of us in any
environment: "Regularly test all devices for
adhearance to specifications". The verification
of correct adhearing to specifications can easily
be done with the excellent light-measuring option
in the GMB iOne/Match software.
A fluorescent tube is not very stable and the
lightbooth-manufacturers request to replace them
once a year is in our (measured)experience not
just a salesmans statement.
The coding of fluorescent tubes is not very hard
to interprate, for example a L36W/950 code
printed on the tube states that it is 36 watts,
9=CIE 1A CRI index 90-100, and finally 50 that is
5000-5400K. So this does not state that the tube
necessarily is perfect vis-a-vis the ISOstandard.
You can always be on the safe side and get Just
Normlicht Color Control 5000 tubes that are 5000K
+/- 200K and have a CRI of 96.
The implementing of correct lighting is vital for a color managed workflow.
It is cheap. It is not difficult to achieve. Just do it!
p e r
--
Per Savander, PrePress Center Oy, Turunlinnantie 8, 00930 Helsinki FINLAND
http://www.prepress-center.fi/icc -Solutions for icc color-management
and workflow color control
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden