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Repeated measurements the same patch

Repeated measurements the same patch

2009-01-20 by shse100

Hello !
Coud your explain me - what maximum difference for the one patch 
measurement can be (or can be allowed)?
For example, if i see table of measured values on monitor, i can see, 
that some measured patces "try" to "out" from column gradient of 
ligth (some of measured patch has some L value, next patch in column 
has lower L, then previous, the third patch has L value high than 
previous). Repeated continued measurements of tis "bad" patch can 
change L value from 2 to 4 up and down, before i can "put" this patch 
between "neighbours". More "stable" repeated measurements can be 
achived by klicking to white area of paper before.
Does Spectrocolorimeter Model #1005 hase some "memory" or some 
saturation?

Re: [colorvision_group] Repeated measurements the same patch

2009-01-20 by cdtobie


On Jan 20, 2009, at 5:12:37 AM, shse100 wrote:
Show quoted textHide quoted text
Repeated continued measurements of tis "bad" patch can 
change L value from 2 to 4 up and down, before i can "put" this patch 
between "neighbours". More "stable" repeated measurements can be 
achived by klicking to white area of paper before.
Does Spectrocolorimeter Model #1005 hase some "memory" or some 
saturation?
---
There is an inevitable "warmup" effect, which means any measurement should ideally be preceeded by at least one "test" measurement. When I am to lazy to do this any other way, I simply measure the patch I want to redo, back up with the left arrow key, and measure it again. Then I measure any other patches I wish to redo with a single measurement, as the device is now warmed up. I would not expect, after that first reading, to find futher readings varying as much as 2 L* unless it is a difficult media, and a very dark color.
--
C. David Tobie
WW Product Technology Manager
Digital Imaging & Home Theater
Datacolor
CDTobie@...
www.datacolor.com/spyder3

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