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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Spanky Ham
Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central
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| Posted: Sun Jun 20, 2010 2:41 am Post subject: |
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Very good article. I haven't really looked into this much, but having worked with a Datacolor spectrophotometer and Datacolor themselves I always think in terms of delta error. I just assumed most thought along the same lines regarding these instruments. Glad you are giving the less expensive crowd an alternative with less variance.
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kal
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Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Sun Jun 27, 2010 1:39 pm Post subject: |
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Added the following:
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I now have enough data on the Chroma 5 colorimeter to provide a fairly clear picture of its level of accuracy relative to a known reference. The table below shows the errors of the Chroma 5 when reading white and then when reading an average of the primary and secondary colors for four different types of displays.
| Code: | White x White y Color x Color y
Plasma 0.003 0.005 0.005 0.005
Sony LCD 0.005 0.003 0.006 0.007
Samsung LCD 0.002 0.005 0.005 0.005
Front Projector 0.004 0.004 0.004 0.005 |
This shows that the Chroma 5 is an excellent device, at least when factory-fresh. These errors will increase over time as the filters are exposed to changes in heat and moisture, which is why annual recalibration is recommended.
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Kal
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SecondaryColorsSent
Joined: 13 Feb 2012
Posts: 7
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| Posted: Wed Feb 15, 2012 10:35 pm Post subject: Re: Colour Science: About Meter Accuracy |
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[quote="kal"][
Furthermore, the two biggest problems with colorimeters—inaccuracy and degradation over time as you expose the filters to variations in heat and humidity—can be remedied fairly simply. All that is required is that the colorimeter has been individually calibrated for a variety of different displays and that it is periodically recalibrated to maintain its initial accuracy.
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[u]How do you calibrate the colorimeters?[/u] I just ordered the i1 Display-2 But I might have to calibrate it, since it's been discontinued a long time ago.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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| Posted: Thu Feb 16, 2012 12:53 am Post subject: Re: Colour Science: About Meter Accuracy |
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[quote="SecondaryColorsSent"] | kal wrote: | [
Furthermore, the two biggest problems with colorimeters—inaccuracy and degradation over time as you expose the filters to variations in heat and humidity—can be remedied fairly simply. All that is required is that the colorimeter has been individually calibrated for a variety of different displays and that it is periodically recalibrated to maintain its initial accuracy.
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How do you calibrate the colorimeters? I just ordered the i1 Display-2 But I might have to calibrate it, since it's been discontinued a long time ago. |
It's a service that we offer. In the case of the i1 Display 2 see: http://www.curtpalme.com/ChromaPure_EyeOneDisplay2.shtm
Kal
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HogPilot
Joined: 21 Jan 2010
Posts: 2383
TV/Projector: Vizio P702ui-B3, Pioneer Elite Pro-151FD & 111FD
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| Posted: Thu Feb 16, 2012 2:59 pm Post subject: |
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Kal - excellent post, very informative! Do you think you could add a section about meter accuracy with respect to different display types that use different types of lighting (i.e. plasma vs LED vs UHP vs CRT, etc)? In other words, how the spectral output of various lighting sources affects how well different types of meters can read them.
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Sun Mar 02, 2014 12:36 am Post subject: |
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Just noticed this error. Surprised no one has pointed it out in 3+ years...
"Colorimeters use much larger photo sensitive diodes than spectroradiometers. This results in a considerably lower signal-to-noise ratio and much greater ability to accurately read under low light conditions."
That should say that the larger photo-sensitive diodes result in a considerably lower noise, and thus a higher S/N ratio.
High S/N = Good. Low S/N = Bad. 
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kal
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Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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