CurtPalme.com Home Theater Forum

dumalkin · Joined: 28 May 2010 Posts: 11

Hi,
Just bought Eye-One Display 2. I saw warnings about its possible drift after some time (filters aging and degradation etc).
I am completely novice in color calibration world, but have some "unique" opportunity to periodically access professional grade equipment - ask my father to borrow it for a weekend from another laboratory at his workplace.

I even don't know the model/manufacturer, but it something looking like laser gun with LCD readout. It should be pointed at the illuminated surface (not incandescent light) and after pressing the trigger it gives measurement in about 1 sec - x/y/Y values - should be handheld, and no any computer interface.

Let's assume it is calibrated (I'll check it against new Display2 after I receive it).

So the question is - is it possible to recalibrate Display 2 using this device ?
For instance, if I display calibration image of white on my monitor (or it can be used only for projectors ?) in a year, measure it with "laser gun", then with Display One and write the difference (probably it can be put directly to ColorHCFR, if not - I'll just adjust all measurements manually) - will it do ? Is is important to measure difference at each IRE level for each color, or doing it for 100% IRE for R/G/B is enough ? Or for white only ?

Thanks

**kal** · Posted: Sat May 29, 2010 5:42 pm Post subject:

The EyeOne Display 2 cannot be recalibrated. People usually simply buy a new one. You can however profile it against another known good meter like you mentioned.

I'm not sure exactly what you should be measuring but I would imagine that all 3 colours across the spectrum from black to white should be measured. This would be a real pain and generally is not worth doing by hand. Very tedious.

ChromaPure software has built in tools to do exactly this and makes it easy. Then ChromaPure keeps these offset tables for you to use (with ChromaPure only of course).

For more info see: www.curtpalme.com/ChromaPure.shtm

Kal

Brian Hampton · Joined: 22 Apr 2006 Posts: 1174

Kal,

In your guides you mention the D2 probes are calibrated at the factory and I"m curious if you have any info about that. Do you think maybe they measure the probe and just dis-card out of spec units? I can't imagine how a device like this would be calibrated. I can imagine that if manufactured a certain way it's response can be predicted.

-Brian

**kal** · Posted: Fri Jun 11, 2010 1:20 pm Post subject:

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

The way they are calibrated from what i understand is they change the Eprom in the device to change the formula it uses to measure light waves. the ones sold from the factory have a specific formula i'd assume. I think spectral or any other company that might want to sell the Probe with a bundled software program are given the source code and change the formulas for each individual probe after they compare it to a reference probe.then they change the numbers in the formula so the measure the probe made work to the reference measures of the Reference probe. I am not 100% sure on this but this is How i thin spectracal does it possibly . They get in a bunch of D2 and test them, any that are too off they go in and alter them.

Now remember this is my own assumption and I could possibly be 100% wrong. But from building the HCFR probe and learning how it uses other profiles to work i see it as a viable conclusion. The difference is the Eprom in the HCFR probe relies on other profiles to work, its not a set standard like in other mass produced Tri Stimulus probes. I profile mine to an i1 pro that i know is reference. So basically any profile I create for the HCFR probe should read the same as my i1 Pro or at least very close.

Athanasios

**kal** · Posted: Fri Jun 11, 2010 2:53 pm Post subject:

Rolls-Royce · Joined: 30 Sep 2007 Posts: 288 Location: Victorville, CA

I can vouch for what Athanasios said. I own an OpticOne (rebadged Progressive Labs CA-6X) probe and software. The original probe was part of a batch that had problems with the gluing at its seams, and it popped open during shipment. Inside was a small circuit board with the detectors and a number of surface mount ICs and other components. No pots. The probe was quickly replaced by the OEM.

Now, OTOH, my old Minolta TV-2130 has a probe with pots inside. But it's older tech, with a large main unit for its readout and controls and a matched probe that's about the same size as my I1Pro.

**kal** · Posted: Mon Jun 21, 2010 7:39 pm Post subject:

Update! Introducing the Display 2 PRO!

Now with ChromaPure on board we have a way to recalibrate Display 2 / Display LT meters for 8 different display types in the same way they do it for the Chroma 5 PRO, DTP-94 PRO, and the Hubble.

This greatly benefits all all tristimulus colorimeters as they all have unit-to-unit variations. They all benefit from this calibration to different displays using a reference spectroradiometer. They all deteriorate over time and benefit from periodic recalibration. The corrections are built in to the ChromaPure license file, so there is no change to the meter itself.

For complete details see: http://www.curtpalme.com/ChromaPure_EyeOneDisplay2.shtm

You can either purchase a new Display 2 from us or you can send in your existing Display 2 to have it calibrated for use with ChromaPure. This works with the Display LT as well as they're the same meter. We even pay for return shipping!

Kal

v_erich · Joined: 12 Sep 2006 Posts: 76 Location: Austria/Europe

Hi,

I have an X-Rite EyeOne Display 2 which is far away form a good performance.
I use it with calman 3.7

Is this re-calibration also working with other software then ChromaPure?
I think not if I understand it right...

Thanks,
Erich

**kal** · Posted: Thu Jun 24, 2010 1:08 pm Post subject: