new i1pro 2 spectrophotometer - Page 5

The i1 Display Pro has sealed optics so the aging should be significantly less than the previous meters with exposed filters. But they will age, with the retail meters not even being a year old yet, I don't think the amount has been quantified.

As to the differences between the i1 Pro and i1 Pro 2, for emmissive measurements they didn't do anything to significantly increase accuracy. It's still 128 sensors binned into 41 10nm increments. It does have a mechanical alignment feature that will make sure the 41 increments are accurately aligned with the 128 sensors, but that's not typically a problem. The sensor sensitivity was changed so it'll be a little bit better at low light, but not a lot. But it can also measure much brighter displays as well.

I have orded the i1PRO2, once i will receive it, i will do some comparison tests using both meters (i1PRO vs. i1PRO2) at contact mode to various displays like models of LG-LED, LG-LCD, Samsung LED, Samsung LCD, Plasmas etc. My i1PRO it's NIST re-certified at X-Rite Factory of Europe @ 15-Dec-2011 and i have used it only @ non-contact mode.

Edmund Ronald's Color News

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Thanks TEDDD,
Looking forward to the results!

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What excactly will you compare?

I have here a 7 week old i1 Pro and a 1 week old i1 Pro 2.

So I can also provide some comparison data.

Comparison of reading between 2 meters (similar to that test), i have access to over 80 different TV models anytime

OEM i1Pro 2 are not out until early July 2012. The retail i1Pro 2 is out and available from many sources including Amazon.

I have an i1pro and i1pro2 here. The i1pro is just over a year old. The resulting monitor calibrations are not the same. They are not drastically different, but both gamma and greyscale are slightly different...with the i1pro 2 looking more neutral on greyscale, and the gamma slightly improved in bringing out the lowest shade levels without crush.

The only thing I don't like in terms of build quality, is connecting the i1pro2 to the monitor holder device. The fit is so tight, that plastic is scraping off the holder (not the i1pro2 itself) just in the first few times of using it (others might want to look at the prongs on theirs). And it is difficult to disconnect the i1pro2 from its holder as it requires some force to pull it apart. The older twist/lock mechanism used on the i1pro was better in my opinion.

Jon, if your monitor is a CRT, you can use the older I1 Pro CRT screen holder with the Pro 2. The Pro 2's lugs are at different locations so it will hang at about 5'o'clock instead of straight down like the Pro, but it works. The fit of my Pro 2 to its holders is very tight just like yours. My CRT RPTV also has an overhang where the bezel sticks out past the screen, so the Pro 2 monitor holder doesn't work well. The beamer holder doesn't really provide for a contact fit to the screen, so I don't use it.

Thanks. It is an LCD, but I see what you mean about the lugs. Strange design change here I think. Certainly a chance for accidentally breaking things if you try and remove the Pro 2 from its holders in a hurry!

SpectraCAL has start taking orders for OEM Version of i1PRO2

Light Illusion has added the X-Rite i1PRO2 'Display Use Only' Version of the meter at their WebStore.

I think you would probably find that there would be similar differences if you were comparing two i1Pros or i1Pro 2s as well though.

I've been following this thread with interest. However, would someone want to reword (simpler but with detail) what the thing was with reprofiling a colorimeter to a spectrophotometer when there is a CMS change (which changes the gamut?).

Perhaps I'm the only one who did not quite understand how significant this is, or is not.

Thanks:)!


edit: Allow me to explain a bit more. If you profile a meter, you are essentially saying "my expensive spectro meter says 0,0035 and my colorimeter says 0,0055". So we are going to create a matrix/table with offsets. I don't see how these offsets are suddenly invalid after making a change with a CMS?

Also it doesn't make complete sense why there should exist a profile per display type. Perhaps I should try finding how profiling is actually performed:-)
Edited by Jeroen1000 - 11/12/12 at 10:51pm

What I have found with the i1 Pro 2 is that while it does not require frequent re-initialization, the low stimulus brightness is drifting quite a bit from the moment is it calibrated till after a couple of minutes.

For example, measuring the display of my HTC One,

• The 0% reading is 0.43cd/m² immediately after calibration but it increases up to 0.55cd/m2 after 3 min and 0.60cd/m² after 5 min and 0.63cd/m² after 10 min.
• White starts at 446.7cd/m², then moved up to 447.6 cd/m² after 5 minutes, when it suddenly drops down to 445.5cd/m2 and seems to stabilize at 445.8 cd/m² after 10 min
• White temperature starts at 7100K and end at 7,190K after 10 min.

If I calibrate the device when it is warmer (after 10 min), then the drift becomes negligible.

• The 0% reading is 0.43cd/m² reading still reads 0.43cd/m² after 10 min.
• White also remains constant
• White temperature drifts only marginally (+20K)

If I recalibrate further along the line (after 30 min of continuous use), temperature continues to drift by 10K within 10 min. Overall the min has been 7100K and max 7230K with 80% of this fluctuation already accounted for after 10 minutes of use.

At first I was alarmed by the significant brightness drift at 0% stimulus, but this was because the i1 Pro 2 had to get warmer, so the initial calibration looses its accuracy there pretty quickly. Once the warming up threshold has been reached, the meter initialization holds much better.

Usually only color temperature and brightness are affected by time in operation. Gamut for primaries is usually stable. Note that the temperature drift after re-initialization are probably overestimated in my analysis due to running continuous measures every couple of seconds. Assuming you have a less intensive use with regular inactive time, I expect this drift to be more moderate. Recognizing this is important before any colorimeter profiling is attempted because the white reference is affected.

Has anyone made similar experiences with the I1 Pro 2 or i1 Pro?

Overall it is slightly disappointing that you are not exactly sure where along the line the right color temperature is being measured. Because of the rash drifting in the first few minutes, I have to assume that the more settled readings are the correct ones, since they do not drift as much. But I can't be 100% sure.

50K color temperature is not that important but 130K is not negligible. I wish x-Rite would give recommendations as to which measurement is certified? After how many minutes of operation??

As a comparison, my I1 Display Pro only drifts by 30K.
Edited by puremind - 4/17/13 at 12:11pm

As the temperature increases the noise to signal ratio also increases.
This is normal for all spectro devices.

Dark readings more or less compensate for the raised noise floor, jeti's 1201/1211 perform a dark reading prior to every reading. The super high level spectros have sensor cooling to stabilise the noise and keep it low as possible.
For the i1pro1/2 the fact that it drifts until warmed is not really a large issue, once the temps have settled the readings stay fairly consistant. Calibration is never done in 10 minutes.
Even $50,000 spectros need to be warmed up, I have a bench top spectro like this sitting behind me and you can't rely on measurements for atleast half an hour.

The other problem you have is expecting to read anything at 0 stimulas, do you know how hard it is to read nothing!

0% stimulus is still 0.43cd/m² on my extremely bright HTC One smartphone.

You have reassured me that my unit's behaviour is normal. But this shows another advantage of using a Colorimeter. Once profiled, it can be used immediately starting from its cold state.

Not true at all.

The sensors on a colorimeter are just as sensitive to heat.

But since you don't have to initialize them, it is less of an inconvenience...You profile them once and then the drift is minimum (in my testing within 30K). With the i1 Pro2 you first need to reach the temperature threshold before initializing or the drift is bigger.