CurtPalme.com Home Theater Forum

island323 · Joined: 09 Jan 2012 Posts: 4 Location: British Columbia

I have installed my new optoma HD8600. Out of the box was nice but skin tone was off and most color were too deep. So I decided to follow the "dummy guide" and perform some calibration. I was using the i1 meter.

I have done quite well as far as setting the grey scale and gamma until I started the color adjustments. I couldn't get any of the y values of any of the 3 primary colors up to the proper percentage of the white. For example, y for 100% white is around 37 and 21% of that for red should be around 7.5 but the measured Y value for 100%red was 5.1 and no matter what I do I could not move red up much (not even 5.5). Same thing happened to green when I use the CMS adjustment to try to achieve 71% of y of white.

The Optoma HD8600 has the built-in CMS adjustments for each of the 6 colors (brightness, y-offset and x-offset). Not sure if the something wrong with the signals or the meter or my procedures. I used the AVS HD 709 test disc and was not sure if I was using the right test pattern.

Can someone shed some lights?

Cheers,

Frank

Nashou66 · Posted: Mon Jan 09, 2012 5:16 pm Post subject:

Which i1 meter? And what Program?

Nashou

**kal** · Posted: Mon Jan 09, 2012 5:36 pm Post subject:

I’ve never used the Optoma HD8600 I’m afraid so I don’t know how the CMS works. They may provide the controls but it doesn't necessarily mean it works correctly. There are quite a few projectors/displays out there with a "broken" CMS.

You mentioned that you don't know if the problem was with your signals or the meter or your procedures and that didn't know if you were using the right AVS HD 709 test pattern.

You may want to post what your setup is in terms of signals, what procedure you were using (if different from the documented one in the guide), and what test pattern you were using. That will give others the information they need to assist.

Posting your values/graphs/charts will also help.

Kal

island323 · Joined: 09 Jan 2012 Posts: 4 Location: British Columbia

Hi thanks for getting back.

I am using a Eye-one i1 display LT bought new before Xmas and used it twice. Porgram is HFCR.

I have been following the Kal's dummies guide like a bible and done very well with first part for the grey scale and gamma using the DVE HD Basic BD. Then I also downloaded the AVS HD709 DVD and I was using the pattern under "HFCR" section. For color I was using the 100% fields. I found two sets of pattern which "Satuated" and "100 Color" but did not find the one labelled as "Primary 100%" etc. I also used the older Avia DVD and found that the reading on the three primary patterns are different from that of AVD HD 709.

But even before I started adjusting using the CMS and HD 709 patterns, I followed a section in the dummy guide (STEP 8.2) where I would adjust the "Color" settting using 100 IRE white and Red so the y value of Red is approximately equal to 21% that of white. My Y reading for red in this step was so low that I would not get anything near the 21% value even to move the "Color control" from 0 to Max=+50.

I am not sure if that was a proble of my i1 or the pattern I was using. Is there any way to verify? Could someone point to me the exact label of the 100% color pattern I should be using within the AVD HD 709 disc. When I playe that disc in my Oppo I was not able to get all the chaper listing and it tend to jump from one to another. However the patterns I used, say red, does has the wording 100% red within the color window.

I also want to add that the "color control", the color gain/bias settings, and the CMS all seem to work as I can see the colors changed on the screen when I adjust them. Also, the projector out of the box produced a picture with colors of too much saturation in my opinion so I don't think it is a broken CMS or that the PJ is incapable of producing the color intensity. The meter reading was quite sensitive when I adjust the gain/bias of red or blue during the grey scale calibration.

Many thanks in advance!

Frank

**kal** · Posted: Tue Jan 10, 2012 2:02 pm Post subject:

[quote="island323"]Hi thanks for getting back.

I am using a Eye-one i1 display LT bought new before Xmas and used it twice. Porgram is HFCR.[/qiuote]
Colorimeters don't wear out the more they used. They have filters that age over time when exposed to heat/humidity. Kept in a cool/dark place like in a plastic bag with a desiccant and they'll stay accurate longer.

Just because it's new to you doesn't mean it's new.

island323 · Joined: 09 Jan 2012 Posts: 4 Location: British Columbia

Thanks again Kal.

I used the same meter to check my computer monitor and the red was 21%. I think it might be the way the i1 takes reading bounced off the projector screen, paired with the way HFCR interprets it. I have read from other forums that ppl seemed to report having the same inaccurate red reading from the i1. I also run the meter thru the diagnostic program came with the i1 and it passed all the tests. I am still mystified.

As to the possibility of ineffective CMS adjustments, I got the same problem using the simple "color adjustment" and it did not change much of the red readings even if I moved "color" from zero to max (+50) though in all cases - "color" or "red brightness in CMS" adjustments, I could see the red changing on the screen while the readings for red shown on the spreadsheet only increased very slightly in decimal pioints.

Nashou66 · Posted: Tue Jan 10, 2012 5:35 pm Post subject:

When was the probe manufactured and certified? If its older than say 9 months I would not trust it.

Find someone who has a i1 Pro for you to borrow and profile the D2 to the i1 pro. then you'll have an accurate matrix file for your D2 to use in HCFR.

Tri stimulus probes absorb moisture and cause the red filter especially to drift.

Trusting your meter is the most important part of calibration. If you plan on doing this frequently id look for a spectroradiometer like the i1 pro or the Colormunki Spectro ( not the tri stimus colorMunki). If you plan on only using HCFR then your stuck with the i1 Pro as they do not support the ColorMunki Spectro.

it is always best to have both types in your possession, the accuracy of the spectro and speed of a tri.

Athanasios

**kal** · Posted: Tue Jan 10, 2012 5:55 pm Post subject:

The other option is to send in the Display LT to have it calibrated against a reference spectro (worth $10K). We offer the service here:

http://www.curtpalme.com/ChromaPure_EyeOneDisplay2.shtm

Only works if you use ChromaPure however. One of the benefits is increased accuracy for these display types too:

Generic LCD
Samsung Standard backlit LCD
Samsung LED backlit LCD
Sony Standard backlit LCD
Sony LED backlit LCD
LG Standard backlit LCD
LG LED backlit LCD
CRT
Plasma
Front Projection-Screen
Front Projection-Lens

Kal

island323 · Joined: 09 Jan 2012 Posts: 4 Location: British Columbia

Again thanks for the input. I will look into all the options suggested. Cheers, Frank