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 Display Calibration Fundamentals : My Take, Display Calibration

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TSanfieldude
post Aug 20 2011, 01:19 PM

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U shd be able to. Select true cinema and calibrate cinema in service menu. They r the same template.
TSanfieldude
post Aug 25 2011, 02:25 PM

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QUOTE(klimal @ Aug 25 2011, 11:26 AM)
Is this any good?Greyscale and Color Calibration for Dummies http://www.curtpalme.com/forum/viewtopic.php?t=10457
Can I use the recommended software and hardware to get useful results?
Is it hard to use? sweat.gif
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Doc, if ur willing spend the time and money u can do a good job calibrating displays. I would get a proper spectro and a good colorimeter if u r planning to calibrate projectors. Let me know if u need help with software/hardware options and any other advice regarding calibrations.
TSanfieldude
post Aug 25 2011, 06:37 PM

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QUOTE(klimal @ Aug 25 2011, 04:14 PM)
I am only thinking of calibrating my own projector.

Just like when I started with  REW, it looks formidable now.

How about the Eye One meter? Is it ok to start with this?

Is rather affordable, and will help me to get to grips with the software and set-up.
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The i1 Display2 /LT is a entry colorimeter and will work for a start. U can use it with the freeware HCFR.

I would ask that you also check out X-Rite's new i1 Display 3 that is much better but not supported by HCFR. Still, they are both colorimeters and will degrade with time and since they use filters to work, might not be accurate for Colour Management Work.

If u go with Chromapure/Calman, they support more meters and u can profile the colorimeter with a spectro (since u only use it for ur projector, it will work for longer time). I can setup the profile with my spectro, but would need to get temp licenses from Calman to support that. But they meters cost more and the software is not free.
TSanfieldude
post Aug 26 2011, 02:41 PM

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QUOTE(pierreye @ Aug 26 2011, 11:15 AM)
Can I profile my i1 Pro with your calibrated i1 Pro with Calman 4.0 spectrometer license? I see during the initial measurement, the software had an option to profile against another meter.

Also, how much for hardware calibration? My i1 Pro already 3 years and I think it's time for recalibration. Will download i1diagnostics to check first.
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It might not work due to similar driver used for both devices. We can try though. The easier way would be to take a read with my i1 pro then urs and note the differences. Mine was recertified but it did not need recalibration. We can plan on something next week if ur around. Recertification is usd175.

This post has been edited by anfieldude: Aug 26 2011, 11:08 PM
TSanfieldude
post Oct 4 2011, 07:16 PM

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QUOTE(yonggoh @ Oct 4 2011, 02:27 PM)
my display results after the magic wand of anfieldude! smile.gif
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Hope u r enjoying ur THX calibrated display!
TSanfieldude
post Oct 5 2011, 01:14 PM

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QUOTE(Docan @ Oct 5 2011, 12:34 PM)
Fren, you said its ISF not THX yes?
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Docan,
ISF and THX standards are the same as they all meet the relevant specs. In the case of yonggoh, there is a request to submit calibration to thx for the plaque and letter. THX and ISF are the 2 official bodies that are kinda of the bodies that are championing the cause to educate the mass market in the necessities and benefits of calibration. In my case I am certified by both bodies, so rest assured it meets both the bodies requirements.
TSanfieldude
post Oct 5 2011, 03:04 PM

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QUOTE(klimal @ Oct 5 2011, 02:37 PM)
anfieldude,
when will you be doing mine?
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Will be in town this week. We'll discuss on pm.

This post has been edited by anfieldude: Oct 5 2011, 03:04 PM
TSanfieldude
post Oct 7 2011, 07:39 PM

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QUOTE(klimal @ Oct 7 2011, 05:41 PM)
Please elaborate  rclxub.gif
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I normally use casino royale to test the accuracy of the calibration. In this case as it was a dune with no bd drive. We tested using other scenes.
TSanfieldude
post Oct 10 2011, 02:36 PM

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QUOTE(pierreye @ Oct 10 2011, 01:09 PM)
I just got the Lumagen Radiance Mini from Anfieldude. I haven't calibrate my Panny Plasma yet but a quick try on few of the functions that I'm looking for does fulfill my requirement.

1. As I'm using HTPC for my plasma, Panny TV had a problem with Full RGB where it can't output BTB. Anything below 16 is crush. Also setting the HTPC output to YCbCr do solved the BTB problem but due to double conversion (due to all video card need to process in RGB), there are some minor banding in smooth gradient. I try out RGB Full from PC and use Lumagen to force YCbCr 4:2:2 10bit output to Panny TV. Looks like this solve the crushing issue plus smoother gradient.

2. 21 point gamma correction solved the ATI and Panny combo where the gamma average around 1.9 - 2.1. No longer need settings in ATI control panel and set the gamma at 0.9 to pull the average closer to 2.2.

3. CMS to solve the oversaturated green in Panny TV.

4. Vertical Shift for 2D and 3D format. Good for my projector where I need to shift widescreen to the bottom and use top masking only.

Question: Is the build in test pattern for Lumagen as good as AV Foundry VideoForge pattern generator?

Still waiting for OEM i1Display Pro from Spectracal for 3D projector tuning due to better low light measurement. Going to profile against the i1Pro. The dark reading in i1Pro every few minutes is a pain in the ass for 3D calibration. I need to take the glasses off, put on the cap and redo the dark reading then put back the glasses again.
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pierreye,

Will test the internal patterns vs my VideoForge, but I recall someone else doing it and confirming that they match.

Also the good thing is that the Lumagen has the necessary saturation patterns and if u r using it with Chromapure then u call do the saturation stability charts as well.

Its a very powerful VideoProcessor and the scaling/deinterlacing is really second to none. I will review it in detail when I hv the time.

Blastomuss/ape, both ur pjs were about the same....Grey screen and in the case of blastomuss the size caused it as well.
TSanfieldude
post Oct 10 2011, 08:56 PM

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Doc,

Post calibrated pjs rarely give high brightness. Some DLPs do give up to 15-17ft/L but they are normally high gain screens. The larger the screen the lower the brightness. The actual brightness also depends on the distance from the screen.

The highest white window/field I hv measured is about 15ft/L from the new X3/RS40. The numbers I typically get post calibration are anywhere between 3ft/L to a 15ft/L.

The darker the room the better the picture looks like. Also remember that a large screen with decent brightness always seems brighter to a smaller screen that is almost 10times brighter. This i because the size effect and the amount of light it illuminates on the screen.
TSanfieldude
post Oct 10 2011, 10:06 PM

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QUOTE(pierreye @ Oct 10 2011, 09:40 PM)
BENQ W6k is around 18ft/L brand new. I feel it is slightly too bright to my taste and I mod a fix iris to bring down to around 12ft/L. I feel it's just nice around that figure.

Just spend around 2hrs. calibrating with Lumagen and Panny plasma. Using Calman 4 in interactive mode, I can use Lumagen as pattern generator and also tune directly through Calman without going through Lumagen interface. Try out the 21 point greyscale and gamma which help me to nail a perfect 2.22 gamma plus it solved the slightly pinkish greyscale at 95% white. Also, gamut is almost perfect except blue which is slightly undersaturated.

A quick test with few movies show quite a drastic improvement. The 3D pop is improve and edges seems to be more refine. Skin tone is realistic and the grass looks very natural (using LOTR: The Two Towers). Overall this unit is a keeper. Haven't test out the scaler. I'll try to input 720p from PS3 and scale to 1080p to compare.
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Cool.

I prefered the granularity of the controls in the Lumagen but I believe the new version of Calman is supposed to offer the fine controls as well. It tends to overshoot if u move the interactive too much. But its controls are out of this world. For those with coarse 2 point systems for greyscale and and non working CMS, this solves a lot of problems.
TSanfieldude
post Oct 11 2011, 09:23 AM

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QUOTE(klimal @ Oct 11 2011, 09:08 AM)
What pj are you using?
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Same as u.
TSanfieldude
post Oct 12 2011, 10:49 PM

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QUOTE(htkaki @ Oct 11 2011, 10:31 PM)
Bro, might need your help to tune a JVC projector in Nov/Dec. It will probably be a curved screen.
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No problem. Curved screen huh. Not done to many of those. But its the same.
TSanfieldude
post Oct 13 2011, 11:23 AM

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QUOTE(pierreye @ Oct 13 2011, 09:38 AM)
Anfieldude, need your advice on taking measurement for Plasma TV using off screen method. I read in other forum that mention the dark calibration for every few minutes for i1Pro is due to the temperature fluatuation. I'm thinking to put the probe on a tripod 6 inches from the screen and mod a hood to block out ambient light that will cover the probe to the TV. As plasma panel is quite hot, if I can further distance the probe from the panel, it should not drift too fast.

Also there is another issue with i1Pro too near to plasma panel. I think the FOV is too narrow and for low light reading, the sub pixel dithering might cause inconsistency in the reading. I had post in Spectracal forum regarding the distance for i1Pro from the screen to match i1Display Pro 35 degree FOV but haven't got an answer yet.
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pierreye,

Its a known issue. That is one of the reasons I profile the K-10 to the i1Pro before the temperature drift occurs and then use the K-10 going forward. I hv done tests on plasmas with the i1Pro on the plasma vs off the plasma. Also a freshly dark level calibrated reading vs a non fresh dark level calibrated one. I also did some repeatibility measurements before on a i1Pro left on plasma for extended periods of time. There were differences in the readings but more in the low end where it is reaching the capability of the i1Pro. The high end is pretty decent but as u know the i1Pro does fluctuate a little as well even in the high end. While the errors are still within 1-2 DE its still annoying. I believe it is due to the nature of refresh of the plasmas (or the LCDs, LED backit LCDs) that gives slightly different readings.

The low end below about 5ft/L starts to jump more and is more accurate after a fresh dark cal.

On my plasma, I did not see too much drift with extended heat as long as I did regular recals. So nowadays, I profile quickly then just check once in a while the profiled K-10 vs the i1Pro. The K-10 checks the refresh rates all the time and the readings are almost always the same meaning the repeatibility is fantastically accurate in both the bright and dark areas.

I also know that the FOV issue is a real issue on the OEM idisplay and the i1pro more so for DLPs, so watch out. There is a UHP sync mode that is better, but I am not sure if it is available during profiling. Another LYN member is working thru some problems on this.

Since u r getting a colorimeter, I would not worry so much for now.

Also, on the i1pro the drifts in colour at 75% and 100% are almost neglible even without the dark cal.

I hope to compare the accuracy of the i1pro vs the jeti 1211 when I get the 1211, but I think the difference will be minimal but the jeti will return extremely repeatable results as it aslo checks and locks the refresh rate before each read. Also the jeti does an internal black read before each read.

TSanfieldude
post Oct 18 2011, 10:01 AM

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QUOTE(pierreye @ Oct 13 2011, 03:26 PM)
Thanks for the advice. Doing 21 point color balance and gamma is difficult especially on lower IRE. Pratically I had to redo dark reading for every step to ensure repeatability.

With OEMi1D, the reading is quite consistent and repeatable after profile against the i1Pro. I found out for Panasonic plasma for test pattern at 10 IRE and below, the ABL will auto kick in. You can see that the test pattern after few seconds will automatically dim down. With OEMi1D, I can read the value before it dim now which i1Pro can't due to longer time needed to get the avg reading. At 5% IRE, it measure 0.06 and can drop down to 0.02 after ABL kick in. It's kind of annoying as it is difficult to calibrate for an accurate gamma. ABL also kick in for 85% IRE. I believe that is the reason why previously I can get consistent gamma reading when the contrast is at 60 but once I increase it to 80 to boost light output, ABL will kick in. Only way to get a consistent reading is to use APL test pattern but the AVS 709 test patterrn only had 11 steps.
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Does the abl also kick in for the test patterns from the lumagen. It has 3sizes if I recall. The I shd be able to try the smallest size. The selection shd be under hardware on the left. If not we need to try it on my pattern generator. Is this on the py800?

This post has been edited by anfieldude: Oct 18 2011, 10:02 AM
TSanfieldude
post Oct 18 2011, 03:14 PM

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QUOTE(pierreye @ Oct 18 2011, 01:50 PM)
Yes. It happens with Lumagen test pattern and AVSHD test pattern. This is on PY800.
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What was the peak luminance you are getting with the contrast set at 80? The VT20/V20 could easily hit 38ft/L (with decent gamma at 2.2, dips at 10%), so could the U20. The U30 i did could not hit more than 30ft/l even when I cranked up contrast. It does not clip WTW so that made some changes which I believe is due to energy star requirements.
TSanfieldude
post Oct 18 2011, 06:02 PM

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QUOTE(pierreye @ Oct 18 2011, 05:04 PM)
Well, it depends on the test pattern size. From the Lumagen test patterrn windows medium size, I can get around 26.7ft/L. Small size can go up to 35ft/L. You can see the fluctuation by leaving the test pattern on around 5 seconds for 10 IRE and below or 85 IRE and above. I check out in avsforum and seems like some of them also face the same issue on ABL (Dynamic Contrast that can't be defeated). Some suggest using APL windows to maintain the brightness level across the IRE but no conclusive result yet.
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We could use very small windows that will not trigger ABL. The ABL on the pannys are a little aggresive. More so for the 2011 sets. The Kuros are slightly better especially the 42" and the 50". The 60" are better than most sets except the 42 and 50in.
TSanfieldude
post Oct 19 2011, 09:17 PM

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QUOTE(pierreye @ Oct 19 2011, 08:20 PM)
Redo the greyscale and gamma with Calman 4.4 RC1. 4.3.2 had a bug when using OEMi1D. Now the greyscale tint is no longer an issue except somewhere around 40 IRE. Will re-measure from 30 IRE to 50 IRE with i1Pro to verify the greyscale. Using smaller windows no longer trigger the ABL in higher IRE but the auto dimming at 10 IRE and below still happening.
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Will have to watch for that the next time when I do a panny (10% window). Good to know that the OEMiD is a pretty good meter. Also looks like u r getting the hang of the Lumagen now... smile.gif
TSanfieldude
post Oct 27 2011, 09:50 PM

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QUOTE(klimal @ Oct 27 2011, 06:16 PM)
From AVSforum, coderguy has a new projectorcalculator that also gives the fL figures for BEST MODE.
Usin it, it gives me 18fL for Best Mode, Lamp High.

In actual world, my fL dropped to 10fL after calibration.
If after calibration, the fL drops so much, what is the use of such a calculator sine the results are so far off the mark.

I assume most people will want to have their pj calibrated, but to lose so much fL to such low 10fL is something I am unable to reconcile.
The 'pop' in colours and image will be lost at such low luminence, even for a DLP, IMHO.
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Doc,

Its true. Again, its important to know that most screens do not have as high a gain as advertised. The Best mode with lamp high, is almost always red deficient so in real life the image is tinted green/blue.

10ft/L in a light controlled room is very bright. Remember its 10ft/L on a big screen. It will seem much brighter than 30ft/L on a small screen. The larger the space it illuminates the brigher the image seems.

Most of pjs I calibrate come anywhere between 3-14ft/L. The brightest post calibration so far has been the JVC coming in at around 15ft/L. Pierreye's BenQ comes in slightly higher.

Also take note that since I have the K-10 that is capable of reading low light levels accurately, I did not adjust the K-10 to ensure I was hitting peak light output, more so I adjusted to mimic how ur eye would see it.

By adjusting the angle and working on getting the highest peak output seen by the meter, I could easily have gotten about 20-30% higher.

This post has been edited by anfieldude: Oct 27 2011, 09:53 PM
TSanfieldude
post Oct 28 2011, 06:31 PM

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QUOTE(Keng @ Oct 28 2011, 06:16 PM)
Guys,

Just got myself a 50" FHD plasma & am doing break-in. I'm trying to gather info on how to calibrate the tv later when i've reached say, 100h of playing break-in images.

Do I really need to purchase the calibration tools like mentioned by TS in the 1st page or can I just play certain images with series of colors like how to calibrate a PC monitor?

Your reply is very much appreciated, cheers
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If u want to carry out a complete calibration of your display for greyscale, gamma and colours u would need the tools. If u want to set the basic settings, u can download or get the basic test discs and set brightness, contrast, sharpness by eye.

PC monitors can also be calibrated, running the series of colours without a meter to read is not calibration.



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