The Official ChromaPure thread - Page 78

Originally Posted by .:GRiFFiN:.

This happens to me on my plasma display.
What I do is use the whitebalance continous mode to set it and to check.
The when you want to make a full run to get a curve, just check the 10ire at continous mode in whitebalance, let it stabilize - remember the percentage, then go to the postcalib and just remeasure until you get the reading that you know is right from the continous mode.

The continous mode is the correct one so it doesnt really matter what the curve screen says but I know, sometimes one wants to post a curve or just to try and see the whole picture (if its difficult to get it spot on one might need to compromise)

It was a pain in the butt when I used 3 measurements but it helped when changing it to 1 reading. Its only 10 and maybe 20 that will have this big problem tho, but the rest of the curve can also faulter in small percent.

Originally Posted by HomerJau

There are 64bit drivers you will need to install from Chromapure for Win7 x64

Originally Posted by flint350

I don't believe this is correct- and besides, it works on the laptop which is also Win 7 64 bit and both computers are up to date on all drivers. I still can't figure out why the desktop version of Chromapure/Windows can't see the Display 3 Pro. Since Windows reports it as a recognized HID device, it seems Chromapure should recognize it as well, like it does in the laptop. I'm pretty sure Tom has said earlier that you can install on 2 different computers as long as you are using the same, licensed device (I am). Mystery continues.

Originally Posted by flint350

I don't believe this is correct- and besides, it works on the laptop which is also Win 7 64 bit and both computers are up to date on all drivers. I still can't figure out why the desktop version of Chromapure/Windows can't see the Display 3 Pro. Since Windows reports it as a recognized HID device, it seems Chromapure should recognize it as well, like it does in the laptop. I'm pretty sure Tom has said earlier that you can install on 2 different computers as long as you are using the same, licensed device (I am). Mystery continues.

Originally Posted by TomHuffman

You can also just set Measurement Smoothing to take 5 or 6 readings when measuring 10% and then set it back to 1 for the remainder of the grayscale. As I think I mentioned before, this problem is most evident on plasmas.

Originally Posted by .:GRiFFiN:.

This happens to me on my plasma display.
What I do is use the whitebalance continous mode to set it and to check.
The when you want to make a full run to get a curve, just check the 10ire at continous mode in whitebalance, let it stabilize - remember the percentage, then go to the postcalib and just remeasure until you get the reading that you know is right from the continous mode.

The continous mode is the correct one so it doesnt really matter what the curve screen says but I know, sometimes one wants to post a curve or just to try and see the whole picture (if its difficult to get it spot on one might need to compromise)

It was a pain in the butt when I used 3 measurements but it helped when changing it to 1 reading. Its only 10 and maybe 20 that will have this big problem tho, but the rest of the curve can also faulter in small percent.

Originally Posted by mdrew

Any tricks to using the internal test patterns with the lap top connected to a JVC RS20?

I attempted to do this without any luck. I suspect it is a cable issue. I am using a Keyspan USB to serial, the same set up I use for my Radiance, but I can not get the test patterns to display on the projector. It is a Null modem cable if that matters.

Originally Posted by khollister

I'm not a projector guy, but the DB9 (RS232) connector on your PJ is for computer control, not sending image data. You need a Dvi-to-HDMI cable unless your laptop has a HDMI output. Basically you are trying to route your desktop over USB - that ain't happening (as you have found out).

Originally Posted by mdrew

I tried using the PC connection and I can move my desktop to the projector, but I can use the projector's menu for some strange reason.

The Chromapure instructions says to use either USB or RS232.... I have no idea how it sends the display test patterns.

Originally Posted by msamblanet

Tom,

Do you have any plans to support reducing the white level in auto-cal to deal with undersaturated colors?

I have an RS-45 and a Lumagen. I found I can correct much of the undersaturation of cyan with a slight reduction in the white, but when I use auto-cal, the first thing it does is zero out all the settings...

My thought was an auto-cal option to specify I want the white point lowered by X% (or just not zero it) would accomplish this...

Originally Posted by Kilgore

You have to set white level (Contrast) and black level (Brightness) in the display, not the Lumagen.

Originally Posted by khollister

I think you are misreading the manual - the only reference I see to this is in the Signal Generator section and it tells you to use a USB or RS232 connection to an external signal generator to control it (e.g. an Accupel), not to send the internal patterns to a display.

Originally Posted by PE06MCG

ACM already has an option to measure various amplitudes as well as saturations.
How is the diagnosis changed?

Originally Posted by TomHuffman

There has been some discussion here and elsewhere about issues arising from calibrating one of the new Sharp Elite LCDs.

I have now had more time to spend with one and here's what I found.

[*]Select the THX mode.[*]You can leave the dynamic LED function on, but not in one of the advanced modes.[*]Use the 10-point grayscale feature. It yields excellent results. You can get nearly perfect grayscale tracking with a ruler flat gamma at 2.2.[*]I would not spend any time on the color management system, but if you do ensure that you use 75% intensity test patterns. You cannot get decent results with 100% patterns at all.

The problem with the CMS is that the colors on the Sharp will not track in a linear fashion between 100% and 75% intensity (as indicated above). Color will also not track in linear way throughout the color space. This is true even if you use an external CMS, such as provided on a Lumagen or DVDO Duo. When you average the dE results throughout the color space (and not just at the gamut boundary), you get no better color after calibration than you had before doing anything. This is not as bad as it sounds, because the default color in the THX is pretty good anyway.

After calibrating using 75% test patterns, I got excellent results at the gamut boundary, and if that's all you looked at you would think that you had significantly improved the color performance. However, that's an illusion that is revealed when you look inside the color space.

Note: The ACM module in ChromaPure uses 100% intensity test patterns. Based on this experience we will add 75% patterns as a user-selectable option. Nonetheless, the point remains that good color performance should results in little or no difference between 75% and 100% intensity. With this display, the differences are dramatic.

THX pre-calibration

Post-Calibration results

Results with Lumagen

Variations in luminance error at different levels of saturation

Variations in dE at various levels of saturation

Originally Posted by Pannus

I guess my question is, how can we generate the 75% patterns? I have a Sencore and a Lumagen as a pattern generator... use lower initial saturation settings on the set itself or lower stimulus settings?

Originally Posted by catmother

This is how I calibrate my LG 55LH90, an LED full backlit LCD with local dimming and it works well for me but make no claims for FP, DLP and plasma sets.

0. I always verify that the LH90 color gamut is set to wide since the Duo can only decrease saturation from the display's upper limit. I also leave LD on.
1. I always verify black and white levels using AVCHD burned to a BD25 and running on a Panasonic 210 BD player.
2. Then verify clipping with S&M since I like those clipping patterns.
3. Then bring up the Gamma module in CP Pro and with the Duo CMS disabled adjust RGB for a flat Gamma from 100 to 10 IRE. This usually involves reducing green and of course adjusting Red and Blue for equal percentages to green.
4. Then enable the Duo CMS and run the auto cal module.

All this with the D3.

Since the Duo only supplies 100% color saturation patterns I have not tried the Advanced CMS in CP on the supposition that to do do would require running AVCHD on the 210 and wondering whether using two different pattern sets would introduce errors.

That is about it for now but when Tom adds fine Duo CMS color adjustment to CP it will be time to repeat the calibration.

BTW, rowland-johnson does use the advanced CMS and calibrates his 47LH90 at 75% saturation since he found his set to be non-linear in that 75% and 50% were under saturated after calibrating at 100%.

Finally I examine scenes from the Torrey Pines and Pebble beach golf tournaments recorded on the Tivo and closely examine these for color fidelity. Since I live about 5 miles south of Torrey Pines I know what the scenery looks like. At this time I am satisfied that the LH90 performs very well.

And yes, I have the standard (non-compensated) C5 but have not used it since acquiring the D3.

Consider buying the Imax rendition of "Under the Sea"
Unlike most Imax movies which were originally authored for movie theater viewing and subsequently re-authored for home viewing, this one was authored at the outset for home viewing on a BD player. It plays in 3D or 2D and contains scenes from coral reefs near Fiji and the Great barrier reef. The colors are phenomenal.
While expensive for a 41 minute movie it is well worth it to check the calibration results visually.
In fact many ISF trained calibrators use this movie as a final check.

3D demos in stores often use scenes from this movie as was the case when I saw a demo of the LG 55LW5600 at Fry's a few months ago. The 3D effect is stunning and almost makes me wish for a 3D capable TV.

Originally Posted by SteveWK

I think your observation with the DUO not being able to increase saturation is not a problem with the DUO. I think it is what the TV considers fully saturated color and it won't display anything beyond what it thinks the color gamut is.

Originally Posted by khollister

I think it may be quite a bit simpler - the hardware cannot physically output a 100% saturated blue per the target gamut and no amount of increased drive can force the panel to output something it is physically incapable of doing. Basically, you have saturated the panel.

Same thing with color printing - no amount of screwing around in Photoshop can make up for the fact that an inkjet printer's ink set can only reproduce a certain gamut. You can't make make R, G or B (or CMYK) more saturated than the ink is capable of just because you dialed saturation in PS to "11".

Originally Posted by thrang

Some innovators have done so...

Originally Posted by thrang

Some innovators have done so...

Originally Posted by Kilgore

Tom, are you aware that CalMan allows you to choose three different size grayscale and color window patterns when using a Duo? Is it possible for ChromaPure to access this feature, or has CalMan secretly bought their way into some exclusive deal to allow this feature for themselves but not for anyone else?