Basic Guide to Color Calibration using a CMS (updated and enhanced) - Page 54

And the white point?
Attachment 169475

Sorry, Not sure what you mean. I do check white when doing a run but I see the missing data. All my runs are missing the white delta e numbers but I have no idea why!


thx

bob

I meant what white point are you using for a reference?

I try to remember to set it at D65 but it doesn't save in the preferences.

I could have forgot before this run. Would that make a difference?

thx

bob

I think so. Open your file, play with the white point reference setting, and see how your DE changes.

No difference.

thx

bob

Strange, it did on my end. What version HCFR are you using, and on what OS?

Version 2.0, Vista 32 bit.

What is strange is when I go to preferences and check the D65 box, it won't let me apply (grayed out). Because it's already selected?

bob

Sorry, changed to D75 or D55, big change on chart.


bob

So what does the dE become with D65 as the reference?
You could try upgrading to 2.1.0... but for the record, I'm running 2.0.1 here at work...

My first charts are correct @ D65. I couldn't change to D65 cuz it was already set there LOL.

What about colorspace 1 or 2 on the Kuro? Would changing that give different RGB/CIE numbers?


thx

bob

I would probably give different numbers, but what the display is putting out isn't as much the problem as why you're getting different dEs out of HCFR than the rest of us...
do you have another file open you're using as a reference measure?

No other files open. have closed and opened HCFR many times, same numbers. Any other settings that could be it?

BTW, what de are you guys getting for magenta, again?

thx

bob

I'm looking at this!

bob

I'm downloading 2.1 right now. Was running 2.0.

Thanks, Tom

bob

edit: 2.1 Fixed it !!!

Tom,

What is the Yx value on the spreadsheet? I'm trying to learn about CIE94, etc and want to enter my HCFR readings into the chart. What is the HCFR equivalent?

thx

bob

Hey Tom, don't want to derail your thread, but I was wondering what your take is on local dimming lcd's. Calibrate on or off? I understand you can use full field patterns on the AVS disc, and once you calibrate with it off or on, you have to leave it that way. I'm coming to the opinion that LD on looks real good, but kills detail.

Have you calibrated any LD sets?

Thanks. What I've found, is that overall, I prefer the LD on, but it definitely has its issues. IMHO, this keeps Plasma as the top tech. The Regza is real hard to dial in with LD off, and deltaE's under 3 are hard to come by. Much better with it on.

I goofed around last night and found I was able to get more light output with a lot less backlight and contrast, by turning off the scanning backlight and it also allowed for a much straighter gamma line at 2.32. Dunno why the scanning backlight would effect gamma(part of it is prob the lower backlight and contrast), but it does. I'm amazed at how diff features effect different things between the brands and models. I feel for professional calibrators.

You are too modest Tom.
Using ChromaPure and a Chroma 5 to calibrate the 55LH90 the results are very good. More importantly OTA and even CATV look great on my set.
http://www.avsforum.com/avs-vb/showp...&postcount=331

This calibration was done with LD on and field patterns using the ChromaPure pattern disc playing on a Panasonic S97 SD DVD player.

It doesn't look like this has been Posted anywhere yet , but for those of you interested in Poynton , here is a Link (pdf) of the first Article that SpectrCal will be hosting...

http://storage.pardot.com/2742/29527...r_Mar_2010.pdf

Enjoy

Scott.................................

nt!, kicking it old-school! Next up stilb.

Hi Tom,
what do you think of the "75% saturation/100% brightness" method to set primary and secondary colors? Basically that's aiming to hit the 75% saturation point for colors instead of the usual 100% saturation point.

http://www.avsforum.com/avs-vb/showthread.php?t=1134710

It makes great sense to me if the display colors are grossly under-saturated at 25/50/75% saturation points.

For example, I calibrated my Samsung A650 plasma using the conventional method of 100% saturation/100% brightness colors (of course after setting brightness, contrast, gamma, grayscale, etc), but was never really happy with the results. I somehow came across the thread linked to above and learned about "75% saturation" and "saturation-luminance" (big thanks to Dan's excellent spreadsheet).

I was quite surprised to see my plasma's performance here. The 25/50/75% saturation points for most of the colors were well short of the mark. Here is the color gamut AFTER I tried my best to use 75% saturation method. The Samsung primaries and secondaries can't be saturated any further, so that's about as good as it gets.



Perhaps more disturbing are the saturation-luminance measurements I obtained. Here are the charts for RED, which are the most problematic (and noticeably incorrect) color. Below are 2 charts. The main color control is set to default in both. In the first chart, the RED brightness is default. In the second chart, the RED brightness (only) was lowered using the Sammie's 3D CMS.





The effect I see of adjusting red brightness is to get the 100% red saturation point close to the correct brightness. But look at 75% saturation and lower! They are too bright. Is there any way I can get this *entire* curve to lie reasonably flat and close to the reference line?

But isn't 75% more "real world" than 100%?


bob

Do you mean 100% saturation/75% stimulus or 75% saturation/100% stimulus? I believe 100% saturation/75% stimulus is better than 100% saturation/100% stimulus since 75% stimulus produces about 50% light output, which is closer to most content than 100% light output.

Maybe what he meant is that in most content 75% saturation is seen more than 100% stauration. Anyway, with my LG 47LH90 I had to choose between getting either 100% saturation right and getting 75% saturation and lower right. Adjusting for a correct 75% saturation response produced the smallest error at the remaining staurations. And, assuming that there was more content at 75% and lower made it easier to accept the tradeoff