The Official ChromaPure thread - Page 2

Hi Tom i justed signed up for the PR-655 promotion and should be getting my gear in a couple of weeks. Your software looks like something i would like to have as part of my arsenal, any plans on supporting the Photo Research gear?

Yep. We are adding features as fast as we can get them developed and fully tested. Support for PR units is definitely on our roadmap.

Fantastic. Any timeframe on when we can expect to see support for the gear?

Best guess is 1st or 2nd quarter of 2010, when we release version 2.0.

I can echo JimmR's comments about Chromapure. I am fairly novice at calibration, but the layout of the software and the implementation of each step really make it easy to use as well as informative. I am not much for writing reviews, but I did find a good comprehensive review on Chromapure.

http://www.videovantage.com/?p=318

Chromapure is actually selling version 1.1. When the version 2.0 is ready can the version 1.1 be upgrade to version 2.0 for free or for an additional cost?

Federico

Point upgrades are free for existing users. We will be releasing 1.2 before the X-Mas holidays that will have some often-requested features. Version 2.0 will include new modules and a significant overhaul of existing modules. Upgrades to it will cost existing owners a modest upgrade fee.

JimmyR, you said: "you can't use ChromaPure to measure gamma or other measures 20 different ways but who wants to." I was looking at the Demos on ChromaPure page and it looks like you can measure and adjust gamma. Am I missing something?

Federico

Jimmy can speak for himself, but what I think he meant was that we do not include multiple formulas for calculating gamma.

Thank you Tom. I really like the demos on your page. I just order my copy of ChromaPure. Waiting to receive it. Do you send an electronic copy or a phisical disc?

Federico

I'll send you a private e-mail.

Tom,

After going through the demos of ChromaPure, I am impressed and interested. Have used HCFR with my DPT94 for some years to calibrate my old TV.
Now with a new LG 55LH90 Your software seems like logical choice. But,
The DPT94 is about 6 years old having been purchased originally to calibrate computer monitors for photo edit accuracy. The meter is kept in a sealed plastic bag with a dozen silica gel desiccant packages. The desiccant is refreshed about once a year by baking at 80 to 100 degrees F.

How will I know if the meter is still accurate ?, would the D2 bundle be a better choice. Yes, the Chroma V is a great meter but how would it stand up if used only once or twice a year. Not into professional calibration, home user only.

Here is the toolcrib output:
Measurements displayed in CIE 1931 units
Y 0.00 -0.00
x -2.407 -12.3686
y -0.3556 -29.4686
measured on black surface after calibration.
First numbers with toolcrib set to LCD and second with toolcrib set to RAW


Does this tell you anything about the meter state ?
DPT94
Ser No 011267
Firmware version DB06
Boot version D929
Originally purchased new with Xrite Pro monitor calibration software.

Any thoughts ?

Sent you a PM.

I too am interest in a comparision of D2 to DTP94, I've been using the latter while I save for hte i1Pro, but might buy sooner if the D2 would be a step up from the DTP94?

Without doing a formal comparison I have enough experience with both meters to say that the D2 would not offer better performance than a DTP94--that is, all else being equal. The DTP94 is a good design. To get better performance, you'd have to move up to the Chroma 5.

I understand how you've qualified that, so if I may...
Hoe about not quite all things being equal: the DTP being well taken care of (sealed with dessicants, several years old, not sure exact purchase yr) vs a brand new D2?

If a meter is several years old--even one that's been taken good care of--you may very well benefit from a new meter, even a new DTP94. But I wouldn't expect a new D2 to outperform a new DTP94.

Fair enough, and thanks!
I didn't think a new DTP94 was even an option.

Sure. They are still available.

I only just got this software this week and haven't been able to run a proper calibration yet, but I really like the way it's laid out. I was stuck away on bussiness so I used my laptop to 'play' with the software (just using some MS Paint 'test patterns' ) to get familiar with it. I really like the way you can adjust the gamma in real time, which is a current issue with my HD350 as it has 'flattened' to an average of 2.0.

I'll report back once I've had chance to do a 'real' calibration. I may have some questions, but it seems so well laid out (and the help is good too) I think I'll be good to go after using HFCR for the last year.

Tom,
Since 2.o is coming out soon would purchasers buying software now get a free update?

1.2 will be out late this month. It will be a free upgrade for existing customers. 2.0 won't be out until the 3rd quarter of next year. It will cost existing users a modest upgrade fee.

I did some gamma tweaking last night and adjusted the colour gamut a little using my Lumagen HDQ (so it was an exercise in compromise ). I was happy with the results and found it much easier to dial in the gamma to follow 2.2 using the real time display while I adjusted each point using the HDQ's luma controls. Also the real time colour gamut measurements made finding the 'sweet spot' compromise quicker than I'd ever manage with my previous free software.

I did run a final greyscale check using the Chromapure and my old software for comparison and found a big difference in the delta E for greyscale. I've now realised that my old software was using 'CIELUV' and I'd set the Chromapure option to 'CIE94', so Chromapure reported delta E values apporximately half what my previous software measured.

So, should I beat myself up and recalibrated greyscale using 'CIELUV' or relax seeing that 'CIE94' is pretty much within 'detectable by eye' limits?

The image does have more depth now I've sorted the gamma (it was below 2.0 without using the HDQ, but very difficult to adjust before I had Chromapure to help). I'm planing on moving onto my JVC HD350 soon, which is my most critical viewing, hence the questions here.

Overall I'm very pleased with Chromapure so far....I know my sensor is not the best, but it's much better than 'fiddling about' by eye. I may even upgrade to a better sensor in future anyway. Sorry for the rambling post, I'm off work today with a lousy cold and it's relieving the boredom.

Ah, I just did some searching on this and I hope I haven't opened a can of worms here: I'm only interested in which mode I should use when I'm checking the greyscale using Chromapure, not any other software.

I ran through the greyscale and gamut this afternoon, just trying to tidy up my greyscale without upsetting the gamma. I've been pretty successful I feel, though it was suggested elsewhere that I have another run and try to reduce the red further, which I may try later.

The bit I'd really like advice on is the colour gamut adjustments I've made: I only have Lumagen HDQ so not a 'proper' CMS, hence the compromises. I would be interested to hear your thoughts on whether I've made the right compromises or if I should revisit and concentrate on a particular colour. FWIW my HDQ settings for gamut are:

RED: SR 45, AG 18, AB 00
GRN: AR 75, SG 00, AB 00
BLU: AR 20, AG 05, SB 05

As always, I'm grateful for your time and opinions. This is a precusor to doing a more in depth recalibration of my JVC HD350 projector, so I'm using this more as a learning process as the TV isn't such critical viewing as the projector.

 

Sony 40W2000 Calibration Report.pdf 263.166015625k . file

I *think* that this is covered in the Help file, but different dE methods report different numbers and have different tolerances.

For grayscale
CIELUV
5.0 maximum tolerance
CIELAB, CIE94, and CIEDE2000
4.0 maximum tolerance
2.0 or lower for all is essentially imperceptible error

For color
CIELUV and CIELAB
Same as above
CIE94 and CIEDE2000
1.5 maximum tolerance
1.0 or lower for either is essentially imperceptible error

The reason all methods are close for grayscale but so different with color, is that the newer formulas treat the relationship between Lightness (the L in Lab and Luv) and chromaticity differently than either of the 1976 formulas. Grayscale isn't affected by lightness errors at all--that's what we use gamma for.

You have some significant lightness errors for red and green I would work on.

Thanks for your time Tom and the references to the various delta E tolerances.

Showing my ignorance here, but with only the TV's main colour control and the Lumagen's limited gamut control, should I just view a red or green test pattern in real time and adjust these controls? Or is there a more scientific way to approach it given the settings I've already used?

I don't expect perfection without a proper CMS and I'm not too worried for the TV as it's only day to day SD stuff...the kids and missus are quite happy with it as it stands, it's more of a test bed for me to learn on.

Turning the TV's main Color control up a 2 or 3 ticks might help.

Thanks for the hint Tom, I'll give that try....I'm getting ready to do my HD350 this software makes it so easy to work though in a logical order and I'm really made up with the real time gamma adjustment tool. If I can get the greyscale and gamma as close on the HD350 as my TV now is, then I'll be quite happy pending a CMS device later on.


EDIT: The tolerances for delta Es is in the help section under 'Interpreting the Calibration report' as I was looking for something else just now and found it.