Basic Guide to Color Calibration using a CMS (updated and enhanced) - Page 53 - AVS | Home Theater Discussions And Reviews
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Old 03-08-2010, 08:07 AM
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Quote:
Originally Posted by TomHuffman View Post

A CIE chart doesn't show dE values. All it shows is a rough visual indication of hue and saturation errors.

That's what I thought. Was was referred in post #1555?

thx

bob
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Old 03-08-2010, 08:09 AM
 
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Thanks Tom, and I do like the AVS disc pattern for Contrast and Brightness.

So, if I feel there is some crush/detail loss at 2.33, then I should set brightness properly and reduce the gamma slider(-3 to -2 or -1) to get closer to a 2.2 curve?
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Old 03-08-2010, 08:09 AM
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Quote:
Originally Posted by TomHuffman View Post

I want to comment on this because it has come up before. As I tried to make clear in the original post, the 2.2 advice for setting brightness should only be used as a way making a more precise adjustment to the one you have already made visually using a pluge pattern. In fact, the AVSHD has a kind of pluge pattern for setting brightness that is so precise that no further aid is necessary.

.

Tom

Where on the disc is that?


thx

bob
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Old 03-08-2010, 08:10 AM
 
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Check the AVS709 thread and download and burn it.
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Old 03-08-2010, 08:10 AM - Thread Starter
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Quote:
Originally Posted by spongebob View Post

That's what I thought. Was was referred in post #1555?

The dE value of a color is a more accurate and comprehensive way of determining its accuracy than its position on a CIE chart.

Tom Huffman
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Old 03-08-2010, 08:11 AM - Thread Starter
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Quote:
Originally Posted by ElwayLite View Post

Thanks Tom, and I do like the AVS disc pattern for Contrast and Brightness.

So, if I feel there is some crush/detail loss at 2.33, then I should set brightness properly and reduce the gamma slider(-3 to -2 or -1) to get closer to a 2.2 curve?

Any gamma response between 2.2 and 2.35 is fine. Try to get it as linear within that range as possible.

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Old 03-08-2010, 08:15 AM
 
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Quote:
Originally Posted by TomHuffman View Post

The dE value of a color is a more accurate and comprehensive way of determining its accuracy than its position on a CIE chart.

When adjusting Tint/Cyan, using your method, I use the dE level too. On the 21% Red vs White, would the dE value be best for this too, or just trying to hit the 21% number?
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Old 03-08-2010, 08:34 AM
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Quote:
Originally Posted by ElwayLite View Post

*) I have tried both Gamma 2.25 and 2.33, using the Gamma slider on the tv, and feel 2.33 loses a little bit of detail (appears to crush a bit). It also is not close to the 2.2 gamma at 10% Tom recommends.

Although he takes some pains to clarify this in the first post as well as here and elsewhere I think it's time to modify item 4.
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Old 03-08-2010, 08:39 AM
 
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Its looking like I should reset user settings, adjust bright and contrast, tighten up grayscale, then check the gamma slider starting at 0, and see which setting gives me the flattest line between 2.2 and 2.3. Then go back and check the other settings.
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Old 03-08-2010, 08:59 AM
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Quote:
Originally Posted by ElwayLite View Post

Check the AVS709 thread and download and burn it.

I have it. Wondered what pattern Tom was referring to?


thx

bob
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Old 03-08-2010, 09:21 AM
 
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I assumed it was the standard brightness pattern where you want bars 17 and higher showing and 16 and below off.
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Old 03-08-2010, 09:22 AM - Thread Starter
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Quote:
Originally Posted by ElwayLite View Post

When adjusting Tint/Cyan, using your method, I use the dE level too. On the 21% Red vs White, would the dE value be best for this too, or just trying to hit the 21% number?

dE is a comprehensive method for grading color difference. 21%-of-white is simply a straightforward way to set the brightness of red correctly. Since the Color control has the biggest effect on color brightness (within a reasonable range of adjustment), it's a good way to adjust the Color control.

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Old 03-08-2010, 09:26 AM
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Quote:
Originally Posted by TomHuffman View Post
The dE value of a color is a more accurate and comprehensive way of determining its accuracy than its position on a CIE chart.
Tom

Can you look at this reading and tell me why Magenta's de is 28, even though it looks closer than yellow that has a de of 8.9?

This is from a Pio PRO-101FD.

thx

bob

 

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Old 03-08-2010, 09:26 AM
 
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Quote:
Originally Posted by tomhuffman View Post

de is a comprehensive method for grading color difference. 21%-of-white is simply a straightforward way to set the brightness of red correctly. Since the color control has the biggest effect on color brightness (within a reasonable range of adjustment), it's a good way to adjust the color control.


10-4.
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Old 03-08-2010, 09:37 AM
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Quote:
Originally Posted by TomHuffman View Post

A CIE chart doesn't show dE values. All it shows is a rough visual indication of hue and saturation errors.

Using, HCFR, when I hover my mouse over a reading on the CIE chart, It gives me a de reading. Am I missing something?


thx

bob
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Old 03-08-2010, 10:05 AM
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Quote:
Originally Posted by ElwayLite View Post

I assumed it was the standard brightness pattern where you want bars 17 and higher showing and 16 and below off.

I have trouble with that pattern

bob
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Old 03-08-2010, 10:13 AM
 
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Quote:
Originally Posted by spongebob View Post

I have trouble with that pattern

bob

??
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Old 03-08-2010, 10:33 AM
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Quote:
Originally Posted by ElwayLite View Post

??

hard to distinguish the difference in the flashing bars. I think there are better pluge patterns.


bob
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Old 03-08-2010, 10:52 AM - Thread Starter
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Quote:
Originally Posted by spongebob View Post

Using, HCFR, when I hover my mouse over a reading on the CIE chart, It gives me a de reading. Am I missing something?

No, that's just something HCFR provides. It is not part of the CIE chart itself.

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Old 03-08-2010, 11:19 AM
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Quote:
Originally Posted by spongebob View Post

hard to distinguish the difference in the flashing bars.

That's because you have an Elite monitor (or it's too bright for proper calibration) -- although they might reduce the brightness of the labels in the next version which is also a problem for Kuro monitors in a light controlled environment.
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Old 03-08-2010, 02:04 PM
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If you guys have HCFR, can you check mile file above (#1573) and see why the magenta Delta E is so high compared to where it is on the chart and compared to the other colors?


thx

bob
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Old 03-08-2010, 02:18 PM
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Quote:
Originally Posted by spongebob View Post

If you guys have HCFR

There's a thread for C-HCFR reports/advice.
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Old 03-08-2010, 02:30 PM
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Quote:
Originally Posted by bodosom View Post

There's a thread for C-HCFR reports/advice.

Done, but I thought this was CMS related and that most people here used or were familiar with HCFR.

thx

bob
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Old 03-08-2010, 02:34 PM - Thread Starter
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Quote:
Originally Posted by spongebob View Post

Can you look at this reading and tell me why Magenta's de is 28, even though it looks closer than yellow that has a de of 8.9?

This is from a Pio PRO-101FD.

I don't know what you are looking at.
LL

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Old 03-08-2010, 02:45 PM
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Quote:
Originally Posted by TomHuffman View Post

I don't know what you are looking at.

Using HCFR, I am looking at the Delta E readings for the pri/sec. colors. You can check it in the measurements window under primaries and secondaries or you can hover the mouse over the reading on the CIE chart. Magenta DE is 28 and looks to be fairly close on the chart where it should be. Other colors are much closer (Delta E) Sorry if I'm not being clear enough.

bob
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Old 03-08-2010, 02:56 PM
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What Tom's saying is that when we open your file, the dE for the Magenta primary is 7.4, not 28, whether you look at it in the measurements window or hover of the Magenta in the CIE chart.

-Greg
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Old 03-08-2010, 02:59 PM
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Quote:
Originally Posted by spongebob View Post

Done, but I thought this was CMS related and that most people here used or were familiar with HCFR.

thx

bob

I've replied to your post in the ColorHCFR thread. It appears magenta is 7.1% too dim relative to the target luminance.

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Old 03-08-2010, 03:40 PM
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Quote:
Originally Posted by glaufman View Post
What Tom's saying is that when we open your file, the dE for the Magenta primary is 7.4, not 28, whether you look at it in the measurements window or hover of the Magenta in the CIE chart.
I must be having a twilight zone day, then

It says DE 28 when I open it. I'll post again after i just confirmed that.

I did get your response on the other thread, Plasma. Thanks

bob

 

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Old 03-08-2010, 03:55 PM
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Check what you have set as your references.

-Greg
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Old 03-08-2010, 04:35 PM
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Quote:
Originally Posted by glaufman View Post

Check what you have set as your references.

REC 709.


thx

bob
LL
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