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The Official ChromaPure thread - Page 116

post #3451 of 5348
Quote:
Originally Posted by sanderdvd View Post

EDIT:
I also have three more new questions:
4. The manual of Chromapure says that the i1Pro requires an initial dark reading at the beginning and subsequent periodic dark readings throughout the calibration session. Does this also applies to my My i1 Display Pro III Upgraded Pro Version? And if so, what do I need to do exactly?
5. What is the maximum distance from my screen to my My i1 Display Pro III Upgraded Pro Version (which stands on a large tripod)?
6. Dos the my i1 meter has to point EXACTLY to the center/middle of the screen?

4. The i1 display pro III does not require any dark readings.
5. Recommended distance is between 10-15 centimeters (so any heat coming from the screen can be dissipated - contact mode is also valid but due to the heat it is less recommended). . It must not read out of the square of the pattern obviously (that will contaminate your reading)
6. Nope. I sort of put it in the middle. You may get some variances if the screen uniformity is not perfect but do try to center it somewhat:-)
post #3452 of 5348
Thanks again for the quick response Jeroen.

Don t you have the problem that when you put it that close to the screen you have a problem with the shadow of the meter on the screen?
post #3453 of 5348
Yes, with projector screens you would have to tilt it SIDEwards to avoid the shadow. So not vertically. I read there was some sort of issue with vertically but I can't recall the specifics.
Come to think of it. My distance recommendation was for Plasma or LCD, not for projector screens. You may want to get some more opinions on that. Also projectors are calibrated using fields, not windows, so your square will be very large:-)
Edited by Jeroen1000 - 11/29/12 at 4:16am
post #3454 of 5348
Quote:
Originally Posted by Jeroen1000 View Post

Yes, with projector screens you would have to tilt it SIDEwards to avoid the shadow. So not vertically. I read there was some sort of issue with vertically but I can't recall the specifics.
Come to think of it. My distance recommendation was for Plasma or LCD, not for projector screens. You may want to get some more opinions on that. Also projectors are calibrated using fields, not windows, so your square will be very large:-)

I remember reading that as well in the i1 D3 thread. But never followed up on what the real answer is.

I have been aiming it up vertically. I wonder if that is the reason that after I am done with Autocal and I take another overall post calibration reading i get very different results from the finished report right after autocal.

Also what Is the reading cone angle of the D3? Or field of view angle.

Athanasios
post #3455 of 5348
There was a difference of opinion about the vertical or side tilting issue. Derek said it doesn't matter.
post #3456 of 5348
I you don't mind me asking a question too. When we are talking about 10% patterns. Do we mean 10 % of the screen area, or 10% of 1080 x 1920? I have seen some posts talking about "1% patterns". Isn't that way too small?

So we have size in % of screen area:

(Width of pattern * Height of pattern) / (Width of screen * Height of screen) * 100 (to get a percentage)

And the other variant of expression this is 10 % of 1080 x 1920, correct?
Edited by Jeroen1000 - 11/29/12 at 5:57am
post #3457 of 5348
Quote:
Originally Posted by Chad B View Post

There was a difference of opinion about the vertical or side tilting issue. Derek said it doesn't matter.

I believe Tom Huffman made a post about some problem with the D3 angled vertically but I've seen nothing since.
post #3458 of 5348
Quote:
Originally Posted by TomHuffman View Post

You see the problem? I cannot reproduce this issue. My guess is that it has something to do with the D2 and some video drivers, but that's just a guess. Does this problem occur during continuous readings, single readings, or both? Is there anything you can do to force the problem to occur?

Yes I do, yes problem is with contiinous and single measurements, I can't think of a way to replicate it other than just start a calibration . It just happens, where would I find these video drivers on my laptop ?. Would it be any use uninstalling them and start over?.

Maybe the best bet is to get in touch with the guy I purchased it from.

Thanks for your replys.
post #3459 of 5348
Quote:
Originally Posted by mlg33 View Post

Thanks.
Regarding the gamma :
You say there are three ways of adjusting gamma to achieve the flattest gamma response possible within the prescribed range :
- Adjust Brightness and Contrast,
- Select from various gamma presets,
- Adjust the luminance output at each level of stimulus. -> How can I modify this setting ?
Is there any option on my Plasma V20 that can offer this possibility ?
I have access on my Plasma for :
Contrast
Brightness
Colour
Sharpness
R-Gain
G-Gain
B-Gain
R-Cutoff
G-Cutoff
B-Cutoff
R-Hue
G-Hue
B-Hue
R-Saturation
G-Saturation
B-Saturation
Gamma (S Curve / 1.8 / 2.0 / 2.2 / 2.4 / 2.6)
Thank you very much.
I don't think that the VT20 has this capability. All you have access to is gamma presets. You can fix this by adding a DVDO Duo or Lumagen processor.
post #3460 of 5348
Quote:
Originally Posted by MaDBeN View Post

Probably really simple procedure to do but could someone please walk me through how to work out the black and white luminance BT.1886 override values for the autocal section? I have an i1 Display Pro III meter and a Tecpel 531 light meter and would like to calibrate my JVC 990 projector with a 130inch diagonal 2.40:1 Seymour Screen.
Thanks guys
You need to be able to measure the black level and white level of your projector in Luminance. You should be able to do this simply by measuring black and 100% white directly off the screen. Just input those values in cd/m2 into the boxes, and be sure to check the override boxes.
Edited by TomHuffman - 11/29/12 at 7:00pm
post #3461 of 5348
Quote:
Originally Posted by Chad B View Post

There was a difference of opinion about the vertical or side tilting issue. Derek said it doesn't matter.
I made this statement way back when I got the very first units of the D3. It may even have been in beta. I noticed that tilting the meter upwards measurably lowered the luminance reading, whereas tilting sideways did not. I can re-test this tomorrow. I actually hope that it doesn't matter, as this will make setup more straightforward.

BTW, anyone can test this easily enough. I just ran out of D3s today and won't have stock until tomorrow afternoon, so I can't test it right now.
Edited by TomHuffman - 11/29/12 at 5:15pm
post #3462 of 5348
Quote:
Originally Posted by JimP View Post

Tom,
Saw a discussion over in one of the other threads about using small APL windows for certain plasmas with aggressive ABL circuits such as the Panasonic 65VT50.
In doing your calibrations, have you found that small APL windows work better on the VT50s over large APL windows?
I don't see any advantage to using a window smaller than about 10%.
post #3463 of 5348
Quote:
Originally Posted by Jeroen1000 View Post

I you don't mind me asking a question too. When we are talking about 10% patterns. Do we mean 10 % of the screen area, or 10% of 1080 x 1920? I have seen some posts talking about "1% patterns". Isn't that way too small?
So we have size in % of screen area:
(Width of pattern * Height of pattern) / (Width of screen * Height of screen) * 100 (to get a percentage)
And the other variant of expression this is 10 % of 1080 x 1920, correct?
10% of screen area.
post #3464 of 5348
Quote:
Originally Posted by nashou66 View Post

Bumping this from last page.
Nashou
No, if you only select Advanced Gamut 125 point, then the grayscale and gamma will not be touched. Be sure to use the same gamma target and method on the 125-point as you use on the grayscale.
post #3465 of 5348
Quote:
Originally Posted by TomHuffman View Post

I don't think that the VT20 has this capability. All you have access to is gamma presets. You can fix this by adding a DVDO Duo or Lumagen processor.

You are right. There nothing I can do about it on my V20. I should buy a VT50 then ! wink.gif

Beside, here my gamma curve after some tweaking :



Before 20%, it falls down... hard ! eek.gif
What do you think ?

(i1D3 PRO)
post #3466 of 5348
When I select/initialize the meter and choose 'Front_Projection_Screen' I get a notification 'Please remove the diffuser from the lens'. What does this mean?

EDIT: I also cannot click on 'Apply Mode'. It s greyed out.....
Edited by sanderdvd - 11/30/12 at 11:30am
post #3467 of 5348
Quote:
Originally Posted by mlg33 View Post

You are right. There nothing I can do about it on my V20. I should buy a VT50 then ! wink.gif
Beside, here my gamma curve after some tweaking :

Before 20%, it falls down... hard ! eek.gif
What do you think ?
(i1D3 PRO)
That is the display's design.
post #3468 of 5348
Quote:
Originally Posted by sanderdvd View Post

When I select/initialize the meter and choose 'Front_Projection_Screen' I get a notification 'Please remove the diffuser from the lens'. What does this mean?
EDIT: I also cannot click on 'Apply Mode'. It s greyed out.....
It means rotate the diffuser away from the lens of the meter.
post #3469 of 5348
How do I do that? I don t understand.......frown.gif
post #3470 of 5348
Quote:
Originally Posted by sanderdvd View Post

How do I do that? I don t understand.......frown.gif

The diffuser IS the cover over the lens. Pull out slightly and rotate.
post #3471 of 5348
De diffuser is de kap die aan je meter vast zit. Als je die iets naar voren trekt kan je hem voor de lens weg draaien. Dat is je diffuser.

Sorry about the Dutch, figured in this case it explained a bit easier.
post #3472 of 5348
Quote:
Originally Posted by TomHuffman View Post

Absolutely.


Thanks, Tom,

So for that display, there is no benefit in getting the D3 PRO meter?

bob
post #3473 of 5348
Quote:
Originally Posted by spongebob View Post

Thanks, Tom,
So for that display, there is no benefit in getting the D3 PRO meter?
bob
Whoa! No I didn't say that at all. You asked if it would "work fine" and I said yes. Working fine and working optimally are not the same. You will get the same benefit with a D3 PRO over a stock D3 as one would normally expect.
post #3474 of 5348
Ok, this is how an urban legend gets started.

Way back when the D3 was still in beta I noticed that angling the meter upwards when measuring a front projection screen lowered the luminance reading noticeably. When angling the meter side-to-side I did not see this. Hence, I have always recommended sideways angling to avoid reading the shadow of the meter.

I just re-tested this and I saw no difference whatever. Use whichever method suits your installation.
Edited by TomHuffman - 12/1/12 at 7:27pm
post #3475 of 5348
Quote:
Originally Posted by TomHuffman View Post

Whoa! No I didn't say that at all. You asked if it would "work fine" and I said yes. Working fine and working optimally are not the same. You will get the same benefit with a D3 PRO over a stock D3 as one would normally expect.


Sorry,

Didn't meanto put words in mouth!.

Please explain "optimally" then? Really trying to decide if the price difference of the PRO model is justified for a DIY like me.

bob
post #3476 of 5348
Quote:
Originally Posted by spongebob View Post

Sorry,
Didn't meanto put words in mouth!.
Please explain "optimally" then? Really trying to decide if the price difference of the PRO model is justified for a DIY like me.
bob
You will get additional accuracy and a calibration report for $150. I can't tell you exactly how much additional accuracy you will get until I profile the meter.
post #3477 of 5348
Removed the diffuser and now it works.

Another (noob) question:

I have a front projector and I m measuring my screen. My i1 Display Pro III is aimed at the center of the screen at 35cm from the screen. I ve angled it a bit to the right so it does not read it s own shadow. But how do I know if it s not still reading some part of it s own shadow??
post #3478 of 5348
As with any meter and software, you should put up a 100% white pattern and take a contentious reading while moving the meter ever so carefully up down left fight to achieve the highest light output. Depending on your screen type and gain a very tiny amount of movement can make a difference.
post #3479 of 5348
Thxz for your replies guys.

New question (i m learning a lot already so the questions will become less overtime ):

How can take measurements on the same pc with both mpc and chromapure? I mean, I can t push the measure button in chromapure if my mpc shows the needed fullscreen test patterns....... Do i need a second pc eg.laptop just for chromapure?

EDIT:
Quote:
take a contentious reading while moving the meter ever so carefully up down left fight to achieve the highest light output
Can you tell me specific how I can do this exactly with Chromapure?
Edited by sanderdvd - 12/1/12 at 11:37am
post #3480 of 5348
On the left in Chromapure there is a section called "raw data" . There you can select 100% white, then check the box that says "continuous" and click "measure". You will then see the luminance of that pattern in either cd/m of ftl, depending on what choice you made in the settings section. Redardles, aim the meter until the number is at its highest.
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