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Old 10th December 2012, 01:06   #801  |  Link
cyberbeing
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@MSL_DK

Tiny changes in XYZ values are causing yCMS to produce 3DLUTs with drastically different color luminance clipping results. If you have better results using measurements from one source compared to another, it's just a fluke. This is likely the same madVR forced TV range on PC range test pattern bug which has existed since early yCMS versions.

Last edited by cyberbeing; 10th December 2012 at 01:43.
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Old 10th December 2012, 06:38   #802  |  Link
MSL_DK
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Quote:
Originally Posted by madshi View Post
Are you taking the measurements by running color test patterns through madVR?

...If you use madVR, you should set madVR to "this display is not calibrated" when you display the color test patterns.
I have done so far. That's how I have achieved these strange results where red is cut.

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Originally Posted by madshi View Post
Or are you using some other software to display the test patterns?
Here I have installed HCFR on my htpc and run "show images" and enter the values ​​in madvr.
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Old 10th December 2012, 07:03   #803  |  Link
MSL_DK
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Quote:
Originally Posted by cyberbeing View Post
@MSL_DK

Tiny changes in XYZ values are causing yCMS to produce 3DLUTs with drastically different color luminance clipping results. If you have better results using measurements from one source compared to another, it's just a fluke. This is likely the same madVR forced TV range on PC range test pattern bug which has existed since early yCMS versions.
Refer you to this post?

Quote:
Originally Posted by MSL_DK View Post
I am somewhat confused and not sure I am able to explain to me technically. I have just a few questions. My gfx is set to full rgb madvr to 0-255 and my TV is set to (EDIT) PC levels. Before ycms will rgb clip 235 and after ycms at 251, why?
My settings are of course:

GFX: 0-255
madVR: 0-255
TV: PC levels (0-255)

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Old 10th December 2012, 10:54   #804  |  Link
cyberbeing
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Quote:
Originally Posted by MSL_DK View Post
My settings are of course:

GFX: 0-255
madVR: 0-255
TV: PC levels (0-255)
That test pattern is PC Range video, flagged as TV Range.

So for your setup...

madVR input range: 16-235
madVR output range: 0-255
GFX: 0-255
TV: 0-255

yCMS has a problem maintaining identical luminance range between Primary colors when madVR treats PC range video as TV range with BTB/WTW, and then expands back to 0-255 (i.e. clipping test patterns).

Last edited by cyberbeing; 10th December 2012 at 11:00.
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Old 10th December 2012, 11:52   #805  |  Link
MSL_DK
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Quote:
Originally Posted by cyberbeing View Post
That test pattern is PC Range video, flagged as TV Range.

So for your setup...

madVR input range: 16-235
madVR output range: 0-255
GFX: 0-255
TV: 0-255

yCMS has a problem maintaining identical luminance range between Primary colors when madVR treats PC range video as TV range with BTB/WTW, and then expands back to 0-255 (i.e. clipping test patterns).
Okay ... I think I understand.

This is not my goal, but I have tried with

madVR: 16-235
GFX: 0-255
TV: 16-235

This does not solve the problem. I still get this weird result
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Old 11th December 2012, 23:16   #806  |  Link
yesgrey
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I'm following, and will look into this carefully next week, when my Christmas holiday starts.

Thanks for reporting the problems.
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Old 12th December 2012, 19:01   #807  |  Link
MSL_DK
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Quote:
Originally Posted by yesgrey View Post
I'm following, and will look into this carefully next week, when my Christmas holiday starts.

Thanks for reporting the problems.
Thanks and Merry Christmas :-)
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Old 28th December 2012, 14:56   #808  |  Link
fallengt
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Quote:
Originally Posted by 6233638 View Post
He is using CalMAN v5 there, which also takes those measurements. (as you can see from the image he posted)

The issue is that yCMS only allows you to specify primaries and greyscale points, there is no option to create a custom LUT to fix hue/saturation errors below 100%.

Most displays are far from linear below 100%.
+1
I would be nice if yCMS supported gamut correction below 100% sat.
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Old 1st January 2013, 21:07   #809  |  Link
MSL_DK
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Quote:
Originally Posted by yesgrey View Post
I'm following, and will look into this carefully next week, when my Christmas holiday starts.

Thanks for reporting the problems.
Hi ... How do things look?
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Old 7th February 2013, 23:37   #810  |  Link
n3w813
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Quote:
Originally Posted by fallengt View Post
+1
I would be nice if yCMS supported gamut correction below 100% sat.
+1

It would be great if you can add support to input 3dLUT to correct the entire color gamut, not just the edges.

Maybe a 5x5x5 (125-pt) 3DLUT correction??
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Old 19th February 2013, 04:33   #811  |  Link
hulkss
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Creating a 3D LUT for madVR Color Correction

I posted some instructions that work for me over at the JRiver forum: How To Get Perfect Video Color
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Old 19th March 2013, 21:46   #812  |  Link
n3w813
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Quote:
Originally Posted by hulkss View Post
I posted some instructions that work for me over at the JRiver forum: How To Get Perfect Video Color
Although this method does correct the hue and saturation of the color gamut below 100% saturation, it does NOT produce correct luminance values(Y) for the points. Average DeltaL are increased anywhere from 5 to 20+.
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Old 11th April 2013, 10:50   #813  |  Link
browser
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Quote:
Originally Posted by fallengt View Post
+1
I would be nice if yCMS supported gamut correction below 100% sat.
+1

Also a gamma per color correction would be very nice !
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