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26th December 2016, 15:10 | #41741 | Link | |
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In calibration, what is the difference between pure power curve and bt.709/601 curve? Which should I choose? My tv supports bt.709, dci p3 and bt.2020. gamma 1.9, 2.2, 2.4 and bt.1886. I calibrate the tv using gamma 2.2
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26th December 2016, 21:36 | #41742 | Link |
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Check out the link in my signature, and please let me know if my descriptions for gamma curves don't make sense.
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26th December 2016, 21:44 | #41743 | Link | |
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this display is already calibrated: [BT.709, pure power curve, 2.20] This sets the current display characteristics. This affects the conversions used by madVR when playing video with a different gamut or using the 'enable gamma processing' option in 'color & gamma'. Before asking a question, I first look at that page. If I am not clear, I ask the forum. Maybe when using a TV oled it is better to use X gamma curve.
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"To infinity, and beyond!" Last edited by Oguignant; 26th December 2016 at 22:07. |
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26th December 2016, 21:58 | #41744 | Link | ||
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Last edited by leeperry; 26th December 2016 at 22:01. |
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26th December 2016, 22:17 | #41745 | Link | ||
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26th December 2016, 23:20 | #41747 | Link |
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Dithering on LG 10 bits tv
I found this note that says:
http://www.flatpanelshd.com/focus.ph...&id=1421919922 LG told us that the new 4K OLED TVs use true 10-bit panels – no dithering – and that the built-in HEVC decoder can process 4K HDR at 10-bit, too. Does it mean I have to disable dithering in madvr? |
26th December 2016, 23:35 | #41748 | Link | |
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I use BT.2020 for dark room viewing, on your OLED TV that is probably equivalent to pure power 2.4 gamma. You could calibrate to 2.4 but then have madVR convert to 2.2 when your room is too bright. Calibration is where you tell madVR what your display is calibrated to and color and gamma is where you can change the output to achieve a different gamma from what your display is calibrated too. If you set this display is already calibrated to pure power 2.2 and then set color and gamma to pure power 2.2 the color and gamma setting doesn't do anything, but if you set color and gamma to pure power 2.4 madVR will darken mid range values to achieve a 2.4 gamma on a display calibrated to 2.2.
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26th December 2016, 23:39 | #41749 | Link | |
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26th December 2016, 23:45 | #41750 | Link | |
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That means when you send the display a 10-bit signal it won't display it by dithering on an 8-bit panel. Example: a pixel value is 513 in 10-bit (edit: 128.25 in 8-bit) so a fake dithering 10-bit panel sets the pixel to 128 (8-bit) 75% of the time and 129 25% of the time.
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madVR options explained Last edited by Asmodian; 26th December 2016 at 23:50. |
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26th December 2016, 23:53 | #41751 | Link | |
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27th December 2016, 00:00 | #41752 | Link |
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Haha, people keep asking if dithering should be disabled even after we repeatedly tell them there is never a reason to disable dithering. Apparently we need to be quite firm.
But I know, it is just a question, and please keep asking them!
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27th December 2016, 00:04 | #41753 | Link | |
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Jaja I did know. But you can not deny that the information I read from LG raised the question.
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27th December 2016, 00:12 | #41754 | Link |
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Could some of you guys please stop quoting entire posts when replying? It's easy to just cut the bits you need. Half the damn feed is quoted stuff nobody is reading. There's more quote in the post than reply half the time.
Last edited by ryrynz; 27th December 2016 at 00:14. |
27th December 2016, 00:38 | #41755 | Link |
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I do try to do that but I am on mobile now and am being a bit lazy.
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27th December 2016, 03:06 | #41756 | Link |
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I know that this topic does not belong to this forum, but I ask the same. Does anyone have the color scale (Or whatever their name is) to calibrate the tv to bt.2020? Or some page from where to download it?
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27th December 2016, 05:59 | #41758 | Link | |
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After owning several meters and comparing to test pattern calibration methods I have come to the conclusion that a spectrometer is necessary to actually get a decent calibration. This is especially true with novel or new display technologies. Colorimeters don't work very well with every display having different LED backlights, even OLEDs aren't identical model to model. Test patterns are basically useless, or worse, in my experience, unless the display is completely wrong. Test patterns can only optimize one aspect at a time so you end up making three things worse to improve one aspect a bit. Your TV is close to the DCI-P3 primaries, so if you want to look for a test pattern for that you might be able to do something good but you could also make it worse then the default factory calibration.
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27th December 2016, 06:25 | #41759 | Link | |
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Test pattern I use I expressed wrong. I use the test pattern to see if it is calibrated correctly. A colorimetro or spectrometer is very difficult to obtain in my country, and to buy it would cost a fortune! So, basically you recommend use factory precalibration and just change gamma 2.4 on tv and bt.2020/pure curve 2.4 in madvr configuration? Asmodian: Today you have answered all my questions They're going to think you work for me or something. Je thks!
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27th December 2016, 08:00 | #41760 | Link | |
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Glad to help, and I hope it helps others as well. Edit: wait, don't set madVR to BT.2020 gamut, you only have 90% of DCI-P3, set DCI-P3 for gamut (or BT.709 with the TV set to standard gamut). 70% of a color space is not enough to consider it supported, even 90% isn't ideal.
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madVR options explained Last edited by Asmodian; 27th December 2016 at 08:09. |
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direct compute, dithering, error diffusion, madvr, ngu, nnedi3, quality, renderer, scaling, uhd upscaling, upsampling |
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