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Grayscale/Color Calibration

 
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Manuel2063



Joined: 16 Jan 2016
Posts: 1



PostLink    Posted: Thu Jun 30, 2016 2:57 pm    Post subject: Grayscale/Color Calibration Reply with quote


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Hello.

I've been trying to improve my calibration experience and need some help. I am using chromapure ver 3.x and wanted to get some clarification/help


1. on a 10 pt grayscale i find some TV's say all the settings are active at once and changing the main 80/20 actually changes more on the 30 and less on 20; is this common and i am taking the 80/20 too literal? , also when i get to the 10 pt changing 2 for 20 for example has for of a change on 30%, 3 changes 40% and so on am i crazy?

2. when calibration for grayscale this seems to change color, so if i reduce blue to even out the colors on the color decoder blue now has -8 + %, should i be going back and forth to make sure the color are even on white balance/color all the time? The guide suggest that I do not modify green so when is it a good idea?

I apologize if this has been answered elsewhere but I could not find any information.

Thanks.
Manny

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kal
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Joined: 06 Mar 2006
Posts: 15358
Location: Ottawa, Canada

TV/Projector: JVC DLA-RS56


PostLink    Posted: Thu Jun 30, 2016 6:28 pm    Post subject: Re: Grayscale/Color Calibration Reply with quote

Manuel2063 wrote:
1. on a 10 pt grayscale i find some TV's say all the settings are active at once and changing the main 80/20 actually changes more on the 30 and less on 20; is this common and i am taking the 80/20 too literal?

Regardless of whether your TV has a 10 pt greyscale instead of just a two point (usually around 80/20 or 30/70), making adjustments to any of the points affects all points. Think of the points as positions on a string tied between two posts. While pulling up or down at any given point affects that point the most it also affects the entire string. That's what you are seeing.

Quote:
, also when i get to the 10 pt changing 2 for 20 for example has for of a change on 30%, 3 changes 40% and so on am i crazy?

I don't understand what you're saying. Can you clarify as to exactly what you're adjusting where?

Quote:
2. when calibration for grayscale this seems to change color, so if i reduce blue to even out the colors on the color decoder blue now has -8 + %, should i be going back and forth to make sure the color are even on white balance/color all the time?

Any adjustment affects everything else so always loop back and re-check. Once you can get through from start to end without adjusting anything, you're done.

Quote:
The guide suggest that I do not modify green so when is it a good idea?

I don't really understand what you're asking here either. Green is usually the reference so no need to adjust. There are times that, yes, you may need to adjust green if you want to bump light output up or down and can't get things flat. There are no hard or fast rules.

Kal

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