[Tig] When to use 444RGB or 444YUV for Dual link monitoring in a DI
ahauser at bigair.com.au
Sun Aug 5 00:08:58 BST 2007
How much 'color' would you say is lost?
Could this be defined as a loss of saturation as well.
Some of my tests using the RGB Linear output method
have given me a print with excelent reproduction of levels
but over saturated to the tune of about 20%!.
----- Original Message -----
From: "Bob Friesenhahn" <bfriesen at simple.dallas.tx.us>
To: "adrian hauser" <ahauser at bigair.com.au>
Cc: "tig tig" <tig at colorist.org>
Sent: Sunday, August 05, 2007 9:00 AM
Subject: Re: [Tig] When to use 444RGB or 444YUV for Dual link monitoring in
> On Sun, 5 Aug 2007, adrian hauser wrote:
>> So given the above variables when does one select 444YUV
>> or 444RGB for dual link monitoring. Aslo when working in
>> YUV I have the options to work in full range 0 - 1023 or
>> 'video range' 64 - 940.
> When transforming from original RGB to YUV, there will always be a loss of
> color since YUV supports a more limited number of colors. This is likely
> an important consideration for when you want to produce log output.
> For video, Rec.709 defines the transform to and from YCbCr ("YUV") and
> RGB. It is primarily a YCbCr format which uses "video" levels. For
> Rec.709 video output you will surely want to monitor results in YCbCr
> space with video range so that you will see the final colors.
> As a golden rule, your viewing environment should match the target
> environment as closely as possible in order to assure expected results.
> Note that if you are sure that your viewing environment matches the final
> translation to the target device environment, there may be an advantage to
> working in the original colorspace (while monitoring in the target
> colorspace) since then you will throw as little away as possible and it
> will be easier to retarget your work to some other space.
> The term "Full Range" RGB is not very meaningful except to imply that the
> data is not using "video" levels.
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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