Gray balancing???

[c***@gmail.com]

Hi all,

Thanks a lot for your answers related to my question about gray
colors.

I have another question. In the scanner or monitor characterization, a
first step is to apply 1-D LUTS or Gain-Offset-Gamma (GOG) model to
convert nonlinear RGB (either native scanner RGB or monitor RGB space)
to linear RGB (linear to the luminance).

In some papers, they call this process as "gray balancing". While I
understand the objective (why we need to convert fron nonlinear to
linear RGB before applying a linear transformation fron linear RGB to
CIE XYZ), I do not understand clearly the gray balancing objective.


Can you guys explain for me what the gray balancing is and how it is
done with the GOG model or 1-D LUTS?

Thanks

[user]

Post by c***@gmail.com
Hi all,
Thanks a lot for your answers related to my question about gray
colors.
I have another question. In the scanner or monitor characterization, a
first step is to apply 1-D LUTS or Gain-Offset-Gamma (GOG) model to
convert nonlinear RGB (either native scanner RGB or monitor RGB space)
to linear RGB (linear to the luminance).
In some papers, they call this process as "gray balancing". While I
understand the objective (why we need to convert fron nonlinear to
linear RGB before applying a linear transformation fron linear RGB to
CIE XYZ), I do not understand clearly the gray balancing objective.
Can you guys explain for me what the gray balancing is and how it is
done with the GOG model or 1-D LUTS?
Thanks

Problem with grays is ..

you only have 256 grays on your 24 bits image.

Imagine taking 64 bits for each color on your 64 bit computer....
(or at lmeats 3x16bits instead of 3x8 or more bits to fill one 64 bit
computer word).

Why is the color hardware world so conservative?? 24 bit colors I've been
using on MAc since 1989?
Nothing changed, and the weaknesses are: gray levels, blue levels, red
levels and green levels, all other colors in between are "good enough"??

I guess the hardwareworld is full of bad programmers, they can't make a 64
bit/3X64bit videocard...