[foolrush]

Linear is not a colourspace.

It is an attribute of a properly defined encoding model. Further, there are two forms of linear display linear and scene linear, which are fundamentally essential to grasp for rendering approaches.

See ISO 22028-1:2004 for a discussion of terms.

[nightcracker]

> Linear is not a colourspace.

I never said so. I said it gives >> a << linear colorspace. There are many such color spaces. Some are linear in different aspects (better at close or far away colors), and some only preserve some aspects (linear in brightness, or chroma, etc). I didn't intend to fully go into color theory.

I'm not even certain how well defined the color space is, and how properly linear it is. I do know that it accounts for gamma correction though (at least on my machine).

[foolrush]

No.

Linear is not a colour space, as a properly defined colour space, as per the ISO specification, is:

- A well defined transfer function.

- Properly described primary light chromaticities.

- Properly defined white point colour.

Where you reference "there are many such color spaces" is the issue. Linear specifically relates to the first point, and even that doesn't properly describe whether one is speaking of display linear or scene linear.

The other points relate to perceptually uniform discussions, which would be a misuse of the term linear.

I agree that it is not a suitable forum for color theory. “Linear” however, is a much confused subject, worthy of explanation.