Re: [Gimp-user] Histogramm -- values

[Wolfgang Hugemann <Auto Hugemann de>]

Am 13.11.2013 22:16, schrieb scl:
> I'm for using the words value, tonal value, brightness, lightness etc.
> consistently to avoid further confusion.
> What are the 'officially defined' or 'most commonly used' names and
> meanings in these contexts for you, the users?

Do you think it is the right approach to ask the users? I would rather 
suggest asking someone who has a thorough understanding of colour spaces 
and alike. I could ask Fred Weinhaus (www.fmwconcepts.com/imagemagick) 
to give that a look, as he has a deep understanding of the matter.

Another approach would be to have a look on what these things are called 
in Photoshop, if you dare ;-). Normally, I would also suggest to have a 
look at ImageMagick's nomenclature, but this is also rather questionary 
in some regards ...

In regard to the HSV colour space, you probably have no other option 
than calling the V component "value", as this is its name, whether it 
makes sense or not.

In regard to the histogram of a colour image, I would regard the y-axis 
as the equivalent grey-value of the colour, i.e. its brightness, 
lightness or luminance, whatever you would like to call that.

I think the word unspecific "value" should be avoided as far as possible.

Wolfgang Hugemann