Re: what should monochrome option do exactly?

[Tait <gnu...@t4...>]

> set term foo monochrome (1,0.8,0.5)
> set term foo monochrome red
>    [above is equivalent to "set term foo monochrome (1,0,0)"]
> set term foo monochrome sepia
>
> Thoughts?

My first thoughts are, "is that useful?" "is it necessary?"

But if we do go that route, I see no reason to limit the possibilities
to a linear arithmetic weighted average. If one wants a nonlinear
dependence on one or more of the color channels, the more general
solution would be something like "set term foo monochrom using
((2.0*$1**2+$2+$3)/(2*255**2+2*255))" or replace 255 with 1.0 if we're
using a 0-1.0 scale instead of 0-255. I am assuming $1, $2, $3 are red,
green, blue respectively.