Re: what should monochrome option do exactly?

[Mojca M. <moj...@gm...>]

On Tue, Dec 13, 2011 at 23:32, Ethan A Merritt wrote:
> On Tuesday, December 13, 2011 02:19:58 pm Mojca Miklavec wrote:
>> Hello,
>>
>> I just remembered that implementation of monochrome option in context
>> terminal is slightly suboptimal (in standalone mode it lets TeX do
>> color conversion into gray scale as "rgb2gray").
>>
>> I should probably fix that, but I'm not sure what exactly to do:
>> should I simply make all the colors black or should I use different
>> shades of gray, and in the second case - which colors exactly?
>
> In my opinion, which may not be universally shared,
> 'set term foo monochrome' should cause it to choose a default palette
> in shades of grey, and a default set of lines that are not colored.

On the other hand, mochrome means "mono" (= single color).
I understand the second. The colors lc 1, lc 2, ... should be gray,
except that I would be grateful for some proposal of which shades of
gray exactly.

But what exactly is meant with default palette? PM3D? But how can a
terminal influence the choice of palette formulas?

> But it should not prevent the user from drawing explicitly in whatever
> color they like, and it should not prevent the user from selecting a
> color palette later.

What exactly do you mean with selecting a color palette? (Probably the
same question as earlier.)

> I see it as exactly analagous to "set term foo dashed", which
> defaults to dashed lines but does not stop you from explictly
> drawing with solid lines instead

Yes, but solid line is one particular type of dashed line (one can
always draw with "lt 0 lc 3"), while the opposite is not true. If one
selects "solid", it is impossible to draw dashed lines later.

In the same way, if one chooses "color", one can always plot with "lc
0" (black) or with proper black since black is just one type of color.
(If analogy with dashes was true, one would not be able to draw in
color once monochrome is selected. On the other hand there exists a
mechanism to set colors explicitly as rgb values, but no mechanism to
set an explicit dash type [unless I'm mistaken].)

Mojca