On 12/13/2011 06:37 PM, Mojca Miklavec wrote:
> On Tue, Dec 13, 2011 at 23:32, Ethan A Merritt wrote:
>> On Tuesday, December 13, 2011 02:19:58 pm Mojca Miklavec wrote:
>>> 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.
What object is it exactly that the monochrome qualifier refers to?
Lines, images, symbols? All of the above?
Monochrome means as you say, a single color or point on the chromatic
scale. However, I'd say that greyscale is a special type of monochrome.
The thing that varies in monochrome is the intensity of the light
source (i.e., pixel) while the color components remain fixed, relatively
speaking. Greyscale is a monochrome in which all primary components are
weighted equally. However, one could create a monochrome image where
the color components (RGB) are not weighted equally. Examples of this
would be well known historic photographic prints that, for example, have
a sepia tone.
So with the "monochrome" option, I'd suggest a second qualifier option
which is the RGB components. (We must have a standard way of expressing
RGB by now. Names might work too.) For example,
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
> 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.)
Color palette is different from monochrome and different from RGB.
Palette is a series of colors acting as a look-up-table for various
values. Give the LUT a value of 3 and it returns a triple representing
the RGB values. The palette can be asigned vary strange color
combinations to create various effects, e.g., weather map, cartography,