Brown¶

Status: Experimental

present and registered, but lightly documented and not yet covered by dedicated tests.

Description¶

Brown

The named colour RGBColor[0.6, 0.4, 0.2].

Examples (3)¶

Every input below was run against the current Mathilda build and its output recorded.

Applications (3)¶

A tertiary tone -- components are reals, not 0/1

In[1]:= Brown
Out[1]= RGBColor[0.6, 0.4, 0.2]

An OwnValue, not an inert head -- already resolved

In[2]:= FullForm[Brown]
Out[2]= RGBColor[0.6, 0.4, 0.2]

Usable wherever a directive is expected

In[3]:= Head[Graphics[{Brown, Disk[]}]]
Out[3]= Graphics

Implementation notes¶

Definition. Brown is one of Mathilda's named colour constants, bound as an OwnValue: register_color("Brown", rgb_color(0.6, 0.4, 0.2)) in graphics_init (src/graphics/graphics_init.c) makes the bare symbol Brown evaluate to the literal RGBColor[0.6, 0.4, 0.2] and marks it Protected. The docstring is kept centrally in src/info.c.

Representation. Brown evaluates to RGBColor[0.6, 0.4, 0.2], so FullForm[Brown] is RGBColor[0.6, 0.4, 0.2] and Head[Brown] is RGBColor. Its components are not 0 or 1, so color_component renders each as a machine real — unlike the pure primaries, whose components print as integers. Brown is one of the fuller tertiary tones (with Orange, Pink, Purple).

Usage & limits. As a resolved colour literal it is accepted anywhere a directive is — Graphics[{Brown, Disk[]}], PlotStyle -> Brown, Directive[Brown, Thick]. Plot evaluates its option values once before storing them, so Epilog -> Brown also sees the resolved literal. The light companion LightBrown (RGBColor[0.94, 0.91, 0.88]) is a separate constant, not a programmatic lightening of Brown. It carries no opacity; use Opacity[a] or the four-argument RGBColor for translucency.

Attributes: Protected.

References¶

Source: src/graphics/graphics_init.c
Specification index: Mathilda_spec.md

Notes & additional examples¶

Notes¶

Brown is the named colour RGBColor[0.6, 0.4, 0.2]. It is bound as a Protected OwnValue, so it resolves to a real colour literal wherever a bare argument is evaluated: FullForm[Brown] is RGBColor[0.6, 0.4, 0.2] and Head[Brown] is RGBColor.

Its components are machine reals (none is exactly 0 or 1), so they print as reals, unlike the pure primaries. The light companion LightBrown (RGBColor[0.94, 0.91, 0.88]) is a separate constant, not a programmatic lightening of Brown. Brown carries no opacity; use Opacity[a] or the four-argument RGBColor[r, g, b, a].