Built-in Mathematica Symbol

GrayLevel

GrayLevel[level]
is a graphics directive which specifies the gray-level intensity with which objects that follow should be displayed.

GrayLevel[g, a]
specifies opacity a.

MORE INFORMATION

The gray level must be a number between 0 and 1. »

0 represents black; 1 represents white.

On display devices with no native gray-level capability, dither patterns are typically used.

For 3D surfaces, explicit GrayLevel directives define surface colors; the final shading depends on lighting.

In GrayLevel[g, a], a is an "alpha channel" used to specify opacity.

GrayLevel[g, a] is equivalent to {GrayLevel[g], Opacity[a]}. »

If no opacity has been specified, GrayLevel[g] is equivalent to GrayLevel[g, 1].

Style[expr, GrayLevel[...]] specifies that expr should be displayed with the specified gray level. »

EXAMPLES

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Basic Examples (4)

Specify the gray level of graphics primitives:

Specify the gray level with opacity:

Specify the output gray level of expressions:

Specify the gray level of plots:

Specify the gray level of graphics primitives:

In[1]:=

Out[1]=

Specify the gray level with opacity:

In[1]:=

Out[1]=

Specify the output gray level of expressions:

In[1]:=

Out[1]=

Specify the gray level of plots:

In[1]:=

Out[1]=

Scope (1)

Use diffuse surface color:

Use diffuse and specular surface color:

Use glow color, setting the diffuse surface color to black:

Generalizations & Extensions (1)

Use Opacity with GrayLevel:

Use the opacity argument directly in GrayLevel:

Properties & Relations (1)

GrayLevel of RGBColor can be computed in the following way:

From this formula we see that many colors will produce the same gray level G:

Use a color function in the RGB color space:

The corresponding gray-level colors:

Possible Issues (2)

Gray-level values outside of the 0, 1 range will be clipped:

The actual surface color depends on the colors of lights in 3D:

The default 3D lights contain several colored light sources:

Neat Examples (2)

Visualizing the gray level with opacity:

White noise with opacity: