GrayRange¶

Type:	Vector<float>
Range:	[v_1, …, v_2]
Default:	-/-
Appearance:	simple
Excludes:	ColorRange

Gray color range $[g_\mathrm{min}\, g_\mathrm{max}$ . A gray value $g$ is normalized so that $0.0\leq g \leq 1.0$ (black is $0$ , white is $1$ ).

A pixel with gray value $g$ is selected if $g_\mathrm{min} \leq g \leq g_\mathrm{max}$ . In case of color bitmap value the gray value is computed from the $rgb$ color data as follows:

$\begin{eqnarray*} g = 0.2989 \cdot r +0.5870 \cdot g+0.1140 \cdot b \end{eqnarray*}$