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.TH "al_color_lch" "3" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_color_lch - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro_color.h>

ALLEGRO_COLOR al_color_lch(float l, float c, float h)
\f[R]
.fi
.SH DESCRIPTION
.PP
Return an ALLEGRO_COLOR(3) structure from CIE LCH values.
LCH colors are very similar to HSL, with the same meaning of L and H and
C corresponding to S.
However LCH is more visually uniform.
Furthermore, this function expects the angle for H in radians and not in
degree.
.PP
The CIE LCH color space is a cylindrical representation of the L*a*b*
color space.
The L component is the same and C and H are computed like this:
.IP
.nf
\f[C]
C = sqrt(a * a + b * b)
H = atan2(b, a)
\f[R]
.fi
.SH SINCE
.PP
5.2.3
.SH SEE ALSO
.PP
al_color_lch_to_rgb(3), al_color_rgb_to_lch(3)