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.TH "al_color_rgb_to_cmyk" "3" "" "Allegro reference manual" ""
.SH NAME
al_color_rgb_to_cmyk \- Allegro 5 API
.SH SYNOPSIS
.IP
.EX
#include \f[B]<allegro5/allegro_color.h>\f[R]

void al_color_rgb_to_cmyk(float red, float green, float blue,
   float *cyan, float *magenta, float *yellow, float *key)
.EE
.SH DESCRIPTION
Each RGB color can be represented in CMYK with a K component of 0 with
the following formula:
.IP
.EX
C = 1 \- R
M = 1 \- G
Y = 1 \- B
K = 0
.EE
.PP
This function will instead find the representation with the maximal
value for K and minimal color components.
.SH SEE ALSO
al_color_cmyk(3), al_color_cmyk_to_rgb(3)