rgb2cmyk

#!/bin/bash

####COPYRIGHT NOTICE#####COPYRIGHT NOTICE#####COPYRIGHT NOTICE#####COPYRIGHT NOTICE#####COPYRIGHT NOTICE#####COPYRIGHT NOTICE####
#Copyright (C) 2018 exarobibliologst (github.com/exarobibliologist)                                                             #
#                                                                                                                               #
#This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License      #
#as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.          #
#                                                                                                                               #
#This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of #
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.                     #
#                                                                                                                               #
#You should have received a copy of the GNU General Public License along with this program; if not, write to the                #
#Free Software Foundation, Inc.                                                                                                 #
#51 Franklin Street, Fifth Floor,                                                                                               #
#Boston, MA  02110-1301, USA.                                                                                                   #
#################################################################################################################################

function rgb2cmyk()
{
echo "Input Red 0-255"
read red
echo "Input Green 0-255"
read green
echo "Input Blue 0-255"
read blue
computedC=$(echo "1-($red/255)" | bc)
computedM=$(echo "1-($green/255)" | bc)
computedY=$(echo "1-($blue/255)" | bc)
array="${computedC}\n${computedM}\n${computedY}"
minCMY=$(echo -e "${array}" | sort -n | head -n1)
theC=$(echo "($computedC - $minCMY) / (1 - $minCMY)" | bc)
theM=$(echo "($computedM - $minCMY) / (1 - $minCMY)" | bc)
theY=$(echo "($computedY - $minCMY) / (1 - $minCMY)" | bc)
clear
echo -e "The RGB color $red / $green / $blue\nis\nC=$theC\nM=$theM\nY=$theY\nK=$minCMY"
}