/*
* Copyright (C) 2008-2015 by Holger Arndt
*
* This file is part of the Universal Java Matrix Package (UJMP).
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* UJMP is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* UJMP 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with UJMP; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package org.ujmp.core.doublematrix.calculation.entrywise.misc;
import org.ujmp.core.Matrix;
import org.ujmp.core.doublematrix.calculation.AbstractDoubleCalculation;
public class GrayScale extends AbstractDoubleCalculation {
private static final long serialVersionUID = -4082255477140195806L;
public enum ColorChannel {
Red, Green, Blue
}
private final ColorChannel colorChannel;;
public GrayScale(Matrix matrix, ColorChannel colorChannel) {
super(matrix);
this.colorChannel = colorChannel;
}
public double getDouble(long... coordinates) {
final int value = getSource().getAsInt(coordinates);
switch (colorChannel) {
case Red:
return ((value >> 16) & 0xFF) / 255.0;
case Green:
return ((value >> 8) & 0xFF) / 255.0;
default:
return (value & 0xFF) / 255.0;
}
}
}