/**
* Java Modular Image Synthesis Toolkit (JMIST)
* Copyright (C) 2008-2013 Bradley W. Kimmel
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
package ca.eandb.jmist.framework.tone;
import ca.eandb.jmist.framework.color.CIEXYZ;
import ca.eandb.jmist.framework.color.CIExyY;
import ca.eandb.jmist.framework.color.ColorUtil;
/**
* @author Brad
*
*/
public final class ReinhardToneMapper implements ToneMapper {
/** Serialization version ID. */
private static final long serialVersionUID = 260645449581170296L;
private final double yWhiteSquared;
private final double yScale;
public ReinhardToneMapper(double yScale, double yWhite) {
this.yScale = yScale;
this.yWhiteSquared = yWhite * yWhite;
}
/* (non-Javadoc)
* @see ca.eandb.jmist.framework.color.ToneMapper#apply(ca.eandb.jmist.framework.color.CIEXYZ)
*/
public CIEXYZ apply(CIEXYZ hdr) {
CIExyY xyY = CIExyY.fromXYZ(hdr);
double Y = xyY.Y() * yScale;
if (yWhiteSquared < Double.POSITIVE_INFINITY) {
Y = Y * (1.0 + Y / yWhiteSquared) / (1.0 + Y);
} else {
Y = Y / (1.0 + Y);
}
return ColorUtil.convertxyY2XYZ(xyY.x(), xyY.y(), Y);
}
}