com.twelvemonkeys.imageio.plugins.hdr.tonemap.DefaultToneMapper Maven / Gradle / Ivy

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ImageIO plugin for Radiance RGBE High Dynaimc Range format (HDR).

There is a newer version: 3.12.0

/*
 * Copyright (c) 2015, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.imageio.plugins.hdr.tonemap;

/**
 * DefaultToneMapper.
 * 
 * Normalizes values to range [0...1] using:
 * 
 * 
 *     V_out =  V_in / (V_in + C)
 * 
 * 
 * Where C is constant.
 * 
 *
 * @author Harald Kuhr
 * @author last modified by $Author: harald.kuhr$
 * @version $Id: DefaultToneMapper.java,v 1.0 28/07/15 harald.kuhr Exp$
 */
public final class DefaultToneMapper implements ToneMapper {

    private final float constant;

    public DefaultToneMapper() {
        this(1);
    }

    public DefaultToneMapper(final float constant) {
        this.constant = constant;
    }

    @Override
    public void map(final float[] rgb) {
        // Default Vo =  Vi / (Vi + 1)
        for (int i = 0; i < rgb.length; i++) {
            rgb[i] = rgb[i] / (rgb[i] + constant);
        }
    }
}