Converts float values to an unsigned short BufferedImage. - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Convert

  1. HOME
  2. Java
  3. 2D Graphics
  4. BufferedImage Convert

Description

Converts float values to an unsigned short BufferedImage.

Demo Code

/*//from   ww w.  j a  v  a 2 s  .c o  m
 * Image conversion utilities.
 * 
 * Copyright (c) 2006 Jean-Sebastien Senecal (js@drone.ws)
 * 
 * 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., 675 Mass
 * Ave, Cambridge, MA 02139, USA.
 */
//package com.java2s;

import java.awt.image.BufferedImage;

import java.awt.image.DataBufferUShort;

import java.nio.FloatBuffer;

public class Main {
    /**
     * Converts float values to an unsigned short <code>BufferedImage</code>.
     * 
     * @param floatBuffer contains float values. The size of the buffer must be at
     *    least as big as the size of the image.
     * @param bi <code>BufferedImage</code> with type TYPE_USHORT_GRAY. 
     * @param widthStep number of float values per row in 
     *    <code>floatBuffer</code>.
     * @return
     */
    public static BufferedImage floatBuffer2UShortGrayBufferedImage(
            FloatBuffer floatBuffer, BufferedImage bi, int widthStep) {
        final int MAX = 65535;
        float min = Float.MAX_VALUE;
        float max = Float.MIN_VALUE;
        int width = bi.getWidth();
        int height = bi.getHeight();
        for (int h = 0; h < height; h++)
            for (int w = 0; w < width; w++) {
                float value = floatBuffer.get(h * widthStep + w);
                min = Math.min(min, value);
                max = Math.max(max, value);
            }
        short[] array = ((DataBufferUShort) bi.getRaster().getDataBuffer())
                .getData();

        float range = max - min;
        if (range == 0)
            range = 1;
        for (int h = 0; h < height; h++)
            for (int w = 0; w < width; w++) {
                float value = floatBuffer.get(h * widthStep + w);
                int converted = Math.round(((value - min) * MAX / range));
                array[h * width + w] = (short) converted;
            }
        return bi;
    }
}

Related Tutorials