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/*
* Gray3Bands2Rgb.java
* Takes 3 gray images and combines them to make an RGB image.
* This is not a pipeline stage.
*
* Created on August 27, 2006, 9:02 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*
* Copyright 2007 by Jon A. Webb
* This program 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 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program. If not, see .
*
*/
package com.github.ojil.algorithm;
import com.github.ojil.core.Error;
import com.github.ojil.core.Gray8Image;
import com.github.ojil.core.RgbImage;
/** Gray3Bands2Rgb converts three 8-bit gray images to RGB by copying the
* three input gray values into R, G, and B. The signed byte values in the gray
* image are changed into unsigned byte values in the ARGB word.
*
* @author webb
*/
public class Gray3Bands2Rgb {
/**
* Converts 3 8-bit gray images into an RGB image by combining the
* R, G, and B values. Also changes the data range of the bytes
* from -128->127 to 0->255 since the bit shift in Java would treat them
* as signed values otherwise.
* @param imRed the input red image.
* @param imGreen the input green image.
* @param imBlue the input blue image.
* @return the color image
* @throws com.github.ojil.core.Error if the input sizes do not match
*/
static public RgbImage push(
Gray8Image imRed,
Gray8Image imGreen,
Gray8Image imBlue) throws com.github.ojil.core.Error {
if (imRed.getWidth() != imGreen.getWidth() ||
imGreen.getWidth() != imBlue.getWidth() ||
imRed.getHeight() != imGreen.getHeight() ||
imGreen.getHeight() != imBlue.getHeight()) {
throw new Error(
Error.PACKAGE.ALGORITHM,
ErrorCodes.IMAGE_SIZES_DIFFER,
imRed.toString(),
imGreen.toString(),
imBlue.toString());
}
RgbImage rgb = new RgbImage(imRed.getWidth(), imRed.getHeight());
Byte[] redData = imRed.getData();
Byte[] greenData = imGreen.getData();
Byte[] blueData = imBlue.getData();
Integer[] rgbData = rgb.getData();
for (int i=0; i
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