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Open Java Imaging Library.
/*
* Gray82Gray32.java
*
* 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.Gray32Image;
import com.github.ojil.core.Gray8Image;
import com.github.ojil.core.Image;
import com.github.ojil.core.ImageError;
import com.github.ojil.core.PipelineStage;
/**
* Gray82Gray32 converts an 32-bit gray image to a 8-bit gray image. Input
* values are clamped between Byte.MIN_VALUE and Byte.MAX_VALUE.
*
* @author webb
*/
public class Gray32Gray8 extends PipelineStage {
/** Creates a new instance of Gray82Gray32 */
public Gray32Gray8() {
}
/**
* Converts a 32-bit gray image into an 8-bit gray image.
*
*
* @param image
* the input image.
* @throws com.github.ojil.core.ImageError
* if the input is not a Gray8Image
*/
@Override
public void push(final Image> image) throws ImageError {
if (!(image instanceof Gray32Image)) {
throw new ImageError(ImageError.PACKAGE.ALGORITHM, AlgorithmErrorCodes.IMAGE_NOT_GRAY32IMAGE, image.toString(), null, null);
}
final Gray32Image> gray32 = (Gray32Image>) image;
final Gray8Image> gray8 = new Gray8Image<>(image.getWidth(), image.getHeight());
final Integer[] gray32Data = gray32.getData();
final Byte[] gray8Data = gray8.getData();
for (int i = 0; i < (gray32.getWidth() * gray32.getHeight()); i++) {
/*
* Convert from 32-bit value to 8-bit value.
*/
/* Assign 8-bit output */
gray8Data[i] = (byte) Math.min(Byte.MAX_VALUE, Math.max(Byte.MIN_VALUE, gray32Data[i]));
}
super.setOutput(gray8);
}
}
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