Java使用BufferedImage转换图像的灰度和棕褐色版本
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内容图文
我想读取图像并转换并输出原始图像,灰度版本和棕褐色版本.我在转换时遇到问题,对BufferedImage不太熟悉,特别是遇到getRGB和setRGB方法的问题.到目前为止我有这个
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import javax.imageio.stream.ImageOutputStream;
public class ChangeColor{
static BufferedImage readImage( String Pic ) throws Exception {
BufferedImage image = ImageIO.read( new File("Pic.jpg") );
return( image );
}
public static void saveImage( BufferedImage img, File file ) throws IOException {
ImageWriter writer = null;
java.util.Iterator iter = ImageIO.getImageWritersByFormatName("jpg");
if( iter.hasNext() ){
writer = (ImageWriter)iter.next();
}
ImageOutputStream ios = ImageIO.createImageOutputStream( file );
writer.setOutput(ios);
ImageWriteParam param = new JPEGImageWriteParam( java.util.Locale.getDefault() );
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) ;
param.setCompressionQuality(0.98f);
writer.write(null, new IIOImage( img, null, null ), param);
}
public static BufferedImage color2gray( BufferedImage inImage ) {
int width = inImage.getWidth();
int height = inImage.getHeight();
BufferedImage outImage = new BufferedImage( width, height, BufferedImage.TYPE_3BYTE_BGR );
for(int i=0; i<height; i++){
for(int j=0; j<width; j++){
Color c = new Color(image.getRGB(j, i));
int red = (int)(c.getRed() * 0.2126);
int green = (int)(c.getGreen() * 0.7152);
int blue = (int)(c.getBlue() *0.0722);
Color newColor = new Color(red+green+blue,
red+green+blue,red+green+blue);
image.setRGB(j,i,newColor.getRGB());
}
}
return( outImage );
}
public static BufferedImage color2sepia( BufferedImage inImage ) {
int width = inImage.getWidth();
int height = inImage.getHeight();
BufferedImage outImage = new BufferedImage( width, height, BufferedImage.TYPE_3BYTE_BGR );
for(int i=0; i<height; i++){
for(int j=0; j<width; j++){
Color c = new Color(image.getRGB(j, i));
int red = (int)(c.getRed());
int green = (int)(c.getGreen());
int blue = (int)(c.getBlue());
Color newColor = new Color(red* .393)+(green*.769)+(blue* .189),
(red* .349)+(green*.686)+(blue* .168),(red* .272)+(green*.534)+(blue* .131);
image.setRGB(j,i,newColor.getRGB());
}
}
return( outImage );
}
public static void main(String[] args) throws Exception {
BufferedImage colorImage, grayImage, sepiaImage;
if (args.length != 1)
System.out.println( "" );
else
{
colorImage = readImage ( args[0] );
grayImage = color2gray ( colorImage );
sepiaImage = color2sepia( colorImage );
saveImage( grayImage, new File( "greyPic.jpg" + args[0] ) );
saveImage( sepiaImage, new File( "sepiaPic.jpg"+ args[0] ) );
}
}
}
这是输出应该是什么样子的图像：
谢谢.
解决方法:
灰度比较容易,棕褐色不是那么多.我从网上偷了算法……
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ColorAlteration {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
try {
BufferedImage master = ImageIO.read(new File("C:\\hold\\thumbnails\\_cg_836___Tilting_Windmills___by_Serena_Clearwater.png"));
BufferedImage gray = toGrayScale(master);
BufferedImage sepia = toSepia(master, 80);
JPanel panel = new JPanel(new GridBagLayout());
panel.add(new JLabel(new ImageIcon(master)));
panel.add(new JLabel(new ImageIcon(gray)));
panel.add(new JLabel(new ImageIcon(sepia)));
JOptionPane.showMessageDialog(null, panel);
} catch (IOException ex) {
ex.printStackTrace();
}
}
});
}
public static BufferedImage toGrayScale(BufferedImage master) {
BufferedImage gray = new BufferedImage(master.getWidth(), master.getHeight(), BufferedImage.TYPE_INT_ARGB);
// Automatic converstion....
ColorConvertOp op = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
op.filter(master, gray);
return gray;
}
public static BufferedImage toSepia(BufferedImage img, int sepiaIntensity) {
BufferedImage sepia = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_RGB);
// Play around with this. 20 works well and was recommended
// by another developer. 0 produces black/white image
int sepiaDepth = 20;
int w = img.getWidth();
int h = img.getHeight();
WritableRaster raster = sepia.getRaster();
// We need 3 integers (for R,G,B color values) per pixel.
int[] pixels = new int[w * h * 3];
img.getRaster().getPixels(0, 0, w, h, pixels);
// Process 3 ints at a time for each pixel. Each pixel has 3 RGB
// colors in array
for (int i = 0; i < pixels.length; i += 3) {
int r = pixels[i];
int g = pixels[i + 1];
int b = pixels[i + 2];
int gry = (r + g + b) / 3;
r = g = b = gry;
r = r + (sepiaDepth * 2);
g = g + sepiaDepth;
if (r > 255) {
r = 255;
}
if (g > 255) {
g = 255;
}
if (b > 255) {
b = 255;
}
// Darken blue color to increase sepia effect
b -= sepiaIntensity;
// normalize if out of bounds
if (b < 0) {
b = 0;
}
if (b > 255) {
b = 255;
}
pixels[i] = r;
pixels[i + 1] = g;
pixels[i + 2] = b;
}
raster.setPixels(0, 0, w, h, pixels);
return sepia;
}
}
您可以找到sepia算法here的原始发布
而且因为我很顽固……我改变了sepia算法来处理基于alpha的图像……
public static BufferedImage toSepia(BufferedImage img, int sepiaIntensity) {
BufferedImage sepia = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_INT_ARGB);
// Play around with this. 20 works well and was recommended
// by another developer. 0 produces black/white image
int sepiaDepth = 20;
int w = img.getWidth();
int h = img.getHeight();
WritableRaster raster = sepia.getRaster();
// We need 3 integers (for R,G,B color values) per pixel.
int[] pixels = new int[w * h * 3];
img.getRaster().getPixels(0, 0, w, h, pixels);
for (int x = 0; x < img.getWidth(); x++) {
for (int y = 0; y < img.getHeight(); y++) {
int rgb = img.getRGB(x, y);
Color color = new Color(rgb, true);
int r = color.getRed();
int g = color.getGreen();
int b = color.getBlue();
int gry = (r + g + b) / 3;
r = g = b = gry;
r = r + (sepiaDepth * 2);
g = g + sepiaDepth;
if (r > 255) {
r = 255;
}
if (g > 255) {
g = 255;
}
if (b > 255) {
b = 255;
}
// Darken blue color to increase sepia effect
b -= sepiaIntensity;
// normalize if out of bounds
if (b < 0) {
b = 0;
}
if (b > 255) {
b = 255;
}
color = new Color(r, g, b, color.getAlpha());
sepia.setRGB(x, y, color.getRGB());
}
}
return sepia;
}
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