JAVA图片处理--缩放，切割，类型转换

import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.Graphics;
import java.awt.color.ColorSpace;
import javax.imageio.ImageIO;public class ChangeImageSize
{/** *//*** 缩放图像* @param srcImageFile 源图像文件地址* @param result       缩放后的图像地址* @param scale        缩放比例* @param flag         缩放选择:true 放大; false 缩小;*/public static void scale(String srcImageFile, String result, int scale, boolean flag){try{BufferedImage src = ImageIO.read(new File(srcImageFile)); // 读入文件int width = src.getWidth(); // 得到源图宽int height = src.getHeight(); // 得到源图长if (flag){// 放大width = width * scale;height = height * scale;}else{// 缩小width = width / scale;height = height / scale;}Image image = src.getScaledInstance(width, height, Image.SCALE_DEFAULT);BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();ImageIO.write(tag, "JPEG", new File(result));// 输出到文件流
        }catch (IOException e){e.printStackTrace();}}/** *//*** 图像切割* @param srcImageFile 源图像地址* @param descDir      切片目标文件夹* @param destWidth    目标切片宽度* @param destHeight   目标切片高度*/public static void cut(String srcImageFile, String descDir, int destWidth, int destHeight){try{Image img;ImageFilter cropFilter;// 读取源图像BufferedImage bi = ImageIO.read(new File(srcImageFile));int srcWidth = bi.getHeight(); // 源图宽度int srcHeight = bi.getWidth(); // 源图高度if (srcWidth > destWidth && srcHeight > destHeight){Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT);destWidth = 200; // 切片宽度destHeight = 150; // 切片高度int cols = 0; // 切片横向数量int rows = 0; // 切片纵向数量// 计算切片的横向和纵向数量if (srcWidth % destWidth == 0){cols = srcWidth / destWidth;}else{cols = (int) Math.floor(srcWidth / destWidth) + 1;}if (srcHeight % destHeight == 0){rows = srcHeight / destHeight;}else{rows = (int) Math.floor(srcHeight / destHeight) + 1;}// 循环建立切片// 改进的想法:是否可用多线程加快切割速度for (int i = 0; i < rows; i++){for (int j = 0; j < cols; j++){// 四个参数分别为图像起点坐标和宽高// 即: CropImageFilter(int x,int y,int width,int height)cropFilter = new CropImageFilter(j * 200, i * 150, destWidth, destHeight);img = Toolkit.getDefaultToolkit(), .createImage(new FilteredImageSource(image.getSource(), cropFilter));BufferedImage tag = new BufferedImage(destWidth, destHeight, BufferedImage.TYPE_INT_RGB);Graphics g = tag.getGraphics();g.drawImage(img, 0, 0, null); // 绘制缩小后的图
                        g.dispose();// 输出为文件ImageIO.write(tag, "JPEG", new File(descDir + "pre_map_" + i + "_" + j + ".jpg"));}}}}catch (Exception e){e.printStackTrace();}}/** *//*** 图像类型转换 GIF->JPG GIF->PNG PNG->JPG PNG->GIF(X)*/public static void convert(String source, String result){try{File f = new File(source);f.canRead();f.canWrite();BufferedImage src = ImageIO.read(f);ImageIO.write(src, "JPG", new File(result));}catch (Exception e){// TODO Auto-generated catch block
            e.printStackTrace();}}/** *//*** 彩色转为黑白* @param source* @param result*/public static void gray(String source, String result){try{BufferedImage src = ImageIO.read(new File(source));ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);ColorConvertOp op = new ColorConvertOp(cs, null);src = op.filter(src, null);ImageIO.write(src, "JPEG", new File(result));}catch (IOException e){e.printStackTrace();}}/** *//*** @param args*/public static void main(String[] args){scale("D:\100CASIO\CIMG0001.JPG","C:\Documents and Settings\ibm\桌面\image.jpg",10,false);}}

文章转自：http://www.cnblogs.com/chinaqiao/archive/2009/06/04/1496170.html