JAVA 图片处理
2016-07-12 15:34
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可实现以下常用功能:缩放图像、切割图像、图像类型转换、彩色转黑白、文字水印、图片水印等
原文:http://www.cnblogs.com/liyunqi007/archive/2011/11/23/2260052.html
import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Toolkit; import java.awt.color.ColorSpace; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.awt.image.ColorConvertOp; import java.awt.image.CropImageFilter; import java.awt.image.FilteredImageSource; import java.awt.image.ImageFilter; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class ImageUtils { public static String IMAGE_TYPE_GIF = "gif";// 图形交换格式 public static String IMAGE_TYPE_JPG = "jpg";// 联合照片专家组 public static String IMAGE_TYPE_JPEG = "jpeg";// 联合照片专家组 public static String IMAGE_TYPE_BMP = "bmp";// 英文Bitmap(位图)的简写,它是Windows操作系统中的标准图像文件格式 public static String IMAGE_TYPE_PNG = "png";// 可移植网络图形 public static String IMAGE_TYPE_PSD = "psd";// Photoshop的专用格式Photoshop public static void main(String[] args) { // 1-缩放图像: // 方法一:按比例缩放 ImageUtils.scale("D:/abc.jpg", "D:/abc_scale.jpg", 2, true);//测试OK // 方法二:按高度和宽度缩放 ImageUtils.scale2("D:/abc.jpg", "D:/abc_scale2.jpg", 500, 300, true);//测试OK // 2-切割图像: // 方法一:按指定起点坐标和宽高切割 ImageUtils.cut("D:/abc.jpg", "D:/abc_cut.jpg", 0, 0, 400, 400 );//测试OK // 方法二:指定切片的行数和列数 ImageUtils.cut2("D:/abc.jpg", "D:/", 2, 2 );//测试OK // 方法三:指定切片的宽度和高度 ImageUtils.cut3("D:/abc.jpg", "D:/", 300, 300 );//测试OK // 3-图像类型转换: ImageUtils.convert("D:/abc.jpg", "GIF", "D:/abc_convert.gif");//测试OK // 4-彩色转黑白: ImageUtils.gray("D:/abc.jpg", "D:/abc_gray.jpg");//测试OK // 5-给图片添加文字水印: // 方法一: ImageUtils.pressText("我是水印文字","D:/abc.jpg","D:/abc_pressText.jpg","宋体",Font.BOLD,Color.white,80, 0, 0, 0.5f);//测试OK // 方法二: ImageUtils.pressText2("我也是水印文字", "D:/abc.jpg","D:/abc_pressText2.jpg", "黑体", 36, Color.white, 80, 0, 0, 0.5f);//测试OK // 6-给图片添加图片水印: ImageUtils.pressImage("D:/abc2.jpg", "D:/abc.jpg","D:/abc_pressImage.jpg", 0, 0, 0.5f);//测试OK } public final static void scale(String srcImageFile, String result, float 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 = Integer.valueOf(new Float(width * scale).intValue()); height = Integer.valueOf(new Float(height * scale).intValue()); } else {// 缩小 width = Integer.valueOf(new Float(width / scale).intValue()); height = Integer.valueOf(new Float(height / scale).intValue()); } 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(); } } public final static void scale2(String srcImageFile, String result, int height, int width, boolean bb) { try { double ratio = 0.0; // 缩放比例 File f = new File(srcImageFile); BufferedImage bi = ImageIO.read(f); Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH); // 计算比例 if ((bi.getHeight() > height) || (bi.getWidth() > width)) { if (bi.getHeight() > bi.getWidth()) { ratio = (new Integer(height)).doubleValue() / bi.getHeight(); } else { ratio = (new Integer(width)).doubleValue() / bi.getWidth(); } AffineTransformOp op = new AffineTransformOp(AffineTransform .getScaleInstance(ratio, ratio), null); itemp = op.filter(bi, null); } if (bb) {//补白 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setColor(Color.white); g.fillRect(0, 0, width, height); if (width == itemp.getWidth(null)) g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); else g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null); g.dispose(); itemp = image; } ImageIO.write((BufferedImage) itemp, "JPEG", new File(result)); } catch (IOException e) { e.printStackTrace(); } } public final static void cut(String srcImageFile, String result, int x, int y, int width, int height) { try { // 读取源图像 BufferedImage bi = ImageIO.read(new File(srcImageFile)); int srcWidth = bi.getWidth(); // 源图宽度 int srcHeight = bi.getHeight(); // 源图高度 if (srcWidth > 0 && srcHeight > 0) { Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); // 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) ImageFilter cropFilter = new CropImageFilter(x, y, width, height); Image img = Toolkit.getDefaultToolkit().createImage( new FilteredImageSource(image.getSource(), cropFilter)); BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics(); g.drawImage(img, 0, 0, width, height, null); // 绘制切割后的图 g.dispose(); // 输出为文件 ImageIO.write(tag, "JPEG", new File(result)); } } catch (Exception e) { e.printStackTrace(); } } public final static void cut2(String srcImageFile, String descDir, int rows, int cols) { try { if(rows<=0||rows>20) rows = 2; // 切片行数 if(cols<=0||cols>20) cols = 2; // 切片列数 // 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 > 0 && srcHeight > 0) { Image img; ImageFilter cropFilter; Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); int destWidth = srcWidth; // 每张切片的宽度 int destHeight = srcHeight; // 每张切片的高度 // 计算切片的宽度和高度 if (srcWidth % cols == 0) { destWidth = srcWidth / cols; } else { destWidth = (int) Math.floor(srcWidth 4000 / cols) + 1; } if (srcHeight % rows == 0) { destHeight = srcHeight / rows; } else { destHeight = (int) Math.floor(srcWidth / rows) + 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 * destWidth, i * destHeight, 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 + "_r" + i + "_c" + j + ".jpg")); } } } } catch (Exception e) { e.printStackTrace(); } } public final static void cut3(String srcImageFile, String descDir, int destWidth, int destHeight) { try { if(destWidth<=0) destWidth = 200; // 切片宽度 if(destHeight<=0) destHeight = 150; // 切片高度 // 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 img; ImageFilter cropFilter; Image image = bi.getScaledInstance(srcWidth, srcHeight, Image.SCALE_DEFAULT); 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 * destWidth, i * destHeight, 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 + "_r" + i + "_c" + j + ".jpg")); } } } } catch (Exception e) { e.printStackTrace(); } } public final static void convert(String srcImageFile, String formatName, String destImageFile) { try { File f = new File(srcImageFile); f.canRead(); f.canWrite(); BufferedImage src = ImageIO.read(f); ImageIO.write(src, formatName, new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } public final static void gray(String srcImageFile, String destImageFile) { try { BufferedImage src = ImageIO.read(new File(srcImageFile)); ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp op = new ColorConvertOp(cs, null); src = op.filter(src, null); ImageIO.write(src, "JPEG", new File(destImageFile)); } catch (IOException e) { e.printStackTrace(); } } public final static void pressText(String pressText, String srcImageFile, String destImageFile, String fontName, int fontStyle, Color color, int fontSize,int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int width = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, width, height, null); g.setColor(color); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 在指定坐标绘制水印文字 g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y); g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile));// 输出到文件流 } catch (Exception e) { e.printStackTrace(); } } public final static void pressText2(String pressText, String srcImageFile,String destImageFile, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int width = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, width, height, null); g.setColor(color); g.setFont(new Font(fontName, fontStyle, fontSize)); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 在指定坐标绘制水印文字 g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y); g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } public final static void pressImage(String pressImg, String srcImageFile,String destImageFile, int x, int y, float alpha) { try { File img = new File(srcImageFile); Image src = ImageIO.read(img); int wideth = src.getWidth(null); int height = src.getHeight(null); BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.drawImage(src, 0, 0, wideth, height, null); // 水印文件 Image src_biao = ImageIO.read(new File(pressImg)); int wideth_biao = src_biao.getWidth(null); int height_biao = src_biao.getHeight(null); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); g.drawImage(src_biao, (wideth - wideth_biao) / 2, (height - height_biao) / 2, wideth_biao, height_biao, null); // 水印文件结束 g.dispose(); ImageIO.write((BufferedImage) image, "JPEG", new File(destImageFile)); } catch (Exception e) { e.printStackTrace(); } } public final static int getLength(String text) { int length = 0; for (int i = 0; i < text.length(); i++) { if (new String(text.charAt(i) + "").getBytes().length > 1) { length += 2; } else { length += 1; } } return length / 2; } }
原文:http://www.cnblogs.com/liyunqi007/archive/2011/11/23/2260052.html
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