图片处理
改变大小File picFile = new File("C:/pic/yui2.jpg"); FileOutputStream fos = new FileOutputStream(picFile); BufferedOutputStream bos = new BufferedOutputStream(fos); File picFileInput = new File("C:/pic/yui.jpg"); FileInputStream fis = new FileInputStream(picFileInput); BufferedInputStream bis = new BufferedInputStream(fis); BufferedImage bi = ImageIO.read(bis); BufferedImage bo = new BufferedImage(512, 384, BufferedImage.TYPE_INT_RGB); Image image = bi.getScaledInstance(512, 384, Image.SCALE_REPLICATE); bo.getGraphics().drawImage(image, 0, 0, null); ImageIO.write(bo, "jpg", bos); bos.close(); fos.close();
切割
/** *//** * 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(); } }
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