//size(宽度, 高度) 
 
/* 
 * 若图片横比200小，高比300小，不变 
 * 若图片横比200小，高比300大，高缩小到300，图片比例不变 
 * 若图片横比200大，高比300小，横缩小到200，图片比例不变 
 * 若图片横比200大，高比300大，图片按比例缩小，横为200或高为300 
 */ 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(200, 300) 
  .toFile("c:/a380_200x300.jpg"); 
 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(2560, 2048) 
  .toFile("c:/a380_2560x2048.jpg"); 

//scale(比例) 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .scale(0.25f) 
  .toFile("c:/a380_25%.jpg"); 
 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .scale(1.10f) 
  .toFile("c:/a380_110%.jpg"); 

//keepAspectRatio(false)默认是按照比例缩放的 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(200,200) 
  .keepAspectRatio(false) 
  .toFile("c:/a380_200x200.jpg"); 

//rotate(角度),正数：顺时针负数：逆时针 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .rotate(90) 
  .toFile("c:/a380_rotate+90.jpg"); 
 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .rotate(-90) 
  .toFile("c:/a380_rotate-90.jpg"); 

//watermark(位置，水印图，透明度) 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .watermark(Positions.BOTTOM_RIGHT,ImageIO.read(newFile("images/watermark.png")),0.5f) 
  .outputQuality(0.8f) 
  .toFile("c:/a380_watermark_bottom_right.jpg"); 
 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .watermark(Positions.CENTER,ImageIO.read(newFile("images/watermark.png")),0.5f) 
  .outputQuality(0.8f) 
  .toFile("c:/a380_watermark_center.jpg"); 

//sourceRegion() 
 
//图片中心400*400的区域 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .sourceRegion(Positions.CENTER,400,400) 
  .size(200,200) 
  .keepAspectRatio(false) 
  .toFile("c:/a380_region_center.jpg"); 
 
//图片右下400*400的区域 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .sourceRegion(Positions.BOTTOM_RIGHT,400,400) 
  .size(200,200) 
  .keepAspectRatio(false) 
  .toFile("c:/a380_region_bootom_right.jpg"); 
 
//指定坐标 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .sourceRegion(600,500,400,400) 
  .size(200,200) 
  .keepAspectRatio(false) 
  .toFile("c:/a380_region_coord.jpg"); 

//outputFormat(图像格式) 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .outputFormat("png") 
  .toFile("c:/a380_1280x1024.png"); 
 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .outputFormat("gif") 
  .toFile("c:/a380_1280x1024.gif"); 

//toOutputStream(流对象) 
OutputStreamos=newFileOutputStream("c:/a380_1280x1024_OutputStream.png"); 
Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .toOutputStream(os); 

//asBufferedImage()返回BufferedImage 
BufferedImagethumbnail=Thumbnails.of("images/a380_1280x1024.jpg") 
  .size(1280,1024) 
  .asBufferedImage(); 
ImageIO.write(thumbnail,"jpg",newFile("c:/a380_1280x1024_BufferedImage.jpg"));