Question

我有旋转图像的功能。虽然我正在失去质量。有没有任何改变可以改善它？

 public BufferedImage RotateImage(String imagePath,int degrees) throws IOException{ 
         File file = new File(imagePath);
         Image image = ImageIO.read(file);
         BufferedImage img=bufferImage(image, BufferedImage.TYPE_INT_RGB);

         AffineTransform tx = new AffineTransform();
         double radians = (Math.PI / 180) * degrees;

         double width = img.getWidth()/2;
         double height = img.getHeight()/2;

         if(degrees != 180){
             tx.translate(height,width);
             tx.rotate(radians);
             tx.translate(-width,-height);
         }else{                      
         tx.rotate(radians,width, height);
         }

         AffineTransformOp op = new AffineTransformOp(tx, AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
         img = op.filter(img, null);
         return img;
         }

Answer 1

AffineTransform过滤参数提到的其他几个参数很重要，但它也取决于图像的编码。如果是JPEG，lossless rotation isn't universally possible。

Answer 2

AffineTransformOp.TYPE_NEAREST_NEIGHBOR总会让一切看起来都像blergh。尝试使用AffineTransformOp.TYPE_BILINEAR或AffineTransformOp.TYPE_BICUBIC。

Answer 3

Try using bicubic or bilinear。链接显示了每个的示例。

AffineTransformOp op = 
    new AffineTransformOp(tx, AffineTransformOp.TYPE_BILINEAR);

Answer 4

尝试使用其中之一 TYPE_BICUBIC

或

TYPE_BILINEAR

Java旋转图像丢失质量

4 个答案: