2021 08 11

2021-08-11

Java 이미지 리사이징

• 참고 1: https://handcoding.tistory.com/147
• 참고 2: https://solbel.tistory.com/893
• 참고 3: https://www.baeldung.com/java-resize-image
• imageUtil 라이브러리 - 링크: https://www.gotoquiz.com/web-coding/programming/java-programming/resize-images-in-java-preserving-image-quality/

  Image img = ImageLoader.fromUrl("~");
  //특정 크기로 잘라내기
  Image cropped = img.crop(200, 200, 500, 350);
  cropped.writeToJPG(new File("cropped.jpg"), 0.95f);
  cropped.dispose();
  
  //넓이 400으로 리사이징 나머지 높이 원본 비율로 처리
  Image resized = img.getResizedToWidth(400);
  

• javax.imageio.ImageIO

  public static void main(String[] args){
      String path = "C:\\Image.png";
      File file = new File(path);
  
      BufferedImage originalImage = ImageIO.read(new File(file));
      BufferedImage resizedImage = resizeImage(originalImage, 2);
  }
  
  private static BufferedImage resizeImage(BufferedImage originalImage, int type) {
      BufferedImage resizedImage = new BufferedImage(300, 300, type);
      Graphics2D g = resizedImage.createGraphics();
      g.drawImage(originalImage, 0, 0, 300, 300, null);
      g.dispose();
  
      return resizedImage;
  }
  

  public static void main(String[] args){
      Image image = ImageIO.read(new File(path));
      int imageWidth = image.getWidth();
      int imageHeight = image.getHeight();
  
      Image resizedImage = image.getScaledInstance(300, 300, Image.SCALE_SMOOTH);
  }
  

• 밸덩 ImageResize 1. java.awt.Graphics2D - 2D 모양 리사이징

  BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) {
      BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
      Graphics2D graphics2D = resizedImage.createGraphics();  
      graphics2D.drawImage(originalImage, 0, 0, targetWidth, targetHeight, null);
      graphics2D.dispose();
      return resizedImage;
  }
  

    - graphics2D.setRenderingHint() 를 통해 이미지 퀄리티, 이미지 프로세싱 속도 설정 가능
  

  2. Image.getScaledInstance() java BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) { Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_DEFAULT); BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB); outputImage.getGraphics().drawImage(resultingImage, 0, 0, null); return outputImage; }