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    Basic Image Processing

    Last updated: 2024-02-02 16:51:03
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      Overview

      COS has integrated Cloud Infinite (CI), a one-stop professional multimedia solution that offers the image processing features outlined below. For more information, see Image Processing Overview.
      Service
      Feature
      Description
      Basic Image Processing
      Proportional scaling, scaling image to target width and height, and more
      Cut (regular cropping), crop (scaling and cropping), iradius (inscribed circle cropping), and scrop (smart cropping)
      Adaptive rotation and common rotation
      Format conversion, GIF optimization, and progressive display
      Changes the quality of images in JPG and WEBP formats
      Blurs images
      Sharpens images
      Watermarking
      Obtaining image information
      Includes EXIF data
      Performs quick format conversion, scaling, and cropping to generate thumbnails
      

      Basic Image Processing

      When performing basic image processing, you need to specify the image processing rule. For more information, see Image Processing Overview. For all the code samples, visit GitHub. Below are some examples:

      Scaling

      String bucketName = "examplebucket-1250000000";
      String key = "qrcode.png";
      GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
      // Scale the width and height to 50% of the original image.
      String rule = "imageMogr2/thumbnail/!50p";
      getObj.putCustomQueryParameter(rule, null);
      cosClient.getObject(getObj, new File("qrcode-50p.png"));

      Cropping

      String bucketName = "examplebucket-1250000000";
      String key = "qrcode.png";
      GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
      // Crop the radius of an inscribed circle to an integer greater than 0 and less than half of the shorter side of the original image. The center of the inscribed circle is the center of the image.
      String rule = "imageMogr2/iradius/150";
      getObj.putCustomQueryParameter(rule, null);
      cosClient.getObject(getObj, new File("qrcode-cropping.png"));

      Rotation

      String bucketName = "examplebucket-1250000000";
      String key = "qrcode.png";
      GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
      // Rotate 90 degrees clockwise
      String rule = "imageMogr2/rotate/90";
      getObj.putCustomQueryParameter(rule, null);
      cosClient.getObject(getObj, new File("qrcode-rotate.png"));

      Obtaining average hue

      String bucketName = "examplebucket-1250000000";
      String key = "qrcode.png";
      GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
      // Obtaining image's average hue
      String rule = "imageAve";
      COSObject object = cosClient.getObject(getObj);
      COSObjectInputStream objectContent = object.getObjectContent();

      Obtaining basic image information

      String bucketName = "examplebucket-1250000000";
      String key = "qrcode.png";
      GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
      // Basic image information
      String rule = "imageInfo";
      getObj.putCustomQueryParameter(rule, null);
      COSObject object = cosClient.getObject(getObj);
      COSObjectInputStream objectContent = object.getObjectContent();
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