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    Persistent Image Processing

    Last updated: 2024-02-29 17:31:27
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      Overview

      This document describes how to automatically process an image when you upload it to COS.
      When the image is uploaded successfully, COS will save both the original and the processed images. You can later obtain the processing results by using a general download request.

      Persistent Image Processing During Upload

      Sample code

        // The bucket name must contain `appid`.
      // For the API description, visit https://www.tencentcloud.com/document/product/436/54050?from_cn_redirect=1.
      String bucketName = "examplebucket-1250000000";
      
      String key = "test.jpg";
      File localFile = new File("E://test.jpg");
      PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
      PicOperations picOperations = new PicOperations();
      picOperations.setIsPicInfo(1);
      // Add image processing rules
      List<PicOperations.Rule> ruleList = new LinkedList<>();
      PicOperations.Rule rule1 = new PicOperations.Rule();
      rule1.setBucket(bucketName);
      rule1.setFileId("test-1.jpg");
      rule1.setRule("imageMogr2/rotate/90");
      ruleList.add(rule1);
      PicOperations.Rule rule2 = new PicOperations.Rule();
      rule2.setBucket(bucketName);
      rule2.setFileId("test-2.jpg");
      rule2.setRule("imageMogr2/rotate/180");
      ruleList.add(rule2);
      picOperations.setRules(ruleList);
      putObjectRequest.setPicOperations(picOperations);
      try {
          PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
          CIUploadResult ciUploadResult = putObjectResult.getCiUploadResult();
          System.out.println(putObjectResult.getRequestId());
          System.out.println(ciUploadResult.getOriginalInfo().getEtag());
          for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
              System.out.println(ciObject.getLocation());
              System.out.println(ciObject.getEtag());
          }
      } catch (CosServiceException e) {
          e.printStackTrace();
      } catch (CosClientException e) {
          e.printStackTrace();
      }

      Parameter description

      The PicOperations class is used to record image operations. Its main members are as described below:
      Member
      Description
      Type
      isPicInfo
      Whether to return the input image information. Valid values: 0 (no), 1 (yes). Default value: 0.
      int
      rules
      Processing rules (up to five rules are supported). Each rule corresponds to one processing result. If this parameter is not specified, images will not be processed.
      List

      Response parameter description

      The CIUploadResult class is used to return the image processing result. Its main members are as described below:
      Member
      Description
      Type
      originalInfo
      Input image information
      OriginalInfo
      processResults
      Image processing result
      ProcessResults
      The OriginalInfo class is used to record the input image information. Its main members are as described below:
      Member
      Description
      Type
      key
      Name of the input image
      String
      location
      Image path
      String
      imageInfo
      Input image information
      ImageInfo
      etag
      ETag of the input image. If the output image overwrites the input image, the value of ETag will be that of the output image.
      String
      The ImageInfo class is used to record the input image information. Its main members are as described below:
      Member
      Description
      Type
      format
      Format
      String
      width
      Image width
      Integer
      height
      Image height
      Integer
      quality
      Image quality
      Integer
      ave
      Image average hue
      String
      orientation
      Image rotation angle
      Integer
      The ProcessResults class is used to record the image processing results. Its main members are as described below:
      Member
      Description
      Type
      objectList
      Processing result of each image
      List
      The CIObject class is used to record the processing result of a single image. Its main members are as described below:
      Member
      Description
      Type
      key
      Filename
      String
      location
      Image path
      String
      format
      Image format
      String
      width
      Image width
      Integer
      height
      Image height
      Integer
      size
      Image size
      Integer
      quality
      Image quality
      Integer
      etag
      ETag of the output image
      String

      Processing In-Cloud Image

      The following example shows how to process an image stored in COS and save the processing result to COS.

      Sample code

      String bucketName = "examplebucket-1250000000";
      String key = "test.jpg";
      ImageProcessRequest imageReq = new ImageProcessRequest(bucketName, key);
      
      PicOperations picOperations = new PicOperations();
      picOperations.setIsPicInfo(1);
      List<PicOperations.Rule> ruleList = new LinkedList<>();
      PicOperations.Rule rule1 = new PicOperations.Rule();
      rule1.setBucket(bucketName);
      rule1.setFileId("test-1.jpg");
      rule1.setRule("imageMogr2/rotate/90");
      ruleList.add(rule1);
      PicOperations.Rule rule2 = new PicOperations.Rule();
      rule2.setBucket(bucketName);
      rule2.setFileId("test-2.jpg");
      rule2.setRule("imageMogr2/rotate/180");
      ruleList.add(rule2);
      picOperations.setRules(ruleList);
      
      imageReq.setPicOperations(picOperations);
      
      CIUploadResult result = cosClient.processImage(imageReq);
      result.getProcessResults();
      result.getOriginalInfo();
      
      try {
          CIUploadResult ciUploadResult = cosClient.processImage(imageReq);
          System.out.println(ciUploadResult.getOriginalInfo().getEtag());
          for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
              System.out.println(ciObject.getLocation());
              System.out.println(ciObject.getEtag());
          }
      } catch (CosServiceException e) {
          e.printStackTrace();
      } catch (CosClientException e) {
          e.printStackTrace();
      }
      
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