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    Basic Image Processing

    Last updated: 2024-02-01 17:32:35
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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, please see Image Processing Overview.
      Service
      Feature
      Description
      Image Processing-Basic Services
      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
      

      SDK API References

      For the parameters and method descriptions of all the APIs in the SDK, see SDK API Reference.

      Scaling

      Sample code

      String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
      String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
      String savePath = context.getExternalCacheDir().toString(); // Local path
      
      GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
              savePath);
      getObjectRequest.addQuery("imageMogr2/thumbnail/!50p", null);
      
      cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
          @Override
          public void onSuccess(CosXmlRequest cosXmlRequest,
                                CosXmlResult cosXmlResult) {
              GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
          }
      
          // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
          // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
          @Override
          public void onFail(CosXmlRequest cosXmlRequest,
                             @Nullable CosXmlClientException clientException,
                             @Nullable CosXmlServiceException serviceException) {
              if (clientException != null) {
                  clientException.printStackTrace();
              } else {
                  serviceException.printStackTrace();
              }
          }
      });
      Note:
      For more samples, please visit GitHub.

      Cropping

      The following example shows how to process an in-cloud image and store the processing result in COS.

      Sample code

      String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
      String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
      String savePath = context.getExternalCacheDir().toString(); // Local path
      
      GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
              savePath);
      getObjectRequest.addQuery("imageMogr2/iradius/150", null);
      
      cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
          @Override
          public void onSuccess(CosXmlRequest cosXmlRequest,
                                CosXmlResult cosXmlResult) {
              GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
          }
      
          // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
          // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
          @Override
          public void onFail(CosXmlRequest cosXmlRequest,
                             @Nullable CosXmlClientException clientException,
                             @Nullable CosXmlServiceException serviceException) {
              if (clientException != null) {
                  clientException.printStackTrace();
              } else {
                  serviceException.printStackTrace();
              }
          }
      });
      Note:
      For more samples, please visit GitHub.

      Rotating

      The following sample shows how to process an image stored in COS upon the download:

      Sample code

      String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
      String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
      String savePath = context.getExternalCacheDir().toString(); // Local path
      
      GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
              savePath);
      getObjectRequest.addQuery("imageMogr2/rotate/90", null);
      
      cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
          @Override
          public void onSuccess(CosXmlRequest cosXmlRequest,
                                CosXmlResult cosXmlResult) {
              GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
          }
      
          // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
          // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
          @Override
          public void onFail(CosXmlRequest cosXmlRequest,
                             @Nullable CosXmlClientException clientException,
                             @Nullable CosXmlServiceException serviceException) {
              if (clientException != null) {
                  clientException.printStackTrace();
              } else {
                  serviceException.printStackTrace();
              }
          }
      });
      Note:
      For more samples, please visit GitHub.
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