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    Basic Image Processing

    Last updated: 2024-02-02 14:36:36
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      Overview

      This document provides an overview of APIs and SDK code samples for basic image processing.
      Service
      Feature
      Description
      Basic image processing
      Proportional scaling, scaling image to target width and height
      Regular cropping, cropping and scaling, cropping to circle, smart face cropping
      Adaptive rotation, regular rotation
      Format conversion, GIF format optimization, progressive display
      Quality change for JPG and WebP images
      Image blurring
      Image sharpening
      Watermarking
      Image information acquisition
      Including EXIF information
      Quick image format conversion, scaling, and cropping for thumbnail generation
      

      Processing Image During Upload

      The following example shows 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.

      Sample code

      PutObjectRequest request = new PutObjectRequest(bucket, key, srcPath);
      
      JObject o = new JObject();
      // Do not return the input image
      o["is_pic_info"] = 0;
      JArray rules = new JArray();
      JObject rule = new JObject();
      rule["bucket"] = bucket;
      rule["fileid"] = "desample_photo.jpg";
      // Processing parameters. For rules, visit https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1.
      rule["rule"] = "imageMogr2/thumbnail/400x400";
      rules.Add(rule);
      o["rules"] = rules;
      
      string ruleString = o.ToString(Formatting.None);
      request.SetRequestHeader("Pic-Operations", ruleString);
      // Execute the request
      PutObjectResult result = cosXml.PutObject(request);
      Note:
      For more complete samples, visit GitHub.

      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

      JObject o = new JObject();
      // Do not return the input image
      o["is_pic_info"] = 0;
      JArray rules = new JArray();
      JObject rule = new JObject();
      rule["bucket"] = bucket;
      rule["fileid"] = "desample_photo.jpg";
      // Processing parameters. For rules, visit https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1.
      rule["rule"] = "imageMogr2/thumbnail/400x400";
      rules.Add(rule);
      o["rules"] = rules;
      string ruleString = o.ToString(Formatting.None);
      
      ImageProcessRequest request = new ImageProcessRequest(bucket, key, ruleString);
      ImageProcessResult result = cosXml.ImageProcess(request);
      Note:
      For more complete samples, visit GitHub.

      Processing Image During Download

      The following example shows how to process an image stored in COS during download.

      Sample code

      GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key, localDir, localFileName);
      // Processing parameters. This sample converts the image into TPG format. For the rules, visit https://www.tencentcloud.com/document/product/436/44879?from_cn_redirect=1.
      getObjectRequest.SetQueryParameter("imageMogr2/format/tpg", null);
      Note:
      For more complete samples, visit GitHub.
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