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    Advanced Compression

    Last updated: 2024-02-18 10:36:35

      Overview

      CI’s advanced compression feature allows you to easily convert images into formats that provide a high compression ratio, such as TPG and HEIF. This effectively reduces the transmission time, loading time, and the use of bandwidth and traffic.
      An image can be processed:
      Upon download
      Upon upload
      In cloud
      Feature
      Description
      TPG compression
      TPG is a Tencent-designed image format. Converting JPG, PNG, or WebP images into TPG greatly reduces the image sizes.
      HEIF compression
      If your images are used in iOS environments, you can convert them from JPG, PNG, GIF, WebP, or other formats into HEIF, which offers an ultra-high compression ratio.
      Note:
      To use Image Advanced Compression, you need to enable it on the bucket configuration page. For more information, please see Image Advanced Compression.
      To use the TPG format, ensure that the environment where images are loaded supports TPG decoding. CI provides TPG decoder−integrated SDKs for iOS, Android, and Windows clients to facilitate quick integration with TPG.
      Currently, iOS 11 or later and Android P have native support for the HEIF format.
      For the pricing of Image Advanced Compression, please see Billing and Pricing.

      API Format

      1. Processing upon download

      download_url?imageMogr2/format/<Format>

      2. Processing upon upload

      PUT /<ObjectKey> HTTP/1.1
      Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
      Date: GMT Date
      Authorization: Auth String
      Pic-Operations: 
      {
        "is_pic_info": 1,
        "rules": [{
            "fileid": "exampleobject",
            "rule": "imageMogr2/format/<Format>"
        }]
      }

      3. Processing in-cloud data

      POST /<ObjectKey>?image_process HTTP/1.1
      Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
      Date: GMT Date
      Content-length: Size
      Authorization: Auth String
      Pic-Operations: 
      {
        "is_pic_info": 1,
        "rules": [{
            "fileid": "exampleobject",
            "rule": "imageMogr2/format/<Format>"
        }]
      }
      Note:
      Processing upon download is used as an example here, which does not store the output image in a bucket. If you need to store the output image, please see Persistent Image Processing and use Processing upon upload or Processing in-cloud data.

      Parameters

      Parameter
      Description
      download_url
      URL of the input image, formatted as &lt;BucketName-APPID>.cos.&lt;Region>.myqcloud.com/&lt;picture name>
      Example: examplebucket-1250000000.cos.ap-shanghai.myqcloud.com/picture.jpeg
      /format/<Format>
      Target compression format, which can be TPG or HEIF

      Examples

      Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:
      
      
      You can convert the image into TPG format using the following URL:
      http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/tpg
      Alternatively, you can convert the image into HEIF format using the following URL:
      http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/heif
      Compression ratio comparison
      Format
      Image Size
      PNG (input image)
      1,335.2 KB
      TPG
      36.67 KB (compression ratio: 97.3%)
      HEIF
      52.87 KB (compression ratio: 96.0%)
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