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    TPG Compression

    Last updated: 2024-06-12 15:20:05
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      Feature Overview

      Image compression is the process of downsizing an image as much as possible without sacrificing quality so that it can be stored at a lower cost and accessed more quickly.
      COS launched the TPG compression feature based on CI to convert images into TPG format, a Tencent-developed format with animated image support. Currently, products such as QQ Browser and Qzone have TPG support by default. TPG offers over 90% smaller file sizes at the same quality compared with GIF, and over 50% smaller file sizes compared with PNG.

      Restrictions

      Format: Images in JPG, PNG, BMP, GIF, WebP, HEIF, AVIF, or other formats can be converted into TPG.
      Size: The input image cannot be larger than 32 MB, with its width and height not exceeding 30,000 pixels, and the total number of pixels not exceeding 250 million. The width and height of the output image cannot exceed 9,999 pixels. For an input animated image, the total number of pixels (Width x Height x Number of frames) cannot exceed 250 million pixels.
      Number of frames (for animated images): For GIF, the number of frames cannot exceed 300.

      Prerequisites

      To use TPG compression, enable the image advanced compression feature for your bucket on the bucket’s configuration page. For more information, please see Setting Image Advanced Compression.
      To use the TPG format, ensure that the environment where images are loaded supports TPG decoding. Tencent Cloud CI provides the TPG decoder−integrated SDKs for iOS, Android, and Windows clients to facilitate quick integration with TPG.

      Directions

      COS uses the imageMogr2 API of CI to provide the TPG compression feature.
      An image can be processed:
      Upon download
      Upon upload
      In cloud
      Note:
      TPG Compression is charged by CI at image advanced compression rates. For detailed pricing, see Image Processing Fees.

      API Format

      1. Processing upon download

      GET /<ObjectKey>?imageMogr2/format/tpg HTTP/1.1
      Host: <BucketName-APPID>.cos.<Region>.myqcloud.com
      Date: <GMT Date>
      Authorization: <Auth String>

      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/tpg"
      }]
      }
      Note:
      Pic-Operations is a JSON string. Its parameters are as described in Persistent Image Processing.

      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/tpg"
      }]
      }
      Note:
      Authorization: Auth String (see Request Signature for more information)
      When this feature is used by a sub-account, relevant permissions must be granted as instructed in Authorization Granularity Details.

      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>
      Compression format, which is tpg

      Examples

      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, use Processing upon upload or Processing in-cloud data instead.
      Assume that the input image is a 1,335.2 KB image in PNG format, as shown below:
      img
      
      
      You can convert the image into TPG format by using the following URL:
      http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/tpg
      Compression ratio comparison
      Format
      Image Size
      PNG (input image)
      1,335.2 KB
      TPG
      36.67 KB (compression ratio: 97.3%)
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