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    WebP Compression

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

      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.
      CI launched the WebP compression feature to convert images to .webp format, which is superior to .jpg in terms of compression. A .webp image is over 25% smaller than a .jpg image with the same quality. This format is suitable for multi-terminal use cases.

      Restrictions

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

      Directions

      CI uses the imageMogr2 API to provide the WebP compression feature.
      This feature supports processing:
      During download
      During upload
      In the cloud
      Note:
      WebP compression is billed at basic image processing prices. For detailed pricing, see Image Processing Fees.
      If an image is converted to WebP format, some browsers may not be able to read its EXIF data. As a result, the image cannot be rotated. You can add the auto-orient parameter to rotate the input image first before compressing it (see Rotation) .
      WebP compression inherits the quality parameters of the input image by default. You can adjust the compression ratio by modifying the image quality as instructed in Quality Change.

      API Sample

      1. Processing during download

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

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

      Parameters

      Parameter
      Description
      ObjectKey
      Object name, such as folder/sample.jpg.
      /format/<Format>
      Compression format, which is webp here.

      Samples

      Note:
      Processing during 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 during upload or processing in-cloud data instead.
      Assume the input image is a 1,335.2 KB image in PNG format.
      img
      
      You can convert the image to WebP format by using the following request URL:
      http://example-1258125638.cos.ap-shanghai.myqcloud.com/sample.png?imageMogr2/format/webp
      Output:
      img
      
      Compression ratio comparison
      Format
      Image Size
      PNG (input image)
      1,335.2 KB
      WebP
      65 KB (compression ratio: 95.13%)
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