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    HEIF Compression

    Last updated: 2024-02-18 10:36:35
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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.
      CI launched the HEIF compression feature to convert images into HEIF format that offers an ultra-high compression ratio. HEIF offers over 80% smaller file sizes at the same quality compared with JPG. iOS has adopted HEIF as the default image format, and Android P has native support for this format.

      Restrictions

      Format: Images in JPG, PNG, BMP, WebP, TPG, AVIF, or other formats can be converted into HEIF.
      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.

      Preparation

      To use HEIF compression, enable the image advanced compression feature for your bucket on the bucket’s configuration page. For more information, see Setting Image Advanced Compression.

      Use Directions

      CI uses the imageMogr2 API to provide the HEIF compression feature.
      An image can be processed:
      Upon download
      Upon upload
      In cloud
      Note:
      HEIF compression is billed at the image advanced compression ratio. For detailed pricing, see Image Processing Fees.

      API Format

      1. Processing upon download

      download_url?imageMogr2/format/heif

      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/heif"
      }]
      }
      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/heif"
      }]
      }
      Note:
      Authorization: Auth String (See Request Signature for details.)
      When this feature is used by a sub-account, relevant permissions must be granted.

      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 heif

      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 HEIF format by 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
      HEIF
      52.87 KB (compression ratio: 96.0%)
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