Image quality adjustment refers to the process of compressing images while maintaining their formats. Images have two types of qualities: absolute quality and relative quality. You can use the image quality adjustment feature to reduce image sizes and optimize traffic utilization.
Parameters
image_process=quality
The following table describes the parameters.
Parameter | Description | Value range |
Q | The absolute quality of the image. Image quality can be represented by an absolute value. You cannot adjust the image quality to a higher value. | The value must be a multiple of 5 between 0 and 100. Other values are not supported. Note A greater absolute value specifies higher quality and higher clarity. We recommend that you set Q to 95. |
q | The relative quality of the image. Image quality can be adjusted based on the original quality and a quality coefficient and represented by a relative value. | The value must be a multiple of 5 between 0 and 100. Other values are not supported. Note A greater relative value specifies higher quality and higher clarity. We recommend that you set q to 95. |
Examples
A request URL that changes the absolute quality is
http(s)://example.com/image01.png?image_process=quality,Q_90. If the current absolute quality is 95, the absolute quality after the conversion is 90. If the current absolute quality is 80, the absolute quality after the conversion is still 80.A request URL that changes the relative quality is
http(s)://example.com/image01.png?image_process=quality,q_90. If the current relative quality is 80, the relative quality after the conversion is 80 × 90% = 72.