Updated at: 2022-12-30 15:54
The quality adjustment operation uses the format of a source image to compress the image. You can use the quality adjustment parameters to modify the quality of source images stored in Object Storage Service (OSS). This topic describes the parameters and examples for image quality adjustment.
Quality adjustment applies only to JPG and WebP images.
Operation name: quality
The following table describes the parameters that you can configure when you adjust the quality of an image.
| Parameter | Description | Valid value |
|---|---|---|
| q | Specifies the relative quality of the image and compresses the source image based on percentage.If the source image quality is 100%, you can obtain an image whose quality value is 90% after you add the quality,q_90 parameter. If the quality value of the source image is 80%, you can obtain an image whose quality value is 72% after you add the quality,q_90 parameter.NoteThe q parameter applies only to source images in the JPG format to specify the relative quality of the images. If a source image is in the WebP format, this parameter works the same as Q. The absolute quality is specified for the image. |
[1,100] |
You can set image processing parameters through file URL and API. This article takes file URL as an example. This article uses examples/example.jpg.
This test is based on comprehensive example
The image access address is:
http://127.0.0.1:8080/file/example.jpg
-
Adjust the relative quality of an image
Configure the parameters based on the following requirements:
- Resize the image to a width of 100 pixels:
resize,w_100 - Set the relative quality value of the image to 80%:
quality,q_80
The URL used to process the image is in the following format: http://127.0.0.1:8080/file/example.jpg?x-oss-process=image/resize,w_100/quality,q_80
- Resize the image to a width of 100 pixels:
