If chromatic aberration or blurred images due to camera settings or device compatibility occur, you can use the feature provided by Alibaba Cloud CDN to change the brightness, contrast, and sharpness of images to improve image resolution and visual effects.
The image editing feature of Alibaba Cloud CDN, the image editing feature of DCDN, and the Image Processing (IMG) feature of Object Storage Service (OSS) are three different features.
Image editing is free of charge until further notice.
When you use the image editing feature, conversion between different image formats, such as JPEG to WebP, JPEG to PNG, and PNG to WebP, may result in larger image sizes. This is because different image formats use different compression algorithms. If you want to reduce image sizes, we recommend that you configure the
qualityparameter to reduce the image quality.
Parameters
The following table describes the parameters.
Parameter | Description | Valid value |
bright | The percentage by which you want to adjust the image brightness. | [-100, 100]
|
contrast | The contrast of the image. | [-100,100]
|
sharpen | The sharpness of the image. | [50,399] A greater value specifies a clearer image. However, an excessively large value may result in image artifacts. We recommend that you use the following values: 50, 100, 150, 200, 250, and 300. |
Examples
Sharpen an image by setting the sharpen parameter to 100. The request URL is
http(s)://example.com/image01.png?image_process=sharpen,100.Increase the brightness of the image by 50. The request URL is:
http(s)://example.com/image01.png?image_process=bright,50.Reduce the contrast of the image by 50. The request URL is
http(s)://example.com/image01.png?image_process=contrast,50.