Processing an Image

If you have any questions during the development, post them on the Issues page of GitHub. For details about parameters and usage of each API, see the API Reference.

OBS can be used to process images in a stable, secure, efficient, easy to use, and cost-efficient manner. If the object to be downloaded is an image, you can pass the image processing parameters to operate it, including cutting and resizing it as well as putting a watermark and converting the format.

For more information, see Image Processing Feature Guide.

Sample code:

// Initialize configuration parameters.
ObsConfig config = new ObsConfig();
config.Endpoint = "https://your-endpoint";
// Hard-coded or plaintext AK/SK are risky. For security purposes, encrypt your AK/SK and store them in the configuration file or environment variables. In this example, the AK/SK are stored in environment variables for identity authentication. Before running this example, configure environment variables AccessKeyID and SecretAccessKey.
// Obtain an AK/SK pair on the management console. For details, see https://support.huaweicloud.com/intl/en-us/usermanual-ca/ca_01_0003.html.
string accessKey= Environment.GetEnvironmentVariable("AccessKeyID", EnvironmentVariableTarget.Machine);
string secretKey= Environment.GetEnvironmentVariable("SecretAccessKey", EnvironmentVariableTarget.Machine);
// Create an instance of ObsClient.
ObsClient client = new ObsClient(accessKey, secretKey, config);

try
{
    GetObjectRequest request = new GetObjectRequest()
    {
        BucketName = "bucketname",
        ObjectKey = "objectname",
        // Resize and rotate the image in sequence.
        ImageProcess = "image/resize,m_fixed,w_100,h_100/rotate,90",
    };
    GetObjectResponse response = client.GetObject(request);
    Console.WriteLine("Get object response: {0}", response.StatusCode);
}
catch (ObsException ex)
{
   Console.WriteLine("ErrorCode: {0}", ex.ErrorCode);
   Console.WriteLine("ErrorMessage: {0}", ex.ErrorMessage);
} 

• Use GetObjectRequest.ImageProcess to specify the image processing parameters.
• Image processing parameters can be processed in cascading mode. This indicates that multiple commands can be performed on an image in sequence.