tencent cloud

Basic Image Processing
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Terakhir diperbarui:2024-06-25 10:53:13
Basic Image Processing
Terakhir diperbarui: 2024-06-25 10:53:13
Unduh PDF

Overview

COS has integrated Cloud Infinite (CI), a one-stop professional multimedia solution that offers the image processing features outlined below. For more information, please see Image Processing Overview.
Service
Feature
Description
Image Processing-Basic Services
Proportional scaling, scaling image to target width and height, and more
Cut (regular cropping), crop (scaling and cropping), iradius (inscribed circle cropping), and scrop (smart cropping)
Adaptive rotation and common rotation
Format conversion, GIF optimization, and progressive display
Changes the quality of images in JPG and WEBP formats
Blurs images
Sharpens images
Watermarking
Obtaining image information
Includes EXIF data
Performs quick format conversion, scaling, and cropping to generate thumbnails


SDK API References

For the parameters and method descriptions of all the APIs in the SDK, see SDK API Reference.

Scaling

Sample code

String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
String savePath = context.getExternalCacheDir().toString(); // Local path

GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
        savePath);
getObjectRequest.addQuery("imageMogr2/thumbnail/!50p", null);

cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest cosXmlRequest,
                          CosXmlResult cosXmlResult) {
        GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
    }

    // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
    // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});
Note:
For more samples, please visit GitHub.

Cropping

The following example shows how to process an in-cloud image and store the processing result in COS.

Sample code

String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
String savePath = context.getExternalCacheDir().toString(); // Local path

GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
        savePath);
getObjectRequest.addQuery("imageMogr2/iradius/150", null);

cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest cosXmlRequest,
                          CosXmlResult cosXmlResult) {
        GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
    }

    // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
    // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});
Note:
For more samples, please visit GitHub.

Rotating

The following sample shows how to process an image stored in COS upon the download:

Sample code

String bucket = "examplebucket-1250000000"; // Bucket, formatted as BucketName-APPID
String cosPath = "exampleobject"; // The location identifier of the object in the bucket, i.e., the object key
String savePath = context.getExternalCacheDir().toString(); // Local path

GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, cosPath,
        savePath);
getObjectRequest.addQuery("imageMogr2/rotate/90", null);

cosXmlService.getObjectAsync(getObjectRequest, new CosXmlResultListener() {
    @Override
    public void onSuccess(CosXmlRequest cosXmlRequest,
                          CosXmlResult cosXmlResult) {
        GetObjectResult getObjectResult = (GetObjectResult) cosXmlResult;
    }

    // If you use the Kotlin language to call this, please note that the exception in the callback method is nullable; otherwise, the onFail method will not be called back, that is:
    // clientException is of type CosXmlClientException? and serviceException is of type CosXmlServiceException?
    @Override
    public void onFail(CosXmlRequest cosXmlRequest,
                       @Nullable CosXmlClientException clientException,
                       @Nullable CosXmlServiceException serviceException) {
        if (clientException != null) {
            clientException.printStackTrace();
        } else {
            serviceException.printStackTrace();
        }
    }
});
Note:
For more samples, please visit GitHub.
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