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Persistent Image Processing
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Last updated: 2024-02-29 17:31:27
Persistent Image Processing
Last updated: 2024-02-29 17:31:27
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Overview

This document describes how to automatically process an image when you upload it to COS.
When the image is uploaded successfully, COS will save both the original and the processed images. You can later obtain the processing results by using a general download request.

Persistent Image Processing During Upload

Sample code

  // The bucket name must contain `appid`.
// For the API description, visit https://cloud.tencent.com/document/product/436/54050.
String bucketName = "examplebucket-1250000000";

String key = "test.jpg";
File localFile = new File("E://test.jpg");
PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
PicOperations picOperations = new PicOperations();
picOperations.setIsPicInfo(1);
// Add image processing rules
List<PicOperations.Rule> ruleList = new LinkedList<>();
PicOperations.Rule rule1 = new PicOperations.Rule();
rule1.setBucket(bucketName);
rule1.setFileId("test-1.jpg");
rule1.setRule("imageMogr2/rotate/90");
ruleList.add(rule1);
PicOperations.Rule rule2 = new PicOperations.Rule();
rule2.setBucket(bucketName);
rule2.setFileId("test-2.jpg");
rule2.setRule("imageMogr2/rotate/180");
ruleList.add(rule2);
picOperations.setRules(ruleList);
putObjectRequest.setPicOperations(picOperations);
try {
    PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
    CIUploadResult ciUploadResult = putObjectResult.getCiUploadResult();
    System.out.println(putObjectResult.getRequestId());
    System.out.println(ciUploadResult.getOriginalInfo().getEtag());
    for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
        System.out.println(ciObject.getLocation());
        System.out.println(ciObject.getEtag());
    }
} catch (CosServiceException e) {
    e.printStackTrace();
} catch (CosClientException e) {
    e.printStackTrace();
}

Parameter description

The PicOperations class is used to record image operations. Its main members are as described below:
Member
Description
Type
isPicInfo
Whether to return the input image information. Valid values: 0 (no), 1 (yes). Default value: 0.
int
rules
Processing rules (up to five rules are supported). Each rule corresponds to one processing result. If this parameter is not specified, images will not be processed.
List

Response parameter description

The CIUploadResult class is used to return the image processing result. Its main members are as described below:
Member
Description
Type
originalInfo
Input image information
OriginalInfo
processResults
Image processing result
ProcessResults
The OriginalInfo class is used to record the input image information. Its main members are as described below:
Member
Description
Type
key
Name of the input image
String
location
Image path
String
imageInfo
Input image information
ImageInfo
etag
ETag of the input image. If the output image overwrites the input image, the value of ETag will be that of the output image.
String
The ImageInfo class is used to record the input image information. Its main members are as described below:
Member
Description
Type
format
Format
String
width
Image width
Integer
height
Image height
Integer
quality
Image quality
Integer
ave
Image average hue
String
orientation
Image rotation angle
Integer
The ProcessResults class is used to record the image processing results. Its main members are as described below:
Member
Description
Type
objectList
Processing result of each image
List
The CIObject class is used to record the processing result of a single image. Its main members are as described below:
Member
Description
Type
key
Filename
String
location
Image path
String
format
Image format
String
width
Image width
Integer
height
Image height
Integer
size
Image size
Integer
quality
Image quality
Integer
etag
ETag of the output image
String

Processing In-Cloud Image

The following example shows how to process an image stored in COS and save the processing result to COS.

Sample code

String bucketName = "examplebucket-1250000000";
String key = "test.jpg";
ImageProcessRequest imageReq = new ImageProcessRequest(bucketName, key);

PicOperations picOperations = new PicOperations();
picOperations.setIsPicInfo(1);
List<PicOperations.Rule> ruleList = new LinkedList<>();
PicOperations.Rule rule1 = new PicOperations.Rule();
rule1.setBucket(bucketName);
rule1.setFileId("test-1.jpg");
rule1.setRule("imageMogr2/rotate/90");
ruleList.add(rule1);
PicOperations.Rule rule2 = new PicOperations.Rule();
rule2.setBucket(bucketName);
rule2.setFileId("test-2.jpg");
rule2.setRule("imageMogr2/rotate/180");
ruleList.add(rule2);
picOperations.setRules(ruleList);

imageReq.setPicOperations(picOperations);

CIUploadResult result = cosClient.processImage(imageReq);
result.getProcessResults();
result.getOriginalInfo();

try {
    CIUploadResult ciUploadResult = cosClient.processImage(imageReq);
    System.out.println(ciUploadResult.getOriginalInfo().getEtag());
    for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
        System.out.println(ciObject.getLocation());
        System.out.println(ciObject.getEtag());
    }
} catch (CosServiceException e) {
    e.printStackTrace();
} catch (CosClientException e) {
    e.printStackTrace();
}

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