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Basic Image Processing
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Last updated: 2024-02-02 14:36:36
Basic Image Processing
Last updated: 2024-02-02 14:36:36
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Overview

This document provides an overview of APIs and SDK code samples for basic image processing.
Service
Feature
Description
Basic image processing
Proportional scaling, scaling image to target width and height
Regular cropping, cropping and scaling, cropping to circle, smart face cropping
Adaptive rotation, regular rotation
Format conversion, GIF format optimization, progressive display
Quality change for JPG and WebP images
Image blurring
Image sharpening
Watermarking
Image information acquisition
Including EXIF information
Quick image format conversion, scaling, and cropping for thumbnail generation


Processing Image During Upload

The following example shows 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.

Sample code

PutObjectRequest request = new PutObjectRequest(bucket, key, srcPath);

JObject o = new JObject();
// Do not return the input image
o["is_pic_info"] = 0;
JArray rules = new JArray();
JObject rule = new JObject();
rule["bucket"] = bucket;
rule["fileid"] = "desample_photo.jpg";
// Processing parameters. For rules, visit https://cloud.tencent.com/document/product/436/44879.
rule["rule"] = "imageMogr2/thumbnail/400x400";
rules.Add(rule);
o["rules"] = rules;

string ruleString = o.ToString(Formatting.None);
request.SetRequestHeader("Pic-Operations", ruleString);
// Execute the request
PutObjectResult result = cosXml.PutObject(request);
Note:
For more complete samples, visit GitHub.

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

JObject o = new JObject();
// Do not return the input image
o["is_pic_info"] = 0;
JArray rules = new JArray();
JObject rule = new JObject();
rule["bucket"] = bucket;
rule["fileid"] = "desample_photo.jpg";
// Processing parameters. For rules, visit https://cloud.tencent.com/document/product/436/44879.
rule["rule"] = "imageMogr2/thumbnail/400x400";
rules.Add(rule);
o["rules"] = rules;
string ruleString = o.ToString(Formatting.None);

ImageProcessRequest request = new ImageProcessRequest(bucket, key, ruleString);
ImageProcessResult result = cosXml.ImageProcess(request);
Note:
For more complete samples, visit GitHub.

Processing Image During Download

The following example shows how to process an image stored in COS during download.

Sample code

GetObjectRequest getObjectRequest = new GetObjectRequest(bucket, key, localDir, localFileName);
// Processing parameters. This sample converts the image into TPG format. For the rules, visit https://cloud.tencent.com/document/product/436/44879.
getObjectRequest.SetQueryParameter("imageMogr2/format/tpg", null);
Note:
For more complete samples, visit GitHub.
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