Basic Image Processing

Overview
This document provides an overview of APIs and SDK code samples related to basic image processing.
API
Operation
Scaling
Scales up/down an image
Cropping
Crops an image, including regular cropping, scaling and cropping, inscribed circle cropping, rounded corner cropping, and smart cropping
Rotation
Rotates an image, including common rotation and adaptive rotation
Format conversion
Converts the format of an image, optimizes GIF format, and performs progressive display
Quality conversion
Adjusts the quality of an image
Gaussian blurring
Blurs an image by a Gaussian function
Sharpening
Sharpens an image
Image watermarks
Adds a watermark to an image
Text watermarks
Adds a real-time text watermark to an image
Obtaining basic image information
Obtains the basic information (such as format, length, and height) about an image
Obtaining image EXIF data
Obtains the EXIF data of an image
Obtaining the image average hue
Obtains the average hue of an image
Removing metadata
Removes the image metadata, including the EXIF data
Quick thumbnail template
Provides an image processing template to generate thumbnails
Pipeline operator
Performs multiple operations on images in sequence
Scaling
Description
CI uses the imageMogr2 API to scale an image.
Sample request
#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>
﻿
// `endpoint` is the COS access domain name. For more information, visit https://intl.cloud.tencent.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char *TEST_ACCESS_KEY_ID;                //your secret_id
static char *TEST_ACCESS_KEY_SECRET;            //your secret_key
// A unique user-level resource identifier for COS access. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char TEST_APPID[] = "<APPID>";    //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.cloud.tencent.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>"; 
﻿
void log_status(cos_status_t *s)
{
    cos_warn_log("status->code: %d", s->code);
    if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
    if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
    if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}
﻿
void init_test_config(cos_config_t *config, int is_cname)
{
    cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
    cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
    cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
    cos_str_set(&config->appid, TEST_APPID);
    config->is_cname = is_cname;
}
﻿
void init_test_request_options(cos_request_options_t *options, int is_cname)
{
    options->config = cos_config_create(options->pool);
    init_test_config(options->config, is_cname);
    options->ctl = cos_http_controller_create(options->pool, 0);
}
﻿
void test_image_scale()
{
    cos_pool_t *p = NULL;
    int is_cname = 0; 
    cos_status_t *s = NULL;
    cos_request_options_t *options = NULL;
    cos_string_t bucket;
    cos_string_t object;
    cos_string_t file;
    cos_table_t *resp_headers;
    cos_table_t *params = NULL;
﻿
    cos_pool_create(&p, NULL);
    options = cos_request_options_create(p);
    init_test_request_options(options, is_cname);
    cos_str_set(&bucket, TEST_BUCKET_NAME);
﻿
    params = cos_table_make(p, 1);
    apr_table_addn(params, "imageMogr2/thumbnail/!50p", "");
    cos_str_set(&file, "test.jpg");
    cos_str_set(&object, "test.jpg");
    s = cos_get_object_to_file(options, &bucket, &object, NULL, params, &file, &resp_headers);
    log_status(s);
    if (!cos_status_is_ok(s)) {
        printf("cos_get_object_to_file fail, req_id:%s\n", s->req_id);
    }
    cos_pool_destroy(p);
}
﻿
int main(int argc, char *argv[])
{
    // Get SecretId and SecretKey from environment variables
    TEST_ACCESS_KEY_ID     = getenv("COS_SECRETID");
    TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");
﻿
    if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
       exit(1);
    }
﻿
    //set log level, default COS_LOG_WARN
    cos_log_set_level(COS_LOG_WARN);
﻿
    //set log output, default stderr
    cos_log_set_output(NULL);
﻿
    test_image_scale();
﻿
    cos_http_io_deinitialize();
﻿
    return 0;
}
Cropping
Description
CI uses the imageMogr2 API to crop images, such as regular cropping, scaling and cropping, inscribed circle cropping, rounded corner cropping, and smart cropping.
Sample request
#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>
﻿
// `endpoint` is the COS access domain name. For more information, visit https://intl.cloud.tencent.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char *TEST_ACCESS_KEY_ID;                //your secret_id
static char *TEST_ACCESS_KEY_SECRET;            //your secret_key
// A unique user-level resource identifier for COS access. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char TEST_APPID[] = "<APPID>";    //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.cloud.tencent.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>"; 
﻿
void log_status(cos_status_t *s)
{
    cos_warn_log("status->code: %d", s->code);
    if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
    if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
    if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}
﻿
void init_test_config(cos_config_t *config, int is_cname)
{
    cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
    cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
    cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
    cos_str_set(&config->appid, TEST_APPID);
    config->is_cname = is_cname;
}
﻿
void init_test_request_options(cos_request_options_t *options, int is_cname)
{
    options->config = cos_config_create(options->pool);
    init_test_config(options->config, is_cname);
    options->ctl = cos_http_controller_create(options->pool, 0);
}
﻿
void test_image_cut()
{
    cos_pool_t *p = NULL;
    int is_cname = 0; 
    cos_status_t *s = NULL;
    cos_request_options_t *options = NULL;
    cos_string_t bucket;
    cos_string_t object;
    cos_string_t file;
    cos_table_t *resp_headers;
    cos_table_t *params = NULL;
﻿
    cos_pool_create(&p, NULL);
    options = cos_request_options_create(p);
    init_test_request_options(options, is_cname);
    cos_str_set(&bucket, TEST_BUCKET_NAME);
﻿
    params = cos_table_make(p, 1);
    apr_table_addn(params, "imageMogr2/cut/600x600x100x10", "");
    cos_str_set(&file, "test.jpg");
    cos_str_set(&object, "test.jpg");
    s = cos_get_object_to_file(options, &bucket, &object, NULL, params, &file, &resp_headers);
    log_status(s);
    if (!cos_status_is_ok(s)) {
        printf("cos_get_object_to_file fail, req_id:%s\n", s->req_id);
    }
    cos_pool_destroy(p);
}
﻿
int main(int argc, char *argv[])
{
    // Get SecretId and SecretKey from environment variables
    TEST_ACCESS_KEY_ID     = getenv("COS_SECRETID");
    TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");
﻿
    if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
       exit(1);
    }
﻿
    //set log level, default COS_LOG_WARN
    cos_log_set_level(COS_LOG_WARN);
﻿
    //set log output, default stderr
    cos_log_set_output(NULL);
﻿
    test_image_cut();
﻿
    cos_http_io_deinitialize();
﻿
    return 0;
}
Other basic image processing operations
Description
You can perform other basic processing operations on images by changing the value of the operation parameter. For example, you can rotate the image clockwise by 90 degrees as follows:
#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>
﻿
// `endpoint` is the COS access domain name. For more information, visit https://intl.cloud.tencent.com/document/product/436/6224.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char *TEST_ACCESS_KEY_ID;                //your secret_id
static char *TEST_ACCESS_KEY_SECRET;            //your secret_key
// A unique user-level resource identifier for COS access. It can be obtained at https://console.cloud.tencent.com/cam/capi.
static char TEST_APPID[] = "<APPID>";    //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.cloud.tencent.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>"; 
﻿
void log_status(cos_status_t *s)
{
    cos_warn_log("status->code: %d", s->code);
    if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
    if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
    if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}
﻿
void init_test_config(cos_config_t *config, int is_cname)
{
    cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
    cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
    cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
    cos_str_set(&config->appid, TEST_APPID);
    config->is_cname = is_cname;
}
﻿
void init_test_request_options(cos_request_options_t *options, int is_cname)
{
    options->config = cos_config_create(options->pool);
    init_test_config(options->config, is_cname);
    options->ctl = cos_http_controller_create(options->pool, 0);
}
﻿
void test_image_rotate()
{
    cos_pool_t *p = NULL;
    int is_cname = 0; 
    cos_status_t *s = NULL;
    cos_request_options_t *options = NULL;
    cos_string_t bucket;
    cos_string_t object;
    cos_string_t file;
    cos_table_t *resp_headers;
    cos_table_t *params = NULL;
﻿
    cos_pool_create(&p, NULL);
    options = cos_request_options_create(p);
    init_test_request_options(options, is_cname);
    cos_str_set(&bucket, TEST_BUCKET_NAME);
﻿
    params = cos_table_make(p, 1);
    apr_table_addn(params, "imageMogr2/rotate/90", "");
    cos_str_set(&file, "test.jpg");
    cos_str_set(&object, "test.jpg");
    s = cos_get_object_to_file(options, &bucket, &object, NULL, params, &file, &resp_headers);
    log_status(s);
    if (!cos_status_is_ok(s)) {
        printf("cos_get_object_to_file fail, req_id:%s\n", s->req_id);
    }
    cos_pool_destroy(p);
}
﻿
int main(int argc, char *argv[])
{
    // Get SecretId and SecretKey from environment variables
    TEST_ACCESS_KEY_ID     = getenv("COS_SECRETID");
    TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");
﻿
    if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
       exit(1);
    }
﻿
    //set log level, default COS_LOG_WARN
    cos_log_set_level(COS_LOG_WARN);
﻿
    //set log output, default stderr
    cos_log_set_output(NULL);
﻿
    test_image_rotate();
﻿
    cos_http_io_deinitialize();
﻿
    return 0;
}

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tencent cloud

Overview

Scaling

Description

Sample request

Cropping

Description

Sample request

Other basic image processing operations

Description

About Tencent Cloud

Help & Support

Resources

User Center

API	Operation
Scaling	Scales up/down an image
Cropping	Crops an image, including regular cropping, scaling and cropping, inscribed circle cropping, rounded corner cropping, and smart cropping
Rotation	Rotates an image, including common rotation and adaptive rotation
Format conversion	Converts the format of an image, optimizes GIF format, and performs progressive display
Quality conversion	Adjusts the quality of an image
Gaussian blurring	Blurs an image by a Gaussian function
Sharpening	Sharpens an image
Image watermarks	Adds a watermark to an image
Text watermarks	Adds a real-time text watermark to an image
Obtaining basic image information	Obtains the basic information (such as format, length, and height) about an image
Obtaining image EXIF data	Obtains the EXIF data of an image
Obtaining the image average hue	Obtains the average hue of an image
Removing metadata	Removes the image metadata, including the EXIF data
Quick thumbnail template	Provides an image processing template to generate thumbnails
Pipeline operator	Performs multiple operations on images in sequence

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Overview

Scaling

Description

Sample request

Cropping

Description

Sample request

Other basic image processing operations

Description

About Tencent Cloud

Help & Support

Resources

User Center