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    Basic Image Processing

    Last updated: 2024-02-29 16:06:23
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      Overview

      This document provides an overview of APIs and SDK code samples for basic image processing.
      API
      Description
      Scales up/down an image.
      Crops an image, including regular cropping, scaling and cropping, cropping to circle, rounded corner cropping, and smart face cropping.
      Rotates an image, including regular rotation and adaptive rotation.
      Converts the format of an image, optimizes the GIF format, and performs progressive display.
      Adjusts the quality of an image.
      Blurs an image by a Gaussian function.
      Sharpens an image.
      Adds a watermark to an image.
      Adds a real-time text watermark to an image.
      Queries the basic information of an image, such as format, width, and height.
      Queries the EXIF data of an image.
      Queries the average hue of an image.
      Removes the image metadata, including the EXIF data.
      Generates a thumbnail through an image processing template.
      Performs multiple operations on an image in sequence.

      Scaling

      Feature description

      CI uses the imageMogr2 API to scale images.

      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://www.tencentcloud.com/document/product/436/6224?from_cn_redirect=1.
      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.tencentcloud.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.tencentcloud.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.tencentcloud.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

      Feature description

      CI uses the imageMogr2 API to crop images, including regular cropping, scaling and cropping, cropping to circle, rounded corner cropping, and smart face 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://www.tencentcloud.com/document/product/436/6224?from_cn_redirect=1.
      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.tencentcloud.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.tencentcloud.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.tencentcloud.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

      Feature 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://www.tencentcloud.com/document/product/436/6224?from_cn_redirect=1.
      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.tencentcloud.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.tencentcloud.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.tencentcloud.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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