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    Basic Image Processing

    Last updated: 2021-06-09 14:27:13
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      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

      Feature description

      Tencent Cloud’s CI uses the imageMogr2 API to scale images.

      Sample request

      c
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);
options->config = cos_config_create(options->pool);
cos_str_set(&options->config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&options->config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&options->config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&options->config->appid, TEST_APPID);
options->config->is_cname = is_cname;
options->ctl = cos_http_controller_create(options->pool, 0);
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);

      Cropping

      Feature 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

      c
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);
options->config = cos_config_create(options->pool);
cos_str_set(&options->config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&options->config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&options->config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&options->config->appid, TEST_APPID);
options->config->is_cname = is_cname;
options->ctl = cos_http_controller_create(options->pool, 0);
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);

      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:

      c
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);
options->config = cos_config_create(options->pool);
cos_str_set(&options->config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&options->config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&options->config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&options->config->appid, TEST_APPID);
options->config->is_cname = is_cname;
options->ctl = cos_http_controller_create(options->pool, 0);
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);
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