Feature #2: Color of the first pixel

Print the color in RGB of the first pixel (top, left or coordinates 0,0) in the output terminal.

Feature description

Print the color in RGB of the first pixel (top, left or coordinates 0,0) in the output terminal. A possible prototype:

void first_pixel (char *source_path);

Parameters	value
name	first_pixel
Command	-c first_pixel
Input	an image
output	first_pixel: R, G, B R, G, B are the integer values of the components in the range 0-255

Usage

freud.exe -f ./images/input/image.jpeg -c first_pixel 

Output

first_pixel: 89, 139, 164

Describe tips for implementing feature

Define first_pixel in src/features.h. Implement first_pixel in src/features.c. Use the data from the function read_image_data from <estia-image.h>.

int read_image_data(const char *filename, unsigned char **data, int *width, int *height, int *channel_count);

The components R, G, B of the first pixel are the three first values of data unsigned char array. Read the page about how images are stored and the estia-image documentation. Call first_pixel in src/main.c. See the helloworld example to correctly call the function.

if ( strncmp( configuration.command, "first_pixel", 11 ) == 0 ) {
    /* first_pixel() function is defined in feature.h and implemented in feature.c */
    first_pixel();
}