C语言将一张图片的rgb信息保存本地

以下是C语言将一张图片的RGB信息保存本地的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define BMP_HEADER_SIZE 54

// 读取BMP文件头信息
void read_bmp_header(FILE *file, int *width, int *height, int *data_size) {
    unsigned char header[BMP_HEADER_SIZE];
    fread(header, 1, BMP_HEADER_SIZE, file);
    *width = *(int*)&header[18];
    *height = *(int*)&header[22];
    *data_size = *(int*)&header[34];
}

// 读取BMP图片的RGB数据
void read_bmp_rgb(FILE *file, unsigned char *data, int data_size) {
    fread(data, 1, data_size, file);
}

// 保存RGB数据到本地文件
void save_rgb_to_file(unsigned char *data, int data_size, char *file_path) {
    FILE *file = fopen(file_path, "wb");
    if (file == NULL) {
        printf("Failed to open file for writing.\n");
        return;
    }
    fwrite(data, 1, data_size, file);
    fclose(file);
}

int main() {
    char *file_path = "image.bmp";
    FILE *file = fopen(file_path, "rb");
    if (file == NULL) {
        printf("Failed to open file.\n");
        return 0;
    }

    int width, height, data_size;
    read_bmp_header(file, &width, &height, &data_size);
    printf("Image size: %d x %d, data size: %d\n", width, height, data_size);

    unsigned char *data = (unsigned char*)malloc(data_size);
    read_bmp_rgb(file, data, data_size);
    fclose(file);

    char *output_file_path = "output.rgb";
    save_rgb_to_file(data, data_size, output_file_path);
    printf("RGB data saved to file: %s\n", output_file_path);

    free(data);
    return 0;
}

该示例代码使用了Windows BMP文件格式，并假设图像数据是24位RGB格式。如果需要处理其他格式的图像，请参考相应的格式规范进行修改。