How to generate pictures in c language
C language image generation steps: 1. Create image header; 2. Allocate pixel buffer; 3. Set pixel color; 4. Write image file.
How to generate images using C language
Steps to generate images:
- Create image header: Contains the basic information of the image, such as width, height and color depth.
- Allocate pixel buffer: A memory area that stores image pixel data.
- Set pixel color: Use a for loop or image processing library to set the color value of a pixel.
- Write image file: Write the image header and pixel buffer to an image file, such as BMP or PNG.
Code example:
Generate a 3x3 blue rectangular image:
#include <stdio.h> int main() { // 定义图像头 struct { char id[2]; // "BM" int filesize; // 文件大小(字节) int reserved; // 保留(0) int offset; // 像素数据的偏移量(字节) int header_size; // 头部大小(字节) int width; // 图像宽度(像素) int height; // 图像高度(像素) short int planes; // 平面数量(1) short int bit_count; // 位深度(24) int compression; // 压缩类型(0) int image_size; // 图像数据大小(字节) int x_resolution; // 水平分辨率(像素/米) int y_resolution; // 垂直分辨率(像素/米) int number_of_colors; // 调色板中的颜色数量(0) int important_colors; // 重要的颜色数量(0) } bmp_header = { {'B', 'M'}, // "BM" sizeof(bmp_header) + 3*3, // 3x3 图像大小 0, // 保留(0) sizeof(bmp_header), // 像素数据的偏移量(字节) 40, // 头部大小(字节) 3, // 图像宽度(像素) 3, // 图像高度(像素) 1, // 平面数量(1) 24, // 位深度(24) 0, // 压缩类型(0) 3*3, // 图像数据大小(字节) 0, // 水平分辨率(像素/米) 0, // 垂直分辨率(像素/米) 0, // 调色板中的颜色数量(0) 0 // 重要的颜色数量(0) }; // 分配像素缓冲区 unsigned char pixels[3*3] = { 0x00, 0x00, 0xFF, // 蓝色 0x00, 0x00, 0xFF, // 蓝色 0x00, 0x00, 0xFF // 蓝色 }; // 打开图像文件 FILE *file = fopen("image.bmp", "wb"); // 写入图像头 fwrite(&bmp_header, sizeof(bmp_header), 1, file); // 写入像素数据 fwrite(pixels, sizeof(pixels), 1, file); // 关闭图像文件 fclose(file); return 0; }
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