读取bmp灰度图片并对其进行反转,然后将其保存,写一段c++代码
时间: 2023-06-09 16:02:37 浏览: 82
好的,对于您的问题,您可以使用以下C语言代码来读取BMP灰度图片、进行反转并保存:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#pragma pack(2)
typedef struct {
unsigned short bfType;
unsigned int bfSize;
unsigned short bfReserved1;
unsigned short bfReserved2;
unsigned int bfOffBits;
} BMPFileHeader;
#pragma pack(2)
typedef struct {
unsigned int biSize;
int biWidth;
int biHeight;
unsigned short biPlanes;
unsigned short biBitCount;
unsigned int biCompression;
unsigned int biSizeImage;
int biXPelsPerMeter;
int biYPelsPerMeter;
unsigned int biClrUsed;
unsigned int biClrImportant;
} BMPInfoHeader;
int main()
{
char input_file[] = "input.bmp";
char output_file[] = "output.bmp";
// 读取BMP文件头信息
FILE* fp = fopen(input_file, "rb");
BMPFileHeader file_header;
BMPInfoHeader info_header;
fread(&file_header, sizeof(file_header), 1, fp);
fread(&info_header, sizeof(info_header), 1, fp);
// 判断BMP是否为灰度图
if (info_header.biBitCount != 8)
{
printf("The input BMP is not grayscale.\n");
return 0;
}
// 读取BMP数据
int width = info_header.biWidth;
int height = info_header.biHeight;
unsigned char* data = (unsigned char*)malloc(width * height);
fread(data, 1, width * height, fp);
fclose(fp);
// 反转灰度值
for (int i = 0; i < width * height; i++)
{
data[i] = 255 - data[i];
}
// 保存BMP文件
fp = fopen(output_file, "wb");
fwrite(&file_header, sizeof(file_header), 1, fp);
fwrite(&info_header, sizeof(info_header), 1, fp);
fwrite(data, 1, width * height, fp);
fclose(fp);
free(data);
return 0;
}
```
这段代码首先读取BMP文件头信息,判断是否为灰度图像,然后读取灰度数据并反转灰度值,最后将修改后的图像保存到新的BMP文件中。
希望这段代码可以帮助到您!
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