24位图转1位图C++代码实现
时间: 2023-05-28 11:05:10 浏览: 58
以下是一个基本的24位图转1位图的C代码实现:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
if (argc < 3) {
printf("Usage: %s input.bmp output.bmp\n", argv[0]);
return 1;
}
char *in_filename = argv[1];
char *out_filename = argv[2];
FILE *in_file = fopen(in_filename, "rb");
if (!in_file) {
printf("Error: could not open input file.\n");
return 1;
}
FILE *out_file = fopen(out_filename, "wb");
if (!out_file) {
printf("Error: could not open output file.\n");
fclose(in_file);
return 1;
}
// Read file headers
unsigned char bmp_header[54];
fread(bmp_header, sizeof(unsigned char), 54, in_file);
// Make sure file is a 24-bit bmp
if (bmp_header[0] != 'B' || bmp_header[1] != 'M' || *(int*)&(bmp_header[0x1E]) != 0 || *(int*)&(bmp_header[0x1C]) != 24) {
printf("Error: input file is not a 24-bit BMP.\n");
fclose(in_file);
fclose(out_file);
return 1;
}
// Write file headers to output file
fwrite(bmp_header, sizeof(unsigned char), 54, out_file);
int width = *(int*)&(bmp_header[0x12]);
int height = *(int*)&(bmp_header[0x16]);
// Allocate memory for pixel data
unsigned char *data = (unsigned char*)malloc(width * height * 3 * sizeof(unsigned char));
unsigned char *new_data = (unsigned char*)malloc(width * height * sizeof(unsigned char));
// Read pixel data
fread(data, sizeof(unsigned char), width * height * 3, in_file);
// Convert to 1-bit image
int i, j;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
int offset = i * width * 3 + j * 3;
unsigned char r = data[offset];
unsigned char g = data[offset + 1];
unsigned char b = data[offset + 2];
// Convert to grayscale
unsigned char gray = (unsigned char)(0.299 * r + 0.587 * g + 0.114 * b);
// Set new pixel value
int new_offset = i * width + j;
if (gray >= 128) {
new_data[new_offset] = 255; // White
} else {
new_data[new_offset] = 0; // Black
}
}
}
// Write new pixel data to output file
fwrite(new_data, sizeof(unsigned char), width * height, out_file);
// Free memory
free(data);
free(new_data);
// Close files
fclose(in_file);
fclose(out_file);
printf("Done.\n");
return 0;
}
```
这个程序假定输入文件是一个24位BMP图像,并将其转换为一个1位BMP图像。它还假定输入文件的文件头是54个字节长,并且没有包含调色板数据。如果你的文件不符合这些要求,你需要对代码进行适当的修改。
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