BMP 图片和 RGB 值互转

BMP->RGB

#include <iostream>
#include <windows.h>
#include <stdlib.h>

using namespace std;

int main()
{
    FILE *fpBmp;
    BITMAPFILEHEADER bmpHeader;//包含文件类型、大小和布局的信息
    BITMAPINFOHEADER bmpInfHeader;//包含位图的尺寸和颜色格式

    const char *bmpname = "F://share//1.bmp";
    const char *txtname = "F://share//1.txt";

    if((fpBmp = fopen(bmpname,"rb"))==NULL)//fopen( "D://test.bmp","rb")
    {
        cout<<"the bmp file can not open!"<<endl;
        exit(1);
    }
    //read the BITMAPFILEHEADER
    fread(&bmpHeader,sizeof(BITMAPFILEHEADER),1,fpBmp);

    //read the BITMAPINFOHEADER
    fread(&bmpInfHeader,sizeof(BITMAPINFOHEADER),1,fpBmp);

    // read bmp data
    unsigned char *bmpData = new unsigned char[bmpInfHeader.biHeight*bmpInfHeader.biWidth*3];
        //unsigned char *bmpData = new unsigned char[bmpInfHeader.biHeight*bmpInfHeader.biWidth];//黑白图像
    fseek(fpBmp,bmpHeader.bfOffBits,SEEK_SET);
    fread(bmpData,1,bmpInfHeader.biHeight*bmpInfHeader.biWidth*3,fpBmp);
        //fread(bmpData,1,bmpInfHeader.biHeight*bmpInfHeader.biWidth,fpBmp);//黑白图像

    FILE *temp;
    if((temp = fopen(txtname,"wb"))==NULL)//写TXT文件
    {
        cout<<"the file can not be built!"<<endl;
        exit(1);
    }

      for(int i = 0;i<bmpInfHeader.biHeight;i++)
      {
        for(int j = 0;j<bmpInfHeader.biWidth;j++)
        {
            fprintf(temp,"(" );
            fprintf(temp,"%d,",bmpData[i*bmpInfHeader.biWidth*3 + j*3]);
            fprintf(temp,"%d,",bmpData[i*bmpInfHeader.biWidth*3 + j*3+1]);
            fprintf(temp,"%d",bmpData[i*bmpInfHeader.biWidth*3 + j*3+2]);
            fprintf(temp,")\n" );
                        //fprintf(temp,"%d ",bmpData[i*bmpInfHeader.biWidth + j]);//黑白图像
        }
      }

    fclose(fpBmp);
    fclose(temp);
    
    return 0;
}

RGB->BMP

from PIL import Image

x = 300    #x坐标  通过对txt里的行数进行整数分
y = 300    #y坐标  x * y = 行数
im = Image.new("RGB", (x, y))
file = open('1.txt')
for i in range(0, x):
    for j in range(0, y):
        line = file.readline()  #获取一行的rgb值
        line = line[:-2]
        line = line[1:]
        print (line)
        rgb = line.split(",")  #分离rgb，文本中逗号后面有空格
        im.putpixel((i, j), (int(rgb[0]), int(rgb[1]), int(rgb[2])))
im.save('1.bmp')

举个栗子

还原前1.bmp（像素300×300）

生成的1.txt（90000行像素点）

(0,0,0)
(0,0,0)
(0,0,0)
...
...
...
(43,43,43)
(43,43,43)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(0,0,0)
(255,170,85)
(255,255,255)
(255,255,255)
...
...
...
(0,0,0)
(0,0,0)
(0,0,0)

还原后1.bmp（顺时针旋转了90度）