c++图像处理:24位真彩图颜色变换实例

#include<iostream>#include<Windows.h>using namespace std;bool isred(BYTE r,BYTE g,byte b){	if(r>g&&r>b) return true;	else return false;}void red2green(BYTE& r,BYTE& g,BYTE& b){	BYTE tmp=r;	r=g;	g=tmp;}int main(){	FILE *fpin=fopen("flo.bmp","rb+");	if(fpin==NULL){		cout<<"目录里没有输入图"<<endl;		system("pause");		return 0;	}	BITMAPFILEHEADER bitmapfileheader;	BITMAPINFOHEADER bitmapinfoheader;	fread(&bitmapfileheader,sizeof(bitmapfileheader),1,fpin);	fread(&bitmapinfoheader,sizeof(bitmapinfoheader),1,fpin);	if(bitmapfileheader.bfType!='B'+'M'*256){		cout<<"不是bmp格式"<<endl;		fclose(fpin);		system("pause");		return 0;	}	if(bitmapinfoheader.biBitCount!=24){		cout<<"不是24位bmp"<<endl;		fclose(fpin);		system("pause");		return 0;	}	//设置fpout	FILE *fpout=fopen("output.bmp","wb+");	//BITMAPFILEHEADER bitmapfileheader2;	//BITMAPINFOHEADER bitmapinfoheader2;	//bitmapfileheader2=bitmapfileheader;	//bitmapinfoheader2=bitmapinfoheader;	fwrite(&bitmapfileheader,sizeof(bitmapfileheader),1,fpout);	fwrite(&bitmapinfoheader,sizeof(bitmapinfoheader),1,fpout);	if(bitmapinfoheader.biClrUsed!=0){		cout<<"是索引图"<<endl;		system("pause");		return 0;	}	if(bitmapinfoheader.biBitCount==24){		cout<<"24位真彩图"<<endl;		//int line_width=((bitmapinfoheader.biWidth*bitmapinfoheader.biBitCount+24)/32)*4;		int line_width=bitmapinfoheader.biWidth*3;		BYTE *line_buf=new BYTE[line_width];		for(int i=0;i<bitmapinfoheader.biHeight;i++){			fread(line_buf,line_width,1,fpin);						for(int j=0;j<bitmapinfoheader.biWidth;j++){				BYTE b=line_buf[3*j];				BYTE g=line_buf[3*j+1];				BYTE r=line_buf[3*j+2];				if(isred(r,g,b)){					red2green(line_buf[3*j+2],line_buf[3*j+1],line_buf[3*j]);				}			}				fwrite(line_buf,line_width,1,fpout);		}		fclose(fpin);		fclose(fpout);		delete []line_buf;		cout<<"红变绿完成"<<endl;	}		system("pause");	return 0;}