【EasyX】RGB to Gray

code:

#include <graphics.h>
#include <conio.h>

void main()
{
    initgraph(, );
    // 读取图片
    loadimage(NULL, "F:\\暑期软件工程培训\\EasyXGame\\easyx_test\\easyx_test\\test.jpg");
    BeginBatchDraw();

    int c;
    for(int x=; x<; x++)
    for(int y=; y<; y++)
    {
        c = getpixel(x, y);
        int bb = (c & 0xff0000)//;
        int gg = (c&0x00ff00)/;
        int rr = (c&0x0000ff);
        int gray = (rr*+gg*+bb*+)/;
        c = gray**+gray*+gray ;
        putpixel(x, y, c);
    }
    EndBatchDraw();

    getch();
    closegraph();
}