#include int main(){ Img8u a(Size(1,40),2); for(int i=0;i<40;++i){ a(0,i,0) = 255; } for(int i=0;i<20;++i){ a(0,i,1) = 200; a(0,i+20,1) = 240; } a(0,0,1) = 180; a(0,19,1) = 180; a(0,20,1) = 180; a(0,39,1) = 180; save(a,"test.png"); }