for(int i = 0; i < _greyvect.size();i++){
greylevel.push_back(_greyvect[i]*_maxgreyvalue);
red.push_back(_redvect[i]);
green.push_back(_greenvect[i]);
blue.push_back(_bluevect[i]);
}
for(int i = 0; i < _greyvect.size();i++){
greylevel.push_back(_greyvect[i]*_maxgreyvalue);
red.push_back(_redvect[i]);
green.push_back(_greenvect[i]);
blue.push_back(_bluevect[i]);
}