void add::addGreyImage(image &src, image &addition, image &tgt, ROI roi, int chan){
//images must be same size??? (assume it I guess)
//tgt.resize(src.getNumberOfRows(), src.getNumberOfColumns());
tgt.copyImage(src);
for (int i=0; i<src.getNumberOfRows(); i++){
for (int j=0; j<src.getNumberOfColumns(); j++){
if (roi.InROI(i,j)){
tgt.setPixel(i,j,chan,src.getPixel(i,j) + addition.getPixel(i,j));
//check for values outside range
if (tgt.getPixel(i,j) > 255)
tgt.setPixel(i,j,255);
else if (tgt.getPixel(i,j) < 0)
tgt.setPixel(i,j,0);
}//else{//do nothing
// tgt.setPixel(i,j,src.getPixel(i,j));
//}
}
}
}
