No it works good with:
if(!r_img.Create(w,h)){return -1;}
r_img.Clear(sf::Color(0,0,0,0));
c_img00=r_img.GetImage();
img.Copy(c_img00,0,0,rct,true);
But I'm doing image processing so I was curious if there was a speedy way to avoid sf::Image::Copy()
I suppose the only faster way is with a GetPixelsPtr right?