convert_format
result = convert_format(result, p->s.img_out_n, req_comp, p->s.img_x, p->s.img_y);
out = convert_format(out, target, req_comp, s->img_x, s->img_y);
out = convert_format(out, 4, req_comp, w, h);
result=convert_format(result,4,req_comp,x,y);
o = convert_format(o, 4, req_comp, g->w, g->h);