to downsize a picture  (and i'm not sure what size you want (yet)open it in paintshop pro   get that at  
www.jasc.com  trial free
   and open the particular picture   then  hit  image   resize!
  if  your picture is to dark or the contrast needs adjustment
and or you need a gamma reduction  (glare)  you can do that too.
   you can buy  paint shop pro at any good computer retail outlet.
and  its worth the price  or i aint a fisherman.
    later,   Raven-ob1