Those who use the word "image" when they really mean "photograph" are usually indulging (consciously or more often, unconsciously) in pretentious and high-sounding languange.
Oh, come now. I say 'image' and you infer that I am probably indulging in pretentous an high-sounding language? That assumes a bit much, don't you think? They are nearly the same by most definitions, and to insist that 'it' be referred to in one way rather than the other seems a bit uppity to me.