The difference between a photograph and a painting.

I was asked to give a talk at the local Photographic Society on the subject "the difference between a photograph and a painting".   This was my attempt at answering!
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If we take the subject of landscape, before the making of the image can begin – be it by clicking the shutter or stretching the canvas and wielding the paintbrush – one has to SEE THE POTENTIAL OF THE SUBJECT.  I think ones eye becomes trained to do this.  I remember when I first started sketching I used a piece of card with a square cut out to focus on an area of landscape the total scene before me was just to overwhelming.  The viewfinder on a camera also does this of course.
While the image is being captured on a camera or sketchbook, all the aspects of mood, weather etc  have gone into ones brain with the image.  This is so different to using an image from a postcard or one taken off the computer screen which you haven’t EXPERIENCED. 
A painting then allows the artist to retain all the essential features of the subject and leave out the rest, in order to create a UNIQUE VISION!