how moving pictures are produced (was: Portraits again)

[ftah3]

No: HPFGUIDX 32583

Rowena Grunnion-Ffitch wrote:
>    It would be interesting to know exactly how the
> moving paintings are produced. Judging by their vast
> number it can't be a particularly arcane or difficult
> spell though presumably artistic as well as magical
> talent is required. Could it be something in the
> paints? Didn't somebody say moving photographs were
> produced by a special developing fluid?

Well, in CoS, Colin Creevy, during one of his requests to take a 
photo of Harry, is all excited at having discovered that if he 
develops the film in a particular potion, the pictures will move; 
later, he shows Harry one of the potion-developed photos (the one in 
which Harry is pleased to see that his photo self is hiding behind 
Lockhart).

I assume that a similar potion is used to make paintings move.  This 
would, to me, explain why some wouldn't necessarily move ~ maybe the 
person who commissioned/painted 'potioned' it for sentimental 
reasons, or *didn't* because it wasn't a favorite/simply didn't want 
it to move.

Mahoney