Originally Posted by Droo

Most of the class had it right.
"Yes, to make it simple... muggles process the negatives through some chemicals, then enlarge them onto photographic paper, then pass it through more chemical and then pass it through water. They then hang them until they are dry. And they do all this in a room void of all light, but a red one." She said and dimmed the lights, creating a red hue.
"There are two ways of making a wizard photo, taking a muggle one and animating it with a charm or, using the devomotion potion to pull the actual animation onto the picture." She walked to the front of her desk and sat on it. "When you take a muggle picture the negative captures the exactly split second you take it. So animating it with a charm will only make it do what you want it to, not what actually had happened at the time the picture was taken."
She called up the bags in the corner. "Wizard cameras capture the few seconds leading to the moment the picture is taken, and the few seconds after... only the devomotion potion can put that on photo paper. Now..." she said casting an aguamenti in her cauldron, and then lit a fire under it. "Start with water on a low flame."