are storyboards necessary for every scene in a movie??? or why exactly draw a storyboard??? give me an example?

Why draw a storyboard? The primary reason is money. Most of the money spent on a movie is during production, when you have everyone on set. Storyboards can help reduce the costs. Film is a visual medium. Storyboards allow the director to visualize the story before production so everyone can see what the setup is in advance. This saves times and more importantly money. For low-budget production, a storyboard may not justify the expense. For multi-million dollar movies, however, it is a cheap investment.

When you storyboard, you storyboard every shot, not just every scene. Again, the goal is to pre-visualize the movie, and to get the DP and the rest of the crew an idea of what the director wants visually before things even begin. Things can always change on the set, but having a good plan never hurts.

Quick and neat is not needed for storyboarding. Some can be VERY rough. The main thing is you capture the feel of the shot.

As for software, Google "storyboard software" and you'll get a long list. Assuming you don't want to Photoshop or its ilk.

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