What kind of paint should I use when painting a large mural used for photography?

I have been contracted (by family) to paint a large mural on a wall (finished drywall, no texture, primed) which will be used as a background in a portrait studio. I am not sure what kind of paint I should use...I know regular acrylics are out the window--too expensive for this scale, gloss latex wall paint will glare in the photograph, and I am unfamiliar with spray paint. The best guess I have is flat wall paint. Any suggestions?What kind of paint should I use when painting a large mural used for photography?
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http://www.spicyexpress.net/tag/paintWhat kind of paint should I use when painting a large mural used for photography?
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Karl
Definitely Flat Wall Paint- water based/acrylic. Many Lowe's stores have mistints in their department- they're marked down.