SkyTag is the firm that successfully fought Westwood over giant images of a firefighter and the Statue of Liberty put on a Westwood building shortly after 9/11.
The city of Los Angeles banned such signs in 2002.
Lawyers for the companies argue that to allow city officials to prohibit some signs, while allowing others to go up on city buildings or in special zones, is unconstitutional.
However, according to Chief Assistant City Attorney David Michaelson, "it would be wrong for the judge to now give SkyTag carte blanche to put up giant supergraphics long after the city's moratorium against such signs went into effect".
Michaelson added, "it is a lawful ordinance of the city of Los Angeles that no one has challenged in court."
Also opposed to the supergraphics is the Coalition of Ban Billboard Blight.
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