The most noticeable difference is the blackness of the background that steel provides. This is because the light is being totally blocked out by the steel, as opposed to the transparency, which is not as dense as the steel, and is showing a bleed through of light. The difficulty in printing your own transparency gobos is getting the background black enough.Some people will show you a gobo projector projecting a gobo with a clear background, but this is not often requested, as it tends to bleach out the gobo image.
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