When you apply a transparency to an object, it appears as though you're applying a fill. However, a transparency is a grayscale bitmap, which acts as a grayscale mask, that you apply on top of the object's current fill. Since a transparency is applied on top of an object, the object's color shows through the transparency. You can use fountain, uniform, texture, and pattern fill types to create your transparency.
Additionally, you can edit transparencies. For example, you can change the fill type or change the level of opacity which is determined by the grayscale level you specify.
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