Transparent

Allowing light to pass through so that objects can be clearly seen on the other side; the opposite of opaque. Window glass, cellophane and watercolors are usually transparent. It is quite possible for one person to describe something as translucent if it is merely tinted, and for another to describe it as transparent because it is so easy to see through it clearly. Portions of GIFs and other digital images are transparent when image layers "behind" others are allowed to be seen without modification. The photo of tracing paper above is an example of a "transparent GIF."