This property determines the transparency of the rendered image. It allows you to change the image transparency without directly modifying the rendered object. A value of 0 is completely opaque, and a value of 1 is completely transparent (invisible). The default transparency is 0.
This property behaves similarly to
BasePart/Transparency except that it is applied to the rendered image.
The image below demonstrates the same ViewportFrame with two different transparency. The first image has a transparency of 0 and the second image has a transparency of 0.5.
articles/ViewportFrame GUI|ViewportFrame-GUI, an article exploring how the ViewportFrame GUI can render 3D objects inside its bounds
ViewportFrame/ImageColor3, determines how a rendered image will be colorized
Camerathat is used to render children objects