If your HD images are destined to end up on film, the HDTV Masks plug-in aids you in determining the portion of the HDTV frame that will be projected on film by adding reticles and or a variable opacity mask to the image. The following aspect ratio’s are supported: 1:85 and the TV Transmitted Area, Safe Action and Safe Title for NTSC video. HDTV Masks are not available for Avid Editing Systems.