i am sorry if i wasnt clear, let me try again…
i usually export my edited material as an image sequence (.SGI precisely)since my original material is anamorphic (widescreen) when i edit for NTSC the format has bars.
usually FCP allows me to export each frame as it is. with bars, but lately the exported files have no bars, instead the space is black and when i import it to some other program, this space is recognized as an alpha channel. thnx, and sorry if i mixed up