Hey,
Drag an AI, EPS, or alpha channeled PNG of your logo into the After Effects bin, then onto the New Comp icon. Highlight the clip in the timeline and press R to bring up the rotation settings, clicking the keyframe stopwatch on the rotation parameter you want (I’m assuming you want it on the Y-axis). Advance to the length of time you want the object to rotate one complete revolution, press N to set the end of the comp length, and enter the value 1 under the rotation parameter (where it says 0x). Then, slide that newly created keyframe a single frame past the out point of the comp, and Send to Render Queue. Now, you can set the video clip to loop and it’ll be seamless.
Basically, alpha channels contain information about transparency. Meaning, if the background of a logo is supposed to be transparent, you need to save that transparency in a format that supports transparency, like PNGs, PSDs, TIFFs, and GIFs. JPGs don’t support transparencies. You do this because you can’t exactly save files in non-square formats. Is that clear?
Here’s some additional info, but there are plenty of other resources too. 🙂 Best of luck.
Kind Regards,
Richard
Richard Fleming
Multimedia Specialist
Creative Coop
http://www.creativecoop.co