Edging on a spinning logo

[Chris Poisson]

Paul,

Need more info, your logo has an alpha channel I assume? Sounds like it is premultiplied vs. straight, which it should be. Also, assuming you’re doing this in FCP, how are you viewing it? You should be using a proper broadcast monitor or at least a TV.

You might try using the matte choker on it to trim the edge.

Have a wonderful day.

[Joey Burnham]

[Paul Jones] “Errr, not sure, don’t have great knowledge on alpha channels etc”

You need to. Google it.

JPEG does not support alpha channels, and even if the JPEG has no background at all besides for the logo, FCP is probably going to do something weird to the edges.

Do a little research. Then bring your logo into photoshop or whatever, make a .tif or .targa with alpha and bring back into FCP.

If it has a white or back background you could pull a luma key but really you should educate yourself on alpha channels first.

Best,
Joey

[Paul Jones]

Errr, not sure, don’t have great knowledge on alpha channels etc
Its just a jpg of a logo added in the timeline sitting above a white slug
Yes its FCP and the matte choker doesn’t help, it just makes the white of the logo slightly darker so it now doesn’t match the background.
Its the same when I monitor on an external monitor but this is only going to be shown as a quicktime anyway

cheers

[Bret Williams]

He’s not crazy. It’s a bug I run into all the time, and I guarantee you I have extensive knowledge of alpha channels, although there aren’t any involved in this thread.

Take a jpeg on a white bgrnd and place it over a white background. Shrink it back. FCP places a black edge around it. Very very slight. So, forgetting this bug, I always start to crop it. But the black edge moves with the crop. Soften the crop… nope still there. Render it… still there.

Perhaps it is a jpeg thing. Save it as a tiff or something else maybe.