I'm not really familiar with ucblogo, but I looked it up (ref:
Berkeley Logo (UCBLogo)).
It looks like the files don't actually contain image data, but instructions for the ucblogo program to create the image.
I doubt that you'll find an easy way to convert the logo files (*.lg?) to standard image formats, but I think you should be able to do it with a screen capture program. I like to use The Gimp for this kind of thing, but you could probably find a lot of different graphics tools that do this.
You could use the
import command from the previously mentioned
ImageMagick suite. You might even be able to do it in a sequence with the UCBLogo program from a shell script depending on how it's command-line options work.
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-- Ghodmode