Actually the only time I want to see the scrollbars is when the image is larger than 300 x 300. That's why I tried to do the optional bit. My thinking is, after reading the replies, that I should probably test the size of my graphic in the subroutine that gets the size, see if it's over my defined limit and build a string of what I want to see as scrollbars rather than use the optional bit. That may be a bit of a kludge, but using -scrollbars => 'osow' makes them both disappear.
There is no emoticon for what I'm feeling now.