Unable to select "Convert" an image in Disk Utility

I have a USB flash drive formatted with a  "Mac OS Extended (Journaled)" image that I wish to convert to be encrypted
I have found various support pages that say this can be achieved in Disk Utility by selecting the Image and then click the "Convert" Icon.
When I run Disk Utility I can see the drive and image but when I select the image the "Convert" icon remains greyed out so such that I cannot click it.
The Rsize Image icon is also greyed out and it appears that neither of these items are slectable for any of the images on my mac (either internal HD or another external USB hard drive).
Why are these icons greyed out and what needs to happen to allow these to be selected ?
I am running OS 10.7.5

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