How do I create an unreferenced image?

[Graham Samuel]

Folks, I may have asked this before, but if so I can't find any record.

An image object in RR can either refer to an external file containing 
the actual graphic content (for example a GIF), or - via the IDE- the 
image can be embedded and thus freed from the external file at the 
cost of making the stack file a bit bigger.

My question is, how does the IDE do this trick of embedding and 
getting rid of the external reference? I would like to create such 
images myself by scripting, but I don't see how. Sorry if this is 
obvious.

TIA

Graham
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          Graham Samuel / The Living Fossil Co. / UK & France