Hi,
I don`t know EPICS, but I think, when you can transfer a value to it, your only problem could be a type mismatching. Have a look at what datatypes are necessary for EPICS and transform your image into this type.
Otherwise transfer your pciture in a string or anything else. LabVIEW has a lot of datatransforming vi.
Perhaps it could be helpful, when you always post your VI.
regards