if I understand correctly, the image is displayed correctly in the table control, so displaying it from there in a image field should be as simple as:
MyImageField = MyTable.ImageColumn[SelectedLine]
How you find which column, it's name, and which line is too dependant of your code to say...
If you don't know in advance the column name, then you will have to use the indirection to construct the name in a string and use it at the right time with something looking like this
MyImageField = {"MyTable.ImageColumn",indcontrol}[SelectedLine]
or
MyControlName is string = "MyTable.ImageColumn"
MyImageField = {MyControlName,indcontrol}[SelectedLine]