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@tynan
HDR = high dynamic range.
hand-rendering = doing it by hand, or rather doing it in something like photoshop by painting through the various exposures.
Basically:
take a picture and expose it for the shadows (blows out the highlights)
take a picture and expose it for the midtones.
take a picture and expose it for the highlights (fills in the shadows)
(this example is three exposure but you could do as many as you like)
Then using a photo editor like Photoshop either automatically get it to produce a HDR image with detail in the highlights and the shadows - or do it 'by hand' by masking and deleting between the various exposures.