ImageSpec: allow getattribute("format") to retrieve the data type name (#3247)
ImageSpec: allow getattribute("format") to retrieve the data type name (#3247)


lgritz/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio