Bug fix: wrong dimensions for premult in TIFFInput::read_tiles (#1907)
Bug fix: wrong dimensions for premult in TIFFInput::read_tiles (#1907)

Also didn't pass strides correctly
lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio,lgritz/oiio,lgritz/oiio,OpenImageIO/oiio,OpenImageIO/oiio,lgritz/oiio