explicit -d uint save result: 
uint8.tif            :  128 x  128, 3 channel, uint8 tiff
    tile size: 16 x 16

unmodified copy result: 
tmp.tif              :  128 x  128, 3 channel, uint8 tiff
    tile size: 16 x 16

copy with explicit -d uint16 result: 
copy_uint16.tif      :  128 x  128, 3 channel, uint16 tiff
    tile size: 16 x 16

siappend result: 
tmp.tif              :  128 x  128, 3 channel, uint8 tiff
    tile size: 16 x 16
 subimage  1:  128 x  128, 3 channel, uint16 tiff
    tile size: 16 x 16

combining images result: 
tmp.tif              :  128 x  128, 3 channel, uint8 tiff
    tile size: 16 x 16

Reading green.exr
green.exr            :   64 x   64, 3 channel, half openexr
    SHA-1: 8B61993247469F3C208CA894D71856727B11606A
    channel list: R, G, B
    compression: "zip"
    PixelAspectRatio: 1
    screenWindowCenter: 0, 0
    screenWindowWidth: 1
    oiio:ColorSpace: "Linear"
    oiio:subimages: 1
Reading greenmeta.exr
greenmeta.exr        :   64 x   64, 3 channel, half openexr
    SHA-1: 8B61993247469F3C208CA894D71856727B11606A
    channel list: R, G, B
    compression: "zip"
    eyes: 2
    hair: "brown"
    PixelAspectRatio: 1
    screenWindowCenter: 0, 0
    screenWindowWidth: 1
    weight: 20.5
    oiio:ColorSpace: "Linear"
    oiio:subimages: 1
Reading nometamerge.exr
nometamerge.exr      :   64 x   64, 6 channel, float openexr
    SHA-1: 9F13A523321C66208E90D45F87FA0CD9B370E111
    channel list: R, G, B, A, Z, channel3
    a: 3
    compression: "zip"
    PixelAspectRatio: 1
    screenWindowCenter: 0, 0
    screenWindowWidth: 1
    oiio:ColorSpace: "Linear"
    oiio:subimages: 1
Reading metamerge.exr
metamerge.exr        :   64 x   64, 6 channel, float openexr
    SHA-1: 9F13A523321C66208E90D45F87FA0CD9B370E111
    channel list: R, G, B, A, Z, channel3
    a: 3
    b: 1
    compression: "zip"
    PixelAspectRatio: 1
    screenWindowCenter: 0, 0
    screenWindowWidth: 1
    oiio:ColorSpace: "Linear"
    oiio:subimages: 1
Comparing "crop.tif" and "ref/crop.tif"
PASS
Comparing "cut.tif" and "ref/cut.tif"
PASS
Comparing "pasted.tif" and "ref/pasted.tif"
PASS
Comparing "mosaic.tif" and "ref/mosaic.tif"
PASS
Comparing "mosaicfit.tif" and "ref/mosaicfit.tif"
PASS
Comparing "greenmeta.exr" and "ref/greenmeta.exr"
PASS
Comparing "chappend-3images.exr" and "ref/chappend-3images.exr"
PASS
