def test_dpx(h, f):
    """DPX (Digital Picture Exchange)"""
    import struct
    if len(h) < 1664:
	    return None
    if	h[:4]=="SDPX":
	    endianess = '>'
    elif h[:4]=="XPDS":
	    endianess = '<'
    else:
	    return None
    raw_info = struct.unpack(endianess+"hll", h[770:780])
    if 0<raw_info[0]<9 and raw_info[1]>0 and raw_info[2]>0:
	    return 'dpx'

tests.append(test_dpx)

def test_cin(h, f):
    """Kodak Cineon for digital film images"""
    import struct
    if len(h) < 508 or h[:4]!='\x80\x2A\x5F\xD7' or not 0<ord(h[193])<9:
        return None
    raw_info = struct.unpack(">ll", h[99:107])
    if raw_info[0]>0 and raw_info[1]>0:
        return 'cin'

tests.append(test_cin)