閱讀.png有效位的數目？

Question

我有一組16位pngs文件，用LabVIEW錄製。出於某種原因，我需要轉移他們來使用它們。爲此，我需要有效位的數量。我如何閱讀那些使用Python？在Matlab中，有一種方法稱爲imfinfo它返回有效位。

Answer 1

如建議通過@Glen蘭德斯·皮爾遜，我剛讀了SBIT塊：

import struct 
import binascii 

def __header(bytes): 
    return struct.unpack('>NNccccc', bytes) 

def __getSBit(bytes): 
    bytes = bytes[8:] 

    sBit = 0 

    while bytes: 
     length = struct.unpack('>I', bytes[:4])[0] 
     bytes = bytes[4:] 

     chunk_type = bytes[:4] 

     bytes = bytes[4:] 

     chunk_data = bytes[:length] 
     bytes = bytes[length:] 

     if chunk_type == "sBIT": 
      sBit = int(chunk_data.encode("hex"), 16) 
      break 

     bytes = bytes[4:] 

    return sBit 

def getSigniticantBits(filename): 
    with open(filename, 'rb') as f: 
     bytes = f.read() 

    return __getSBit(bytes)