读取.png的有效位数？

Question

我有一套16位pngs文件，用LabVIEW录制。出于某种原因，我需要改变它们来使用它们。对于这个，我需要有效位的数量。如何使用Python阅读这些内容？在Matlab中，有一种方法叫做imfinfo，它返回有效位。你知道吗

Answer 1

正如@Glen Randers Pehrson所建议的，我只是阅读了sBIT块：

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)