Python读取图片属性信息的实现方法_程序人生

Python读取图片属性信息的实现方法

admin

2023-08-01 20:03:04

0次

本文是利用Python脚本读取图片信息，有几个说明如下：

1、没有实现错误处理

2、没有读取所有信息，大概只有 GPS 信息、图片分辨率、图片像素、设备商、拍摄设备等

3、简单修改后应该能实现暴力修改图片的 GPS 信息

4、但对于本身没有 GPS 信息的图片，实现则非常复杂，需要仔细计算每个描述符的偏移量

脚本运行后，读取结果如下

脚本读取的信息

这里和 Windows 属性查看器读到的内容完全一致

图片信息1

图片信息2

源码如下

# -*- coding:utf-8 -*-
import binascii

class ParseMethod(object):
  @staticmethod
  def parse_default(f, count, offset):
    pass

  @staticmethod
  def parse_latitude(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)

    latitude = [0,0,0]
    for i in xrange(count):
      byte = f.read(4)
      numerator = byte.encode(\'hex\')

      byte = f.read(4)
      denominator = byte.encode(\'hex\')

      latitude[i] = float(int(numerator, 16)) / int(denominator, 16)


    print \'Latitude:\\t%.2f %.2f\\\' %.2f\\\"\' % (latitude[0], latitude[1], latitude[2])
    f.seek(old_pos)  


  @staticmethod
  def parse_longtitude(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)

    longtitude = [0,0,0]
    for i in xrange(count):
      byte = f.read(4)
      numerator = byte.encode(\'hex\')

      byte = f.read(4)
      denominator = byte.encode(\'hex\')

      longtitude[i] = float(int(numerator, 16)) / int(denominator, 16)


    print \'Longtitude:\\t%.2f %.2f\\\' %.2f\\\"\' % (longtitude[0], longtitude[1], longtitude[2])
    f.seek(old_pos) 

  @staticmethod
  def parse_make(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)
    byte = f.read(count)
    a = byte.encode(\'hex\')
    print \'Make:\\t\\t\' + binascii.a2b_hex(a)
    f.seek(old_pos) 

  @staticmethod
  def parse_model(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)
    byte = f.read(count)
    a = byte.encode(\'hex\')
    print \'Model:\\t\\t\' + binascii.a2b_hex(a)
    f.seek(old_pos)     

  @staticmethod
  def parse_datetime(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)
    byte = f.read(count)
    a = byte.encode(\'hex\')
    print \'DateTime:\\t\' + binascii.a2b_hex(a)
    f.seek(old_pos)

  # rational data type, 05
  @staticmethod
  def parse_xresolution(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)

    byte = f.read(4)
    numerator = byte.encode(\'hex\')
    byte = f.read(4)
    denominator = byte.encode(\'hex\')
    xre = int(numerator, 16) / int(denominator, 16)

    print \'XResolution:\\t\' + str(xre) + \' dpi\'
    f.seek(old_pos)

  @staticmethod
  def parse_yresolution(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)

    byte = f.read(4)
    numerator = byte.encode(\'hex\')
    byte = f.read(4)
    denominator = byte.encode(\'hex\')
    xre = int(numerator, 16) / int(denominator, 16)

    print \'YResolution:\\t\' + str(xre) + \' dpi\'
    f.seek(old_pos)

  @staticmethod
  def parse_exif_ifd(f, count, offset):
    old_pos = f.tell()
    f.seek(12 + offset)

    byte = f.read(2)
    a = byte.encode(\'hex\')    
    exif_ifd_number = int(a, 16)

    for i in xrange(exif_ifd_number):
      byte = f.read(2)
      tag_id = byte.encode(\'hex\')
      #print tag_id,

      byte = f.read(2)
      type_n = byte.encode(\'hex\')
      #print type_n,

      byte = f.read(4)
      count = byte.encode(\'hex\')
      #print count,

      byte = f.read(4)
      value_offset = byte.encode(\'hex\')
      #print value_offset

      value_offset = int(value_offset, 16)
      EXIF_IFD_DICT.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)

    f.seek(old_pos)  

  @staticmethod
  def parse_x_pixel(f, count, value):
    print \'X Pixels:\\t\' + str(value)

  @staticmethod
  def parse_y_pixel(f, count, value):
    print \'y Pixels:\\t\' + str(value)

  @staticmethod
  def parse_gps_ifd(f, count, offset):
    old_pos = f.tell()    
    f.seek(12 + offset)
    byte = f.read(2)
    a = byte.encode(\'hex\')  
    gps_ifd_number = int(a, 16)

    for i in xrange(gps_ifd_number):
      byte = f.read(2)
      tag_id = byte.encode(\'hex\')
      #print tag_id,

      byte = f.read(2)
      type_n = byte.encode(\'hex\')
      #print type_n,

      byte = f.read(4)
      count = byte.encode(\'hex\')
      #print count,

      byte = f.read(4)
      value_offset = byte.encode(\'hex\')
      #print value_offset

      count = int(count, 16)
      value_offset = int(value_offset, 16)
      GPS_IFD_DICT.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)

    f.seek(old_pos) 

IFD_dict = {
  \'010f\' : ParseMethod.parse_make ,
  \'0110\' : ParseMethod.parse_model ,
  \'0132\' : ParseMethod.parse_datetime ,
  \'011a\' : ParseMethod.parse_xresolution ,
  \'011b\' : ParseMethod.parse_yresolution ,
  \'8769\' : ParseMethod.parse_exif_ifd ,
  \'8825\' : ParseMethod.parse_gps_ifd
}

EXIF_IFD_DICT = {
  \'a002\' : ParseMethod.parse_x_pixel ,
  \'a003\' : ParseMethod.parse_y_pixel
}

GPS_IFD_DICT = {
  \'0002\' : ParseMethod.parse_latitude ,
  \'0004\' : ParseMethod.parse_longtitude
}


with open(\'image.jpg\', \'rb\') as f:
  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'SOI Marker:\\t\' + a

  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'APP1 Marker:\\t\' + a

  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'APP1 Length:\\t\' + str(int(a, 16)) + \' .Dec\'

  byte = f.read(4)
  a = byte.encode(\'hex\')
  print \'Identifier:\\t\' + binascii.a2b_hex(a)

  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'Pad:\\t\\t\' + a 

  print 

  print \'Begin to print Header.... \'
  print \'APP1 Body: \'

  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'Byte Order:\\t\' + a  

  byte = f.read(2)
  a = byte.encode(\'hex\')
  print \'42:\\t\\t\' + a 

  byte = f.read(4)
  a = byte.encode(\'hex\')
  print \'0th IFD Offset:\\t\' + a 

  print \'Finish print Header\'

  print \'Begin to print 0th IFD....\'
  print
  #print \'Total: \',
  byte = f.read(2)
  a = byte.encode(\'hex\')
  interoperability_number = int(a, 16)
  #print interoperability_number


  for i in xrange(interoperability_number):
    byte = f.read(2)
    tag_id = byte.encode(\'hex\')
    #print tag_id,

    byte = f.read(2)
    type_n = byte.encode(\'hex\')
    #print type_n,

    byte = f.read(4)
    count = byte.encode(\'hex\')
    #print count,

    byte = f.read(4)
    value_offset = byte.encode(\'hex\')
    #print value_offset

    count = int(count, 16)
    value_offset = int(value_offset, 16)

    # simulate switch
    IFD_dict.get(tag_id, ParseMethod.parse_default)(f, count, value_offset)


  print
  print \'Finish print 0th IFD....\'

总结

利用Python读取图片属性信息的实现方法到这就基本结束了，大家都学会了吗？希望这篇文章对大家的学习或者工作带来一定的帮助，

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