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LeoHsiao1 avatar LeoHsiao1 commented on July 23, 2024
  1. 你的 PNG 图片本来有元数据吗？
  2. 给这个 PNG 写入元数据，可以再读取到吗？

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helinxuan avatar helinxuan commented on July 23, 2024

你好png图片我设置了拍照日期，尝试了所有的read方法，打印出来都是空的，我用同样的方法修改jpg就可以读取并修改成功
image

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LeoHsiao1 avatar LeoHsiao1 commented on July 23, 2024

可以把你这张图片压缩之后发我邮箱试试吗？
或者你尝试写入元数据，再读取

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helinxuan avatar helinxuan commented on July 23, 2024

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helinxuan avatar helinxuan commented on July 23, 2024

好的已经发你邮箱了，我尝试了写入后读取，可以读出来，但是在电脑上看拍摄日期并没有被改动

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LeoHsiao1 avatar LeoHsiao1 commented on July 23, 2024

我没有收到，请做成压缩包之后发到这个邮箱：
[email protected]

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LeoHsiao1 avatar LeoHsiao1 commented on July 23, 2024

我尝试读取这张 PNG 图片，它存在 XMP 元数据：

>>> img = pyexiv2.Image(r"C:\Users\Leo\Desktop\2014-09-28 153216.png")
>>> img.read_exif()
{}
>>> img.read_iptc()
{}
>>> img.read_xmp()
{'Xmp.xmp.CreateDate': '9119-06-23T19:45:17.834'}

然后我用 exiftool 查看其数据结构，如下：

leo@Leo:/$ exiftool -v "2014-09-28 153216.png"
  ExifToolVersion = 12.29
  FileName = 2014-09-28 153216.png
  Directory = .
...
PNG pHYs (9 bytes):
  + [BinaryData directory, 9 bytes]
  | PixelsPerUnitX = 3779
  | PixelsPerUnitY = 3779
  | PixelUnits = 1
PNG tEXt (33 bytes):
  CreationTime = 1997:07:15 18:46:52
PNG IDAT (9 chunks, total 549509 bytes)
PNG IEND (end of image)

可见它没有其它符合 EXIF、IPTC、XMP 规范的元数据，只有一个 PNG tEXt 字段记录了拍摄日期。

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helinxuan avatar helinxuan commented on July 23, 2024

感谢解答，我尝试把图片转化成jpg格式就可以了

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