png_metadata.py

png_metadata.py is implemented using Pillow

Supported features

• Support for reading/writing 'tEXt' and 'zTXt' chunks of PNG files.

• Support command line interface.

• Support import png_metadata in Python.
  • add_metadata, remove_metadata, clear_metadata, print_metadata functions are provided.
  • It can be used if the import path matches properly.

Requirements

• Python3

• Pillow

Limitations

• 'iTXt' editing and function to insert special cid chunk are not provided.
  • If you need that function, you can implement it through PIL.PngImagePlugin.PngInfo

Why did i make this?

Using 'ExifTool' is very difficult. Putting the 'tEXt' chunks of PNG directly into ExifTool requires very specialized knowledge and tool skills.

I couldn't find a way to properly edit 'tEXt' even in a graphics tool like GIMP.

In the end, I found it easy to programmatically insert the 'tEXt' value into the PNG using the python3 + Pillow combination.