.. _PNG_files_with_embedded_data:

PNG files with embedded data (png)
==================================

**Extract chemical structure data embedded in PNG image files**

Read Options
~~~~~~~~~~~~ 

-y <additional chunk ID>  *Look also in chunks with specified ID*


Write Options
~~~~~~~~~~~~~ 

-O <format ID>  *Format of embedded text*
-y <additional chunk ID>  *Write to a chunk with specified ID*


