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  • Thanks John, it was a little bit hard to understand how the png encoder works, but I think I got the idea. Very good answer. Commented Mar 18, 2017 at 18:04
  • 1
    I found the explanation about the dpi/ppi here: sites.google.com/site/dtcsinformation/data-representation/… , if someone is interested.. Commented Mar 18, 2017 at 18:14