Extract only one file type with binwalk

Question

I have a very heavy file and with binwalk I have to extract only one file type (png) and obviously given the size of the file I can not extract all.
I tried to do binwalk -D 'png image:png' [filename] but continue to extract all files. How can I make binwalk extract only the files I want?

Answer 1

You just have to use --rm :

binwalk --dd='png image:png:' [filename] --rm

Empty files will still be created but you can just ignore / delete them.