Hint with Not Art - stego

HTB Content Challenges
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1

I have tried stego tools but cannot find any thing useful.Try to get the color of the whole pixel but also find nothing.Can anyone give me some hints?

2

Have a look in the Not Art thread in this section: Any hint for not_art - Challenges - Hack The Box :: Forums

3

I had tried npiet not_art.png

But failed…

What I am missing…

Hack The Box