Codefest CTF 2017 - SimplyBlack - Steganography

Problem

Black is not the only black. There are 50 shades of grey.

Flag is 'flag{secret}'.

https://ctf.codefest.tech/data/attachments/SimplyBlack_b0c707a6fdf259e468663cebafb84451.png

Solution

The problem statement hints at colour inversion. Opening the image using StegSolve and applying Colour Inversion(Xor) returns the flag

FLAG: flag{LETHAL}