Zima Blue

The mysterious artist Zima has unveiled his latest piece, and once again, it features his signature shade of blue. I honestly don't get it. Is he hiding a message in his art somehow?

Solution

To solve this challange, I use Gimp and played around with the with tools in the Colors tab. Im not exactly sure which tools did i use but it's not that complicated. The flag is shown in the middle down part of the cyan box.

flag : flag{t3ll_by_th3_p1x3ls}

Original writeup (https://github.com/ilhamhanifan/ctf_writeup/blob/main/b01lers2020-MISC.md).