Searching for hexahue on Google, we find it is an uncommon way of using colors to represent alphabets. The image given is an extremely horizontally long image, with 5 10x10 square in each column. The first and last square in each column is white.
Using the two scripts I created, I was able to find a message hidden (My first script was half-broken, so I had to change the offset and combine the outputs using the second script)
TTHEE MMESSSAAGEE YYOUU SSEEEK ISS IIHAATEEHEEXAAHUUESSOMMUCCHPPLEEASSEHHELLP
As mentioned earlier, my script was half broken, so we need to remove all the duplicate letters, and we can successfully obtain the flag.
Flag: vsctf{IHATEHEXAHUESOMUCHPLEASEHELP}