Everything you need is above..
The plaintext is
Stop Mask ... half excuses to wear undestand a half ... . Real is rare. Take it off. Don't be careless put it on. It is a lie. What to be skeptical? But a dye. Clear perceptible. Removed. Preserve. Once. A soul. Cry. Home.
Only take the cells of the 13x13 grid if
(xy % 2 + xy % 3) % 2 == 0, where
yare the column/row values of the 13x13 grid. This is clued by the XOR-mask in the lower half of the picture. Then, convert the given RGB values to ASCII. This gives us:
The key you need is above.., Etgz Yaku ... tadp qxueeek da wwkd ufnqslkzd s rmlx ... . Bqad se rsbq. Tsuq il yrf. Vyz't to oajoxekc bul sf of. Sf ik k xiw. Gtal da bw cwehducsv? Nul k pyw. Mxesb bejmqplsnlw. Bqmgfqd. Hbqswbhe. Gxoe. S caud. Mdy. Zyye.
Then apply a Vigenere cipher with the key "mask" on the ciphertext part of the message and you get the plaintext above.
Not sure if there's anything more to the puzzle, as the plaintext itself looks pretty cryptic.