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The former user Lukas Rotter has had1 an intriguing profile picture:

Lukas Rotter

This looks like it's some kind of encrypted message! And just to confirm my suspicions, on his profile he says:

By the way, my profile picture is also a little puzzle. You'll get +0 reputation if you solve it!

Now I'm a generous soul, so I'm going to award you at least +25 reputation if you solve it, and I'm sure you'll get more +10's from others too! How's that for a deal?

What is the solution of the puzzle in Lukas Rotter's profile picture?

Note 1: That user has now deleted their account; however, this puzzle is still self-contained and valid.

Note 2: I do not know the solution myself. Obviously Lukas does, so you'll have to ask him for any hints or clues.

Note 3: this isn't the first puzzle I've done like this, by the way ;-)

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    $\begingroup$ What if it's a troll question and there is no solution $\endgroup$ – greenturtle3141 Sep 7 '16 at 0:01
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    $\begingroup$ @greenturtle3141 Then I guess Lukas will owe me a bunch of rep for all the downvotes I'll get :-P $\endgroup$ – Rand al'Thor Sep 7 '16 at 0:02
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    $\begingroup$ I'll sue you for infringing my copyright :P $\endgroup$ – user14478 Sep 7 '16 at 0:38
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    $\begingroup$ @Lukas It's not plagiarism - I've cited my source! :-P $\endgroup$ – Rand al'Thor Sep 7 '16 at 0:39
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    $\begingroup$ @ΈρικΚωνσταντόπουλος 2) Yes, I already knew Lukas was making a joke (given his :P). 3) I was also making a joke (hence my :-P). 1) See above. $\endgroup$ – Rand al'Thor Sep 8 '16 at 11:51
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It's

Hexadeximal encoded ASCII (translated onto RGB color space) for LukasRotter

Because

The colors are, from left to right #4C756B, #617352, #6F7474 and we add 65 and 72 as per the text, giving the full text:

4C 75 6B 61 73 52 6F 74 74 65 72 = LukasRotter

To elaborate, ASCII is a standardized representation of text which assigns a numeric value to 128 different characters.

The RGB color space is an additive color model where we mix red, green, and blue in different proportions (in this case, as fractions of 255) to make any color we desire. These mixtures are commonly written in the form #RRGGBB where RR is the base-16 quantity of red, GG green, and BB blue. I used a color picker browser extension on the image to extract the hexadecimal representations of the colors.

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    $\begingroup$ Guess I need to watch NumberPhile more... $\endgroup$ – EKons Sep 8 '16 at 10:01
  • $\begingroup$ @Έρικ I had not seen the video from which Lukas got the idea, I've just seen this trick a lot. :P $\endgroup$ – Will Sep 8 '16 at 10:04
  • $\begingroup$ Really? Didn't you see it? $\endgroup$ – EKons Sep 8 '16 at 10:05
  • $\begingroup$ @Έρικ Well I have now, but I'm saying it didn't inform my answer. $\endgroup$ – Will Sep 8 '16 at 10:06
  • $\begingroup$ Oh, because I saw it, and I was actually convinced you had seen it before. $\endgroup$ – EKons Sep 8 '16 at 10:08

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