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@PerleLabs Middle because the tower’s details repeat too perfectly and the texture looks slightly unnatural, unlike a real photo.

Alright… this is it. Final Human CAPTCHA challenge 👉👉 We saved the best for last. There are 3 images. Only ONE is AI-generated. Your job is to tell us if it's the one on the Left, Middle, or Right. Submit your guesses by Sat, Feb 28 at 11:59pm UTC. As usual we'll be revealing the answers on Sunday! If you got 3+ right, we’ll share how to claim your reward next week.

@PerleLabs Left The lighting feels more natural than in previous versions, revealing realistic colors and subtle gradients, especially in the sky and on the balloons. Distant balloons appear convincingly real, with atmospheric haze and a sense of depth.

It's the final week of Human CAPTCHA: Round 7 You made it this far… but we’re not going easy on you. One of these is a real photograph of a hot air balloon, the rest is AI-generated. Can you tell which one it is? Respond with Left, Middle, or Right and tell us why below! Submissions close Sat, Feb 28 at 11:59pm UTC. Answers revealed Sunday.

@PerleLabs right: The photo on the right has fairly “flat” and realistic lighting: the car’s shadow connects clearly to the ground, without looking soft or unnaturally smeared

Perle Human CAPTCHA #6 🏎️ One of these sports car photos is real. The other was generated by AI. Comment “left” or “right” with your guess, and tell us why 👀 Submissions close Sat, Feb 21 at 11:59pm UTC. Answers revealed Sunday.

@PerleLabs Right This is because there's natural depth variation in the mountain and buildings and also a slight atmospheric haze in the distance ( which is very common in real coastal photos).

Perle Human CAPTCHA #5 📸 Let’s keep your captcha streaks alive. One of these vacation photos is real, and one was generated by AI. Which one is real? Reply "left" or "right" and explain why ↓ This week's submissions close Sat, Feb 21th at 11:59pm UTC. Both answers will be revealed on Sunday.

@PerleLabs Right The tiger's fur texture has "imperfect" detail: a few tangled hairs, light dust, and uneven light reflections—things that AI often smooths or fakes don't quite match.

Perle Human CAPTCHA #4 It's time to put your human judgement to the test again. One of these images of a tiger is a real photograph, one was generated by AI. Which one is real? Reply "left" or "right" and tell us why ↓ This week's submissions close Sat, Feb 14th at 11:59pm UTC. Both answers will be revealed on Sunday 👀

@PerleLabs Right The orange on the right has more natural lighting, surface texture, and realistic imperfections.

Perle Human CAPTCHA #3 📷 One of these images of fruit is a real photograph, one was generated by AI. Which one is real? Reply "left" or "right" and why 👇 You have until Sat, Feb 14th at 11:59pm UTC. This week's answers will be revealed on Sunday.

@PerleLabs H The reason for this is All the characters on the Japanese and Chinese signboards are complete in strokes, correct in glyphs.There are no common AI generation defects such as distorted characters, garbled code, or missing radicals.

Perle Human CAPTCHA Round 1 Was this photo taken by a real person or generated by AI? 📸 Reply with a letter and tell us why: H = Human A = AI Deadline to submit is Sun, Feb 7th at 11:59pm UTC. It's go time 👇

Think you can outsmart AI? 😏 Perle's Human CAPTCHA is here. > Test your ability to detect AI-generated content > 2 questions every week > Get 3+ correct across 4 weeks to earn an exclusive badge The real AI challenge begins. First challenge below.

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