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@PerleLabs Middle. The Leaning Tower image looks slightly too clean and evenly detailed compared to the others lighting and textures feel a bit more synthetic.

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 lighting is flatter and more uneven, small imperfections in reflections, road texture, and building details feel physically consistent, nothing looks overly enhanced or artificially smooth

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 : The authentic Amalfi Coast photo (right) shows natural lighting, realistic shadows, and consistent coastal details.

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 fur and the tree branch have a smooth, artificial texture, lacking the fine details and imperfections found in real photography.

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 Left is AI-generated. Reason: The left apple has slightly overly smooth lighting and an artificial looking blur in the background, with textures that feel too uniform.

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.

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