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Frequently Asked Questions

How does Proof determine if a photo is real?

Every photo taken by a real camera passes through five physical stages. Each stage leaves traces in the pixels that are impossible to fake. Our 30+ signals measure each stage independently.

1. Photon capture
Shot noise from light hitting silicon. Physically impossible to synthesize.
2. Bayer demosaic
One color per pixel interpolated into three. Leaves a periodic pattern AI never produces.
3. Analog to digital
Each sensor burns a unique noise fingerprint (PRNU) into every pixel.
4. ISP processing
Apple, Samsung, Google, etc. each process images differently. Distinct artifacts in edges, gradients, and frequencies.
5. JPEG encoding
DCT blocks, quantization tables, and compression stats unique to each device.

AI skips all five. Edits break one or more. Recaptures add their own.

What are the five detectors?

Every image is scored by five independent detectors:

1. AI-Generated
Detects images created or edited by AI tools.
2. Photo-of-Photo
Detects photos taken of screens or prints.
3. Screenshot
Detects direct screen captures.
4. Web-Download
Detects images downloaded from web platforms.
5. Camera-Origin
Checks metadata provenance strength.

Each detector weighs the signals that matter most for that specific image and shows exactly which signals influenced its answer.

Can AI-generated images fool Proof?

AI image generators (ChatGPT, Midjourney, Stable Diffusion, DALL-E) synthesize pixels directly from neural networks. They skip the entire camera pipeline. No sensor noise, no Bayer pattern, no PRNU fingerprint, no hardware JPEG encoder.

Our 30+ physics signals measure what should be there from a real camera. When it's missing, we know. This is fundamentally different from AI detectors that try to recognize "what AI looks like," which breaks every time a new generator comes out.

How is Proof different from other AI detectors?

Most AI detectors use neural networks trained to recognize what AI output "looks like." They break every time a new generator launches. Proof measures the physics fingerprint the camera pipeline leaves in every pixel. Real cameras produce signals that cannot be faked regardless of what AI tool was used.

Every result includes per-image signal contributions showing exactly which signals drove the verdict. No black box.

What file formats are supported?

JPEG, HEIC, PNG, and WebP. All formats are analyzed automatically. Non-JPEG files are normalized while preserving the original file forensics for analysis.

Is my photo stored after analysis?

All uploaded images are automatically deleted after 24 hours. Your data is never sold or shared. If you need an image removed sooner, contact contactus@proofme.ai.