ForgeSpectrum (v3) — AI Generated Image Detection with Reasoning Traces ForgeSpectrum is a multi domain corpus for AI generated / manipulated image detection, annotated by Gemini 2.5 Pro with structured forensic reasoning traces ( / / / / patterns) plus per image attributes and suspicious region notes. v3 — what changed v3 is the cleaned, balanced release: 3 domains : faces, scenes, id cards (docs and scene text removed — see below). id cards rebalanced : real IDs sourced from MIDV 2020 (2,938 genuine passport/ID images: Finnish ID, Latvian passport, Russian internal passport, Slovak ID), raising id cards reals from 94 to 2,913. docs dropped : the synthetic tampered document fakes were lost from source and are not redistributable; only real docs remained, so the domain was removed. scene text dropped : corpus contained no real scene text images (binary task ill posed). Splits ( disjoint v3/ ) Split Images Real Fake Real % : : : : train 67,306 31,992 35,314 47.5% val 8,880 4,179 4,701 47.1% test clean 8,425 4,184 4,241 49.7% test divergent 14,658 3,180 11,478 21.7% (agreement only) test protocol2 5,238 2,913 2,325 55.6% (leave domain out) Split protocol: fakes are generator disjoint…
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