Four new extraction research documents covering ICC profile and color
space luminance estimation for text visibility, precise text state
tracking and bounding box computation (Tc/Tw/Tz/TL, font units, TJ
kerning, baseline clustering), PDF/X prepress handling (OutputIntent,
TrimBox, spot colors, article threading), and a complete content stream
operator reference (BT/ET, Tj/TJ/'/", BI/ID/EI, BX/EX, marked content).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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