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Through /Indexed, samples past the decoded data read as black, so an all-black image could not tell a decoder that stopped after one row from one that decoded all four. A second Group 4 image striped black, white, black, white (horizontal-mode rows, ITU-T T.6 §2.2.3.3) is now rendered through both colour spaces with every /Rows value, and each row is checked for its own colour. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Pq7HyDBXygTf7jcqdsjcfn