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The compressed RW2 layouts of earlier Lumix bodies (e.g. the DMC-GX7) decode at full sensor resolution instead of falling back to the camera's embedded JPEG preview. The layout was established by observation of sample files (fixed 16 bytes per 14 pixels, predictor groups with per-parity predictors, page-permuted downward bit order); the black level of these files reads 15 counts low. Adds round-trip tests through a mirrored synthetic encoder, cursor and predictor-group unit vectors, and updates the support matrix. Co-authored-by: Gotya-OFFCIAL <339410022+Gotya-OFFCIAL@users.noreply.github.com>