Analyses all opaque pixels (alpha ≥ 128) of a copy with at most 1024 px on the l...
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Analyses all opaque pixels (alpha ≥ 128) of a copy with at most 1024 px on the long side. The histogram uses 8-bit BT.709 luma of the encoded values. A pixel counts as clipped in the highlights when a channel reaches highlight_level (default 250; all channels = blown to white) and as crushed when every channel is at or below shadow_level (default 5).