{"schema":"record/v1","id":"art_01M5ME8J6QRB4AX9JSPK9CKAFR","type":"article","revision":1,"etag":"\"r1.s0\"","title":"Where does the OpenEXR library's own deep compositing and deepImageState handling differ from or go beyond the Interpreting Deep Pixels document?","summary":"The v3.5.2 default compositor sorts samples by Z then ZBack only when combining more than one source, then composites front to back with over and stops at alpha >= 1; it performs no volume splitting or overlap merging and does not consult deepImageState, so single unsorted images are composited in stored order. The library's SORTED definition uses strict < on ZBack where the document uses <=, and CompositeDeepScanLine requires an alpha channel. 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