{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:EM3RGHKDMSWJS2M2XPK6YFPOL5","short_pith_number":"pith:EM3RGHKD","canonical_record":{"source":{"id":"1412.3220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-12-10T07:47:51Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"0f1c020ed378de7c9a4a348aa89fc34e4f18bdf38085f5339684b5560d7a1228","abstract_canon_sha256":"cadf00960efe63694a8395861c4135d0af4957074352ea9047ebbf798560d3ed"},"schema_version":"1.0"},"canonical_sha256":"2337131d4364ac99699abbd5ec15ee5f76da4182757442fc1e092e07b8cad568","source":{"kind":"arxiv","id":"1412.3220","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.3220","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"arxiv_version","alias_value":"1412.3220v1","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.3220","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"pith_short_12","alias_value":"EM3RGHKDMSWJ","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"EM3RGHKDMSWJS2M2","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"EM3RGHKD","created_at":"2026-05-18T12:28:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:EM3RGHKDMSWJS2M2XPK6YFPOL5","target":"record","payload":{"canonical_record":{"source":{"id":"1412.3220","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-12-10T07:47:51Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"0f1c020ed378de7c9a4a348aa89fc34e4f18bdf38085f5339684b5560d7a1228","abstract_canon_sha256":"cadf00960efe63694a8395861c4135d0af4957074352ea9047ebbf798560d3ed"},"schema_version":"1.0"},"canonical_sha256":"2337131d4364ac99699abbd5ec15ee5f76da4182757442fc1e092e07b8cad568","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:31:37.220380Z","signature_b64":"UHvAGnJULtj6p8xnHC/sD+Y5cCtlnxm9BkHEEvvn65hpyScrOo+9ZEeZpRR4heqL/txfQC4UgUNgY/c3hj4UBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2337131d4364ac99699abbd5ec15ee5f76da4182757442fc1e092e07b8cad568","last_reissued_at":"2026-05-18T02:31:37.219730Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:31:37.219730Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1412.3220","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:31:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PKvhzSDCqZNpZe8+tbnhmSsJQ1HUJ4HSN+T02j6nr5hIeNvB243NBD1ST/nvHTowfsaUdYXrb0NjeVQGYFYQCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T09:12:58.666197Z"},"content_sha256":"78cb274eb96a783080c63b9ec8f2266efaaeb54a4bbb5584748f94bdb08a2ef1","schema_version":"1.0","event_id":"sha256:78cb274eb96a783080c63b9ec8f2266efaaeb54a4bbb5584748f94bdb08a2ef1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:EM3RGHKDMSWJS2M2XPK6YFPOL5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An empirical-parametric gamma calibration algorithm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.data-an"],"primary_cat":"physics.optics","authors_text":"Jani Isohanni, Robert Piche","submitted_at":"2014-12-10T07:47:51Z","abstract_excerpt":"A method to determine the gamma correction curves for displays is presented. An empirical model is first constructed from exhaustive measurements of a few representative units. The model parameters for the remaining units are then fitted using only a few measurements. The method uses standard least-squares algorithms and is computationally light. Experimental results for a small sample of LCD displays are presented."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.3220","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:31:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sRgBh5yIZh5vAO41tnCEJI2wvbeFz8GIjWyih2Jn8v52fBgPNR/UfHPEgZ1QPzzPfM137vKZhc1Lm+UVdJ9tAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T09:12:58.666559Z"},"content_sha256":"f3537f69cf19aff7f1465436122effc3d7e2645e12dfd0584f78bd37a79d85b8","schema_version":"1.0","event_id":"sha256:f3537f69cf19aff7f1465436122effc3d7e2645e12dfd0584f78bd37a79d85b8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/bundle.json","state_url":"https://pith.science/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T09:12:58Z","links":{"resolver":"https://pith.science/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5","bundle":"https://pith.science/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/bundle.json","state":"https://pith.science/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EM3RGHKDMSWJS2M2XPK6YFPOL5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:EM3RGHKDMSWJS2M2XPK6YFPOL5","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"cadf00960efe63694a8395861c4135d0af4957074352ea9047ebbf798560d3ed","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-12-10T07:47:51Z","title_canon_sha256":"0f1c020ed378de7c9a4a348aa89fc34e4f18bdf38085f5339684b5560d7a1228"},"schema_version":"1.0","source":{"id":"1412.3220","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1412.3220","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"arxiv_version","alias_value":"1412.3220v1","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1412.3220","created_at":"2026-05-18T02:31:37Z"},{"alias_kind":"pith_short_12","alias_value":"EM3RGHKDMSWJ","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"EM3RGHKDMSWJS2M2","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"EM3RGHKD","created_at":"2026-05-18T12:28:28Z"}],"graph_snapshots":[{"event_id":"sha256:f3537f69cf19aff7f1465436122effc3d7e2645e12dfd0584f78bd37a79d85b8","target":"graph","created_at":"2026-05-18T02:31:37Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"A method to determine the gamma correction curves for displays is presented. An empirical model is first constructed from exhaustive measurements of a few representative units. The model parameters for the remaining units are then fitted using only a few measurements. The method uses standard least-squares algorithms and is computationally light. Experimental results for a small sample of LCD displays are presented.","authors_text":"Jani Isohanni, Robert Piche","cross_cats":["physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-12-10T07:47:51Z","title":"An empirical-parametric gamma calibration algorithm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1412.3220","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:78cb274eb96a783080c63b9ec8f2266efaaeb54a4bbb5584748f94bdb08a2ef1","target":"record","created_at":"2026-05-18T02:31:37Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"cadf00960efe63694a8395861c4135d0af4957074352ea9047ebbf798560d3ed","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2014-12-10T07:47:51Z","title_canon_sha256":"0f1c020ed378de7c9a4a348aa89fc34e4f18bdf38085f5339684b5560d7a1228"},"schema_version":"1.0","source":{"id":"1412.3220","kind":"arxiv","version":1}},"canonical_sha256":"2337131d4364ac99699abbd5ec15ee5f76da4182757442fc1e092e07b8cad568","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2337131d4364ac99699abbd5ec15ee5f76da4182757442fc1e092e07b8cad568","first_computed_at":"2026-05-18T02:31:37.219730Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:31:37.219730Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UHvAGnJULtj6p8xnHC/sD+Y5cCtlnxm9BkHEEvvn65hpyScrOo+9ZEeZpRR4heqL/txfQC4UgUNgY/c3hj4UBg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:31:37.220380Z","signed_message":"canonical_sha256_bytes"},"source_id":"1412.3220","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:78cb274eb96a783080c63b9ec8f2266efaaeb54a4bbb5584748f94bdb08a2ef1","sha256:f3537f69cf19aff7f1465436122effc3d7e2645e12dfd0584f78bd37a79d85b8"],"state_sha256":"329b849b905e3609c4361ee6c0afbc6ad93e238e3ddb8b5d81e3e94348c0b7b7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m/G8YDiu8oimDdbY3wpL/FFFz+Y0JytteUKUSSEIPnTUZ7BwKS8OF4ckNJFy3SRuRMT02ex/UfGn1tecfo2LAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T09:12:58.668639Z","bundle_sha256":"0938a43acddf533d95e97e554e289735b1c8d1225f669d9a5587c08f7e2c373a"}}