{"schema":"record/v1","id":"art_01M5NP4NGQ06ZEKK7K06VQYNCX","type":"article","revision":1,"etag":"\"r1.s0\"","title":"When I export from a layered editor to PNG, JPEG or AVIF, what colour tag and transparency does each format record, and what does Krita's exporter do by default?","summary":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.","status":"active","body":{"text":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.\n\nCurator qualifications: Specs and code read 2026-10-22; no file exported. T.81 interchange-scope sentence and the PNG chunk-priority table carried from producer/other batches.\n\nLimitations: Specs and code read 2026-10-22; no file exported. Krita defaults are code defaults; GUI-remembered settings may differ.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://aomediacodec.github.io/av1-avif/v1.2.0.html","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://www.color.org/technotes/ICC-Technote-ProfileEmbedding.pdf","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://www.w3.org/Graphics/JPEG/itu-t81.pdf","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/png/kis_png_export.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_export.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_converter.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"}]},"categories":["T12","T17"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","claim":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.","locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","classification":"sourced_fact"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-58974e211284b2ac3309820e8fc484c4da99ef2e/record.json#p-58974e211284b2ac3309820e8fc484c4da99ef2e/record","import_batch_id":"pipe-bf856d3149290926aa80a985b9ff03bba7e2b99d","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-bf856d3149290926aa80a985b9ff03bba7e2b99d","original":{"body":{"text":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.\n\nCurator qualifications: Specs and code read 2026-10-22; no file exported. T.81 interchange-scope sentence and the PNG chunk-priority table carried from producer/other batches.\n\nLimitations: Specs and code read 2026-10-22; no file exported. Krita defaults are code defaults; GUI-remembered settings may differ.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://aomediacodec.github.io/av1-avif/v1.2.0.html","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://www.color.org/technotes/ICC-Technote-ProfileEmbedding.pdf","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://www.w3.org/Graphics/JPEG/itu-t81.pdf","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/png/kis_png_export.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_export.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"},{"url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_converter.cc","note":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634"}]},"tags":[],"type":"article","links":[],"title":"When I export from a layered editor to PNG, JPEG or AVIF, what colour tag and transparency does each format record, and what does Krita's exporter do by default?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.","evidence":{"claims":[{"url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","claim":"PNG records colour via cICP, iCCP or sRGB chunks (cICP takes priority). JPEG carries an ICC profile only in APP2 'ICC_PROFILE' chunks (at most 16,707,345 bytes) and has no alpha. AVIF stores alpha as an auxiliary image and can flag premultiplied colour with a 'prem' reference. In Krita's source, PNG export defaults to keeping alpha, converting to sRGB (forceSRGB) and not writing cICP; JPEG export embeds the profile by default and flattens transparency onto a fill colour.","locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","classification":"sourced_fact"}],"review":"unreviewed","execution":"not_run","inspection":"source_inspected","execution_record_ids":[]},"language":"en","categories":["T12","T17"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":2,"topic_ids":["CAT:T17.02"],"confidence":"Low.","limitations":["Specs and code read 2026-10-22; no file exported.","Krita defaults are code defaults; GUI-remembered settings may differ.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: S01: a3ac82bb9eb8664b93961a2a9ff6def3d70e3a9f63d92721143c1f391d04edec; S03: 1fa5c22752005e30755ca9ba818111d37edfb57be7d2ed0fea28994f157beb72; S05: b5714bc115bcebb628366784c0a70b2c4dfb126e1dad5aef59f45c7a6f28b6e2; S07: sha256:631031d4ba56b06abee3e312a0f235b9422da9c7267d1c8f7604418795768bf0 (fetched bytes, file t81.pdf); S13: e97029135f6c0ca2d2477c8058dff827b38f66d827adcfd98dcc5ce23268c3b4; S14: 982722a5973ac49832e9a7ace1878f51eebf2e54d5edf2f28394db385b7f65e9; S15: af696a456bc729506b47d9bf60af35014c9770356140972a1d35a28ca0f0c2fd"],"observed_at":"2026-10-22T16:09:50.000Z","source_pins":[{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:7515a9b4eaca7de5a78ec6ab","version_id":"ver:f3a853038d243f91c754909b","observed_at":"2026-10-22T14:15:53.000Z","canonical_url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","version_sha256":"2577d8b823b708a4264e8aa401908ea59c802f021629f35a0b94add017b8dc9a"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:d72fe8b7c345005dc048693e","version_id":"ver:87d28a1fa358d6002873eaa0","observed_at":"2026-10-22T16:09:50.000Z","canonical_url":"https://aomediacodec.github.io/av1-avif/v1.2.0.html","version_sha256":"218dc9a794428ae31121db2b368698c5987af4e9eacfb68835ccb20389a85085"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:62a346a38c7888f53becd205","version_id":"ver:2b468229e47dd1246d63976c","observed_at":"2026-10-22T19:09:20.000Z","canonical_url":"https://www.color.org/technotes/ICC-Technote-ProfileEmbedding.pdf","version_sha256":"6b9ffc24acd963367a7f2da67d41a9abe00bbafbaa2bdfe4d364f0b4f6fc539f"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:249d38488ba936c6f311c71e","version_id":"ver:c64f896a7f19aed25ad1087c","observed_at":"2026-10-22T16:09:50.000Z","canonical_url":"https://www.w3.org/Graphics/JPEG/itu-t81.pdf","version_sha256":"51c820abd619d8cb7842ab8d58b912b42d4749530b70f989c87833393750087e"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:b865f1e6896a793e94ea02f8","version_id":"ver:febddf4809566f6c0c349fc8","observed_at":"2026-10-22T16:09:50.000Z","canonical_url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/png/kis_png_export.cc","version_sha256":"285791a090364145202ac472c18b14801e1e37b809605401aadace872ff2294a"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:a757ac56a7c17d5819b9f1cd","version_id":"ver:fb376a71d0b3a870351dc4b2","observed_at":"2026-10-22T16:09:50.000Z","canonical_url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_export.cc","version_sha256":"c5d881f466a9605a8d103f7c812f6ad13241df8cd578dae234b9d1e48183e58c"},{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:ebb4b417165e39f5e9940056","version_id":"ver:083bc0516d9364d643dd0aa6","observed_at":"2026-10-22T16:09:50.000Z","canonical_url":"https://github.com/KDE/krita/blob/ec6a328c805b397dddbacd48d5e1a950540c0792/plugins/impex/jpeg/kis_jpeg_converter.cc","version_sha256":"7eda13eb35cc9140d499e284907855b95488929a44048b57dd0f4b6bc045be84"}],"candidate_id":"C2-B55-P3-03","claim_status":"source_fact","rights_basis":"Original curator/discovery summary with short quotations; public sources; source rights unchanged and not cleared for reuse of the source itself.","qualification":"shared_operator_desk_qa","supersedes_sha256":"874fded7ddc7b3eff93111dcad85bb7845e4470844a6851f6e2393fb49264875"}},"visibility":"public","attribution":{"origin":"research_agent","upstream_url":null,"imported_from":null,"upstream_owner":null,"import_batch_id":null}},"observed_on":null,"original_id":"p-58974e211284b2ac3309820e8fc484c4da99ef2e/record","source_file":"records/p-58974e211284b2ac3309820e8fc484c4da99ef2e/record.json","research_side":{},"source_schema":"create-record-input/v1","original_sha256":"f8fbf8cae4b408b01d8e021d3706af5c1a327eade4194fa38d37eeaadd68ab0e","unmapped_fields":[]}],"publication":{"rule":"item_visibility","policy":"l05-publication/1","visibility":"public"}},"curation/v1":{"curator":"CURATOR-A-20261021","revision":2,"topic_ids":["CAT:T17.02"],"confidence":"Low.","limitations":["Specs and code read 2026-10-22; no file exported.","Krita defaults are code defaults; GUI-remembered settings may differ.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: S01: a3ac82bb9eb8664b93961a2a9ff6def3d70e3a9f63d92721143c1f391d04edec; S03: 1fa5c22752005e30755ca9ba818111d37edfb57be7d2ed0fea28994f157beb72; S05: b5714bc115bcebb628366784c0a70b2c4dfb126e1dad5aef59f45c7a6f28b6e2; S07: sha256:631031d4ba56b06abee3e312a0f235b9422da9c7267d1c8f7604418795768bf0 (fetched bytes, file t81.pdf); S13: e97029135f6c0ca2d2477c8058dff827b38f66d827adcfd98dcc5ce23268c3b4; S14: 982722a5973ac49832e9a7ace1878f51eebf2e54d5edf2f28394db385b7f65e9; S15: af696a456bc729506b47d9bf60af35014c9770356140972a1d35a28ca0f0c2fd"],"observed_at":"2026-10-22T16:09:50.000Z","source_pins":[{"locator":"ICC Technote: Profile Embedding (JPEG section); AV1 Image File Format v1.2.0, alpha item and item reference types; Krita plugins/impex/png/kis_png_export.cc at ec6a328 L109-126; Krita kis_jpeg_export.cc L71, L81, L167, L184; Krita kis_jpeg_converter.cc L622-634","source_id":"src:7515a9b4eaca7de5a78ec6ab","version_id":"ver:f3a853038d243f91c754909b","observed_at":"2026-10-22T14:15:53.000Z","canonical_url":"https://www.w3.org/TR/2025/REC-png-3-20250624/","version_sha256":"2577d8b823b708a4264e8aa401908ea59c802f021629f35a0b94add017b8dc9a"},{"locator":"ICC Technote: Profile Embedding (JPEG section); 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