IEC61966-2-4(Firstedition–2006)Multimediasystemsandequipment–ColourmeasurementandmanagementPart2-4:Colourmanagement–Extended-gamutYCCcolourspaceforvideoapplications–xvYCCCORRIGENDUM1Page84.4DigitalquantizationmethodsReplacetheexistingnoteafterequation(7)bythefollowingnewnote:NOTEBitlevels“from0to2N-8-1”and“from255×2N-8to2N-1”(0and255,forthecaseof8-bitencoding)areusedexclusivelyforsynchronizationandarenotallowedforstoringcolourvalues.Levelsfrom“2N-8”to“255×2N-8-1”(from1to254,forthecaseof8-bitencoding)areavailable.Page95.2TransformationfromxvYCCvaluestoCIE1931XYZvaluesReplace,onpage10,theinequalitysignsforequations(12),(13)and(14)asfollows:From,BGR0810,,−<′′′to,BGR0810,,−≤′′′From0810,,0810,BGR,≤′′′≤−to0810,,0810,BGR,<′′′<−From0810,,,BGR>′′′to0810,,,BGR≥′′′Page13ReplacetheexistingAnnexA,bythefollowingnewAnnexA:AnnexA(informative)CompressionofspecularcomponentsofY’signalsThisannexdescribesanexamplemethodforthedynamicrangecompressionofthespecularcomponentsthatarebrighterthanwhiteinY′(orLuma)signal.InxvYCCcolourencoding,linearBGR,,valuesafterequation(8),ornon-linearBGR′′′,,valuesafterequations(9)to(11)arenotlimitedbetween0and1.AftertheYCCquantization(equation(14)),thevaluerangewillbelimitedasfollows:Y′signal:-15/219to+238/219(or-0,068493to+1,086758)rCbC′′,signal:-127/224to+126/224(or-0,566964to+0,562500)Forthesurfacecolours,Y′signalsshallbeintherangeof0and1,whileover-rangedvalues(greaterthan1,0orsmallerthan0,0)inbC′andrC′areusedforstoringsaturatedcolours.However,ifthespecularcomponentsthatarebrighterthanwhiteexistinacapturedimage,therewillbepixelswithY′signalsgreaterthan“1”.Thesecomponentsshouldbecompressed(orclipped)intothegivenquantizationrange.AnexampleforthespecularcompressionmethodisprovidedinFigureA.1.NOTEDifferentproprietarycompressionmethodsineitherY’componentsorR’G’B’componentsareusedinpractice.FigureA.1–ExampleforthespecularcompressionmethodEditor’sNote(pleasedeletethissentence);FigureA.1–ExampleofthespecularcompressionmethodNovember200606412819225600.511.522.53Y'dY'YxvYCC(8)2351625506412819225600.511.522.53Y'dY'YxvYCC(8)23516255
