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Advanced Function Presentation Consortium 
Presentation Object Subsets for 
AFP
AFPC-0002-02
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Copyright©AFPConsortium2010,2013
ii
SecondEdition(November2013)
ThiseditionappliestotheAdvancedFunctionPresentationarchitecture.ThisisthesecondeditionproducedbytheAFP
Consortiumandreplacesandmakesobsoletethepreviousedition(AFPC-0002-01).Thiseditionremainscurrentuntila
neweditionispublished.
Changesbetweenthepreviouseditionandthiseditionareindicatedbyaverticalbartotheleftofthechange,although
minoreditorialfixesarenotmarked.ThemajorchangeinthiseditionistheadditionofthedefinitionoftheAFPCPNG
Subset.
ThispublicationisavailablefromtheAFPConsortiumWebsiteat
http://www.afpcinc.org
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Copyright©AFPConsortium2010,2013
iii
Contents
Chapter1.Introduction .. ... ... .... ... ... .... ... .... ... ... .... ... ... .... ..1
Chapter2.TaggedImageFileFormat(TIFF). ... .... ... .... ... ... .... ... ... .... ..3
Overview...............................................................................................................................................3
SubsetSpecification................................................................................................................................3
FullySupportedStandardTags..............................................................................................................4
StandardTagsSupportedwithRestrictions...............................................................................................4
UnsupportedStandardTags..................................................................................................................5
AdditionalSupportedTags....................................................................................................................6
Multi-pageTIFFs.....................................................................................................................................7
TransparencyMasks................................................................................................................................7
Resources.............................................................................................................................................7
Object-typeOID..................................................................................................................................7
References........................................................................................................................................8
Chapter3.JointPhotographicExpertsGroup(JPEG) ... .... ... ... .... ... ... .... ..9
Overview...............................................................................................................................................9
Specification..........................................................................................................................................9
ColorSpaces.....................................................................................................................................9
StartofFrame(SOF)Markers..............................................................................................................10
OtherIssues....................................................................................................................................10
Resources...........................................................................................................................................11
Object-typeOID................................................................................................................................11
References......................................................................................................................................11
Chapter4.PortableNetworkGraphics(PNG)... .... ... .... ... ... .... ... ... .... .13
Overview.............................................................................................................................................13
SubsetSpecification..............................................................................................................................13
FullySupportedChunks.....................................................................................................................13
ChunksSupportedwithRestrictions......................................................................................................13
UnsupportedChunks.........................................................................................................................13
Restrictions..........................................................................................................................................14
ColorTypesandBitDepths.................................................................................................................14
Palette............................................................................................................................................14
Transparency...................................................................................................................................14
ReservedandSafe-to-copybits...........................................................................................................14
OtherSupport.......................................................................................................................................14
Interlaceddataorder..........................................................................................................................14
Compression....................................................................................................................................15
FilterAlgorithms................................................................................................................................15
ColorManagement................................................................................................................................15
Resources...........................................................................................................................................15
Object-typeOID................................................................................................................................15
References......................................................................................................................................15
AppendixA.RelatedPublications. .... ... ... .... ... .... ... ... .... ... ... .... .17
AppendixB.AdobeAPP14JPEGMarker... ... .... ... .... ... ... .... ... ... .... .19
Glossary... ... ... .... ... ... .... ... ... .... ... .... ... ... .... ... ... .... .21
Index . .... ... ... .... ... ... .... ... ... .... ... .... ... ... .... ... ... .... .25
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iv
PresentationObjectSubsetsforAFP
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Copyright©AFPConsortium2010,2013
1
Chapter1. Introduction
AdvancedFunctionPresentation(AFP)datastreamsallowinclusionofnon-AFPobjects.Insomecases,such
asTIFF,theformatscancontainawidevarietyoffeaturesanddataformats.Someofthesefeaturesmaynot
bewelldefined,whileothersmayberarelyusedinpractice.Popularformatsmayalsobeextendedinvarious
waystosupportparticularapplications,orprivatelyenhancedormodifiedbydifferentvendors.Adefinitivelist
offeaturesandextensionsmaynotexist,whichmakesitveryhardorimpossibleforAFPproductstosupport
allthepossiblefeaturesofeachnon-AFPobjecttype.
ThisbookdescribesAFPCSubsetsforsomeoftheobjecttypesthatcanbeembeddedinAFP.Themembers
oftheAFPConsortium(AFPC)haveagreedthattheirproductswillsupportallthefeaturesandprocessing
instructionsdescribedineachsubset.
EachsubsetisaminimumsetoffunctionssupportedbyalltheAFPCmembers.AFPproductsmaysupport
additionalfeaturesthatarenotpartofasubset.Thereisnoguarantee,however,thatadifferentproduct,even
fromthesamevendor,willsupporttheseadditionalfeaturesinthesameway.
Eachsubsetisdescribedinaseparatechapter.Subsetsaredefinedrelativetotheunderlyingobjecttype.The
specificationassumesthereaderisfamiliarwiththeobjecttypethatisthebasisforthesubset.Inadditionto
thesubsetspecification,eachchapterwilllisttherelevantObject-typeObjectIDs(OIDs)thatcanbeusedfor
theconformantobjectsandmainreferencesdescribingtheobjecttype.AppendixA,“RelatedPublications”
listsreferencesthatapplytomultipleobjecttypes.
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2
PresentationObjectSubsetsforAFP
Copyright©AFPConsortium2010,2013
3
Chapter2. Tagged Image File Format (TIFF)
TaggedImageFileFormat(TIFF)isarichimageformatthatisalsoeasilyextendedbyusingprivatetags.This
makesTIFFadifficultformattoprocess.Mostoftheimageapplications,however,useacontainedTIFF
subset.ThepurposeofthischapteristodefineaTIFFsubsetthatwouldberelativelystraightforwardto
process,butstillmeettheneedsofmostprintingapplications,aswellascovermostTIFFimagesencountered
inpractice.ThissubsetiscalledtheAFPCTIFFSubset.
AFPCTIFFSubsetisdefinedrelativetothewholeTIFF6.0Specification.Itisnotdefinedrelativetothe
“baselineTIFF”describedinthespecification,sincethebaselinesubsetismuchtoorestrictivetobeuseful.
Overview
ThissectiondescribesthemainTIFFfeaturesincludedinthesubset.Thepurposeistogiveanoverviewand
explaintherationaleforsomeofthemainrestrictions.TheSpecificationsectiondescribesthedetailsfromthe
technicalperspective.
ThisTIFFsubsetistunedforprinting,withtheassumptionthattheTIFFobjectsareincludedintheAFPdata
streamusingtheobjectcontainermechanism.Bothsingleandmultiple-pageTIFFsaresupportedinthis
subset.PleaseseeMulti-pageTIFFsbelow.
Thumbnails(reducedresolutionimages)arenotsupportedinthissubset,sincethumbnailsarenotmeantfor
printing.
Transparencymaskimagesarenotsupported,sincepopularimageprocessingprogramsusedtogenerate
andviewimagesdonotsupportthem.Instead,transparencymasksaresupportedviatheExtraSamplestag,
asexplainedintheTransparencyMaskssectionbelow.
Tiledimagesarenotsupported,sincetheyareseldomencounteredinpractice.
Theold-styleJPEGdata(compression6)haswell-documentedproblemsandisnotsupported.JPEG-
compresseddataissupportedviathecompression7mechanismdefinedinTIFFTechNote2.Anyimage
conformingtotheJPEGobjectsubsetissupportedundercompression7.
TIFFallowsprivatetags.ApplicationscanobtainreservedtagIDsfromAdobefortheirprivatetags.Ifa
receiverencountersanunknowntag,theTIFFspecificationinstructsittoignoreit.Ifareceiverencountersa
privatetagthatitunderstandsandwhosevaluesconflictwithastandardtag,theAFPCTIFFSubsetgives
prioritytothestandardtag.
SubsetSpecification
ThissubsetisbasedontheTIFFRelease6.0specification,combinedwiththeTIFFTechNote2,which
definesanewwayofincorporatingJPEG-compresseddata.Notethatastandardtagmeansatagdescribedin
TIFFRelease6.0specification,notataginthebaselineTIFFsubset.
4
PresentationObjectSubsetsforAFP
FullySupportedStandard Tags
ThefollowingstandardTIFFtagsarefullysupported:
Table1.FullySupportedStandardTIFFTags
HexTagID
TagName
X'FF'
SubfileType
X'100'
ImageWidth
X'101'
ImageLength
X'10A'
FillOrder
X'111'
StripOffsets
X'112'
Orientation
X'116'
RowsPerStrip
X'117'
StripByteCounts
X'11A'
XResolution
X'11B'
YResolution
X'11C'
PlanarConfiguration
X'11E'
XPosition
X'11F'
YPosition
X'122'
GrayResponseUnit
X'123'
GrayResponseCurve
X'124'
T4Options
X'125'
T6Options
X'13D'
Predictor
X'140'
ColorMap
X'211'
YCbCrCoefficients
X'212'
YCbCrSubsampling
X'214'
ReferenceBlackWhite
StandardTagsSupportedwithRestrictions
X'FE'–NewSubfileType
Thumbnailandtransparencymaskimagesareskipped.PleaseseetheMulti-pageTIFFsand
TransparencyMaskssectionsbelow.
X'102'–BitsPerSample
1and8bitspercolorchannel.Iftheimagehasmultiplechannels,allchannelsmusthavethesamebit
depth.1bitdataissupportedonlyforPhotometricInterpretationsof0and1(i.e.,blackandwhite).All
multichannelimagesmustbe8bitsperchannel.
Note:Extrasamplesthatdescribetransparencymaskscanbe1-bitinplanarimages,regardlessof
thebitdepthofthemaincolorchannels.
X'103'–Compression
PresentationObjectSubsetsforAFP
5
Old-styleJPEGcompression(6)isnotsupported.JPEGcompression7(seeTIFFTechNote2)is
supportedinstead.
X'106'–PhotometricInterpretation
CIELabisassumedtohavetheD65illuminant,whichfollowsfromtheTIFFspecification.
TheYCbCrcolorspaceistreatedasadevice-dependentRGBcolorspacethathasbeentransformed
usingthedefaultweightsfromtheTIFFspecification(ITU-RRecommendationBT.601,whichwas
CCIRRecommendation601-1whentheTIFFSpecificationwaspublished).TheYCbCrCoefficients
tagissupportediftheapplicationhasuseddifferentweights.
RGBandCMYKimagesthatareotherwiseunqualifiedaretreatedasdevice-dependentandreceivers
caninterpretthecolorinformationastheydeemappropriate.
PleaseseeAppendixBonissuesrelatedtoprocessingofJPEG-compressedimagesgeneratedby
Adobeproducts.
X'115'–SamplesPerPixel
Onlycertainextrasamplesaresupported.SeetheTransparencyMaskssectionbelow.
X'128'–ResolutionUnit
Relativeresolutiontreatedasinches(i.e.,1treatedas2).
X'129'–PageNumber
Thesecondvalue,indicatingthetotalnumberofimagesinthefile,isignored.
X'152'–ExtraSamples
Onlycertainextrasamples,carryingassociatedalphadatadenotingtransparencymask,are
supported.SeetheTransparencyMaskssectionbelow.
UnsupportedStandardTags
Thefollowingunsupportedtagsareignored:
Table2.UnsupportedStandardTIFFTags
HexTagID
TagName
X'107'
Thresholding
X'108'
CellWidth
X'109'
CellLength
X'10D'
DocumentName
X'10E'
ImageDescription
X'10F'
Make
X'110'
Model
X'118'
MinSampleValue
X'119'
MaxSampleValue
X'11D'
PageName
X'120'
FreeOffsets
X'121'
FreeByteCounts
X'12D'
TransferFunction
X'131'
Software
X'132'
DateTime
6
PresentationObjectSubsetsforAFP
Table2 UnsupportedStandardTIFFTags(cont'd.)
HexTagID
TagName
X'13B'
Artist
X'13C'
HostComputer
X'13E'
WhitePoint
X'13F'
PrimaryChromaticities
X'141'
HalftoneHints
X'142'
TileWidth
X'143'
TileLength
X'144'
TileOffsets
X'145'
TileByteCounts
X'14C'
InkSet
X'14D'
InkNames
X'14E'
NumberOfInks
X'150'
DotRange
X'151'
TargetPrinter
X'153'
SampleFormat
X'154'
SMinSampleValue
X'155'
SMaxSampleValue
X'156'
TransferRange
X'200'
JPEGProc
X'201'
JPEGInterchangeFormat
X'202'
JPEGInterchangeFormatLength
X'203'
JPEGRestartInterval
X'205'
JPEGLosslessPredictors
X'206'
JPEGPointTransforms
X'207'
JPEGQTables
X'208'
JPEGDCTables
X'209'
JPEGACTables
X'213'
YCbCrPositioning
X'8298'
Copyright
AdditionalSupportedTags
X'8773'–ICCProfile
Ifthereceivingproductcancolormanage,itmustusetheICCProfileprovidedinthefile.
Note:Thereceiverscanusetheinformationasappropriateintheircolormanagementscheme.For
example,itisvalidfortheproducttolettheuseroverridetheembeddedprofile.Itshouldalso
benotedthatsupportofembeddedICCProfilesisasystem-levelrequirement,notatransform
requirement.AprintservercanextracttheICCProfilefromthedata,makeanauditColor
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