MNG Tags

This table contains definitions for tags found in MNG and JNG images. MNG is a superset of PNG and JNG, so a MNG image may contain any of these tags as well as any PNG tags. Conversely, only some of these tags are valid for JNG images.

Tag ID Tag Name Writable Values / Notes 'BACK' Background - --> MNG Background Tags 'BASI' BasisObject - --> MNG BasisObject Tags 'CLIP' ClipObjects - --> MNG ClipObjects Tags 'CLON' CloneObject - --> MNG CloneObject Tags 'DBYK' DropByKeyword N   'DEFI' DefineObject - --> MNG DefineObject Tags 'DHDR' DeltaPNGHeader - --> MNG DeltaPNGHeader Tags 'DISC' DiscardObjects N   'DROP' DropChunks N   'FRAM' Frame N   'JHDR' JNGHeader - --> MNG JNGHeader Tags 'LOOP' Loop - --> MNG Loop Tags 'MAGN' MagnifyObject - --> MNG MagnifyObject Tags 'MHDR' MNGHeader - --> MNG MNGHeader Tags 'MOVE' MoveObjects - --> MNG MoveObjects Tags 'ORDR' OrderingRestrictions N   'PAST' PasteImage - --> MNG PasteImage Tags 'PPLT' PartialPalette N   'PROM' PromoteParent - --> MNG PromoteParent Tags 'SAVE' SaveObjects N   'SEEK' SeekPoint N   'SHOW' ShowObjects - --> MNG ShowObjects Tags 'TERM' TerminationAction - --> MNG TerminationAction Tags 'eXPi' ExportImage - --> MNG ExportImage Tags 'fPRI' FramePriority - --> MNG FramePriority Tags 'nEED' ResourcesNeeded N   'pHYg' GlobalPixelSize - --> PNG PhysicalPixel Tags

MNG Background Tags

Index Tag Name Writable Values / Notes 0 BackgroundColor N   6 MandatoryBackground N 0 = Color and Image Advisory 1 = Color Mandatory, Image Advisory 2 = Color Advisory, Image Mandatory 3 = Color and Image Mandatory 7 BackgroundImageID N   9 BackgroundTiling N 0 = No 1 = Yes

MNG BasisObject Tags

Index Tag Name Writable Values / Notes 0 ImageWidth N   4 ImageHeight N   8 BitDepth N   9 ColorType N 0 = Grayscale 2 = RGB 3 = Palette 4 = Grayscale with Alpha 6 = RGB with Alpha 10 Compression N 0 = Deflate/Inflate 11 Filter N 0 = Adaptive 12 Interlace N 0 = Noninterlaced 1 = Adam7 Interlace 13 RedSample N   17 GreenSample N   21 BlueSample N   25 AlphaSample N   26 Viewable N

MNG ClipObjects Tags

Index Tag Name Writable Values / Notes 0 FirstObject N   2 LastObject N   4 DeltaType N 0 = Absolute 1 = Relative 5 ClipBoundary N

MNG CloneObject Tags

Index Tag Name Writable Values / Notes 0 SourceID N   2 CloneID N   4 CloneType N 0 = Full 1 = Parital 2 = Renumber object 5 DoNotShow N   6 ConcreteFlag N   7 LocalDeltaType N 0 = Absolute 1 = Relative 8 DeltaXY N

MNG DefineObject Tags

Index Tag Name Writable Values / Notes 0 ObjectID N   2 DoNotShow N   3 ConcreteFlag N   4 XYLocation N   12 ClippingBoundary N

MNG DeltaPNGHeader Tags

Index Tag Name Writable Values / Notes 0 ObjectID N   2 ImageType N 0 = Unspecified 1 = PNG 2 = JNG 3 DeltaType N 0 = Full Replacement 1 = Pixel Addition 2 = Alpha Addition 3 = Color Addition 4 = Pixel Replacement 5 = Alpha Replacement 6 = Color Replacement 7 = No Change 4 BlockSize N   12 BlockLocation N

MNG JNGHeader Tags

Index Tag Name Writable Values / Notes 0 ImageWidth N   4 ImageHeight N   8 ColorType N 8 = Gray 10 = Color 12 = Gray Alpha 14 = Color Alpha 9 BitDepth N   10 Compression N 8 = Huffman-coded baseline JPEG 11 Interlace N 0 = Sequential 8 = Progressive 12 AlphaBitDepth N   13 AlphaCompression N 0 = MNG Grayscale IDAT 8 = JNG 8-bit Grayscale JDAA 14 AlphaFilter N 0 = Adaptive MNG (N/A for JPEG) 15 AlphaInterlace N 0 = Noninterlaced

MNG Loop Tags

Index Tag Name Writable Values / Notes 0 NestLevel N   1 IterationCount N   5 TerminationCondition N 0 = Deterministic, not cacheable 1 = Decoder discretion, not cacheable 2 = User discretion, not cacheable 3 = External signal, not cacheable 4 = Deterministic, cacheable 5 = Decoder discretion, cacheable 6 = User discretion, cacheable 7 = External signal, cacheable 6 IterationMinMax N   14 SignalNumber N

MNG MagnifyObject Tags

Index Tag Name Writable Values / Notes 0 FirstObjectID N   2 LastObjectID N   4 XMethod N 0 = No Magnification 1 = Pixel Replication 2 = Linear Interpolation 3 = Closest Pixel 4 = Color Linear Interpolation and Alpha Closest Pixel 5 = Color Closest Pixel and Alpha Linear Interpolation 5 XMag N   7 YMag N   9 LeftMag N   11 RightMag N   13 TopMag N   15 BottomMag N   17 YMethod N 0 = No Magnification 1 = Pixel Replication 2 = Linear Interpolation 3 = Closest Pixel 4 = Color Linear Interpolation and Alpha Closest Pixel 5 = Color Closest Pixel and Alpha Linear Interpolation

MNG MNGHeader Tags

Index Tag Name Writable Values / Notes 0 ImageWidth N   1 ImageHeight N   2 TicksPerSecond N   3 NominalLayerCount N   4 NominalFrameCount N   5 NominalPlayTime N   6 SimplicityProfile N

MNG MoveObjects Tags

Index Tag Name Writable Values / Notes 0 FirstObject N   2 LastObject N   4 DeltaType N 0 = Absolute 1 = Relative 5 DeltaXY N

MNG PasteImage Tags

Index Tag Name Writable Values / Notes 0 DestinationID N   2 TargetDeltaType N 0 = Absolute 1 = Relative 3 TargetXY N   11 SourceID N   13 CompositionMode N 0 = Over 1 = Replace 2 = Under 14 Orientation N 0 = Same as source 2 = Flipped left-right, then up-down 4 = Flipped left-right 6 = Flipped up-down 8 = Tiled 15 OffsetOrigin N 0 = Desination Origin 1 = Target Origin 16 OffsetXY N   24 BoundaryOrigin N 0 = Desination Origin 1 = Target Origin 25 PastClippingBoundary N

MNG PromoteParent Tags

Index Tag Name Writable Values / Notes 0 NewColorType N   1 NewBitDepth N   2 FillMethod N 0 = Bit Replication 1 = Zero Fill

MNG ShowObjects Tags

Index Tag Name Writable Values / Notes 0 FirstObject N   2 LastObject N   4 ShowMode N

MNG TerminationAction Tags

Index Tag Name Writable Values / Notes 0 TerminationAction N 0 = Show Last Frame 1 = Display Nothing 2 = Show First Frame 3 = Repeat Sequence 1 IterationEndAction N 0 = Show Last Frame 1 = Display Nothing 2 = Show First Frame 2 Delay N   6 IterationMax N

MNG ExportImage Tags

Index Tag Name Writable Values / Notes 0 SnapshotID N   2 SnapshotName N

MNG FramePriority Tags

Index Tag Name Writable Values / Notes 0 DeltaType N 0 = Absolute 1 = Relative 2 Priority N

<-- ExifTool Tag Names