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 no   'DEFI' DefineObject - --> MNG DefineObject Tags 'DHDR' DeltaPNGHeader - --> MNG DeltaPNGHeader Tags 'DISC' DiscardObjects no   'DROP' DropChunks no   'FRAM' Frame no   '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 no   'PAST' PasteImage - --> MNG PasteImage Tags 'PPLT' PartialPalette no   'PROM' PromoteParent - --> MNG PromoteParent Tags 'SAVE' SaveObjects no   'SEEK' SeekPoint no   'SHOW' ShowObjects - --> MNG ShowObjects Tags 'TERM' TerminationAction - --> MNG TerminationAction Tags 'eXPi' ExportImage - --> MNG ExportImage Tags 'fPRI' FramePriority - --> MNG FramePriority Tags 'nEED' ResourcesNeeded no   'pHYg' GlobalPixelSize - --> PNG PhysicalPixel Tags

MNG Background Tags

Index1 Tag Name Writable Values / Notes 0 BackgroundColor no   6 MandatoryBackground no 0 = Color and Image Advisory 1 = Color Mandatory, Image Advisory 2 = Color Advisory, Image Mandatory 3 = Color and Image Mandatory 7 BackgroundImageID no   9 BackgroundTiling no 0 = No 1 = Yes

MNG BasisObject Tags

Index1 Tag Name Writable Values / Notes 0 ImageWidth no   4 ImageHeight no   8 BitDepth no   9 ColorType no 0 = Grayscale 2 = RGB 3 = Palette 4 = Grayscale with Alpha 6 = RGB with Alpha 10 Compression no 0 = Deflate/Inflate 11 Filter no 0 = Adaptive 12 Interlace no 0 = Noninterlaced 1 = Adam7 Interlace 13 RedSample no   17 GreenSample no   21 BlueSample no   25 AlphaSample no   26 Viewable no

MNG ClipObjects Tags

Index1 Tag Name Writable Values / Notes 0 FirstObject no   2 LastObject no   4 DeltaType no 0 = Absolute 1 = Relative 5 ClipBoundary no

MNG CloneObject Tags

Index1 Tag Name Writable Values / Notes 0 SourceID no   2 CloneID no   4 CloneType no 0 = Full 1 = Parital 2 = Renumber object 5 DoNotShow no   6 ConcreteFlag no   7 LocalDeltaType no 0 = Absolute 1 = Relative 8 DeltaXY no

MNG DefineObject Tags

Index1 Tag Name Writable Values / Notes 0 ObjectID no   2 DoNotShow no   3 ConcreteFlag no   4 XYLocation no   12 ClippingBoundary no

MNG DeltaPNGHeader Tags

Index1 Tag Name Writable Values / Notes 0 ObjectID no   2 ImageType no 0 = Unspecified 1 = PNG 2 = JNG 3 DeltaType no 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 no   12 BlockLocation no

MNG JNGHeader Tags

Index1 Tag Name Writable Values / Notes 0 ImageWidth no   4 ImageHeight no   8 ColorType no 8 = Gray 10 = Color 12 = Gray Alpha 14 = Color Alpha 9 BitDepth no   10 Compression no 8 = Huffman-coded baseline JPEG 11 Interlace no 0 = Sequential 8 = Progressive 12 AlphaBitDepth no   13 AlphaCompression no 0 = MNG Grayscale IDAT 8 = JNG 8-bit Grayscale JDAA 14 AlphaFilter no 0 = Adaptive MNG (N/A for JPEG) 15 AlphaInterlace no 0 = Noninterlaced

MNG Loop Tags

Index1 Tag Name Writable Values / Notes 0 NestLevel no   1 IterationCount no   5 TerminationCondition no 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 no   14 SignalNumber no

MNG MagnifyObject Tags

Index1 Tag Name Writable Values / Notes 0 FirstObjectID no   2 LastObjectID no   4 XMethod no 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 no   7 YMag no   9 LeftMag no   11 RightMag no   13 TopMag no   15 BottomMag no   17 YMethod no 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

Index4 Tag Name Writable Values / Notes 0 ImageWidth no   1 ImageHeight no   2 TicksPerSecond no   3 NominalLayerCount no   4 NominalFrameCount no   5 NominalPlayTime no   6 SimplicityProfile no

MNG MoveObjects Tags

Index1 Tag Name Writable Values / Notes 0 FirstObject no   2 LastObject no   4 DeltaType no 0 = Absolute 1 = Relative 5 DeltaXY no

MNG PasteImage Tags

Index1 Tag Name Writable Values / Notes 0 DestinationID no   2 TargetDeltaType no 0 = Absolute 1 = Relative 3 TargetXY no   11 SourceID no   13 CompositionMode no 0 = Over 1 = Replace 2 = Under 14 Orientation no 0 = Same as source 2 = Flipped left-right, then up-down 4 = Flipped left-right 6 = Flipped up-down 8 = Tiled 15 OffsetOrigin no 0 = Desination Origin 1 = Target Origin 16 OffsetXY no   24 BoundaryOrigin no 0 = Desination Origin 1 = Target Origin 25 PastClippingBoundary no

MNG PromoteParent Tags

Index1 Tag Name Writable Values / Notes 0 NewColorType no   1 NewBitDepth no   2 FillMethod no 0 = Bit Replication 1 = Zero Fill

MNG ShowObjects Tags

Index1 Tag Name Writable Values / Notes 0 FirstObject no   2 LastObject no   4 ShowMode no

MNG TerminationAction Tags

Index1 Tag Name Writable Values / Notes 0 TerminationAction no 0 = Show Last Frame 1 = Display Nothing 2 = Show First Frame 3 = Repeat Sequence 1 IterationEndAction no 0 = Show Last Frame 1 = Display Nothing 2 = Show First Frame 2 Delay no   6 IterationMax no

MNG ExportImage Tags

Index1 Tag Name Writable Values / Notes 0 SnapshotID no   2 SnapshotName no

MNG FramePriority Tags

Index1 Tag Name Writable Values / Notes 0 DeltaType no 0 = Absolute 1 = Relative 2 Priority no

<-- ExifTool Tag Names