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Image file directory (IFD)
Image file directory (IFD)
An IFD is a series of TIFF tags that provide a TIFF reader with instructions on how
An IFD is a series of TIFF tags that provide a TIFF reader with instructions on how
to interpret the data contained in the file. The IFD points to the location and amount
to interpret the data contained in the file. The IFD points to the location and amount
of pixel data. The IFD also points to the location and amount of frame data. An
of pixel data. The IFD also points to the location and amount of frame data. An
IFD must always begin on an even address. The first two bytes of an IFD indicate
IFD must always begin on an even address. The first two bytes of an IFD indicate
the number of entries it contains. Each entry in an IFD is a 12 byte structure as
the number of entries it contains. Each entry in an IFD is a 12 byte structure as
illustrated below:
illustrated below:
A
Entry Count = 00 12h
A + 2
New Subfile Type
A + 14 ImageWidth
A + 26 ImageLength
A + 38 BitsPerSample
A + 50 Compression
A + 62 PhotometricInterpretation
A + 74 FillOrder
A + 86 StripOffsets
A + 98 Orientation
A + 110 SamplesPerPixel
A + 122 RowsPerStrip
A + 134 StripByteCounts
A + 146 XResolution
A + 158 YResolution
A + 170 PlanarConfiguration
A + 182 ResolutionUnit
A + 194 Software
A + 206 PHOTRON FrameData
5-13
5-13
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