TIFF 6.0 Specification Coverage
++ The library is capable of dealing with images that are written to + follow the 5.0 or 6.0 TIFF spec. There is also considerable support + for some of the more esoteric portions of the 6.0 TIFF spec. +
+ |
+
+ TIFF 6.0 Specification Coverage++ The library is capable of dealing with images that are written to + follow the 5.0 or 6.0 TIFF spec. There is also considerable support + for some of the more esoteric portions of the 6.0 TIFF spec. + + |
+
| Core requirements | +
+ + Both "MM" and "II" byte orders are handled. + Both packed and separated planar configuration of samples. + Any number of samples per pixel (memory permitting). + Any image width and height (memory permitting). + Multiple subfiles can be read and written. + Editing is not supported in that related subfiles (e.g. + a reduced resolution version of an image) are not automatically + updated. + ++ Tags handled: ExtraSamples, ImageWidth, + ImageLength, NewSubfileType, ResolutionUnit. + Rowsperstrip, StripOffsets, StripByteCounts, + XResolution, YResolution + + |
+
|---|---|
| Tiled Images | +TileWidth, TileLength, TileOffsets, + TileByteCounts | +
| Image Colorimetry Information | +WhitePoint, PrimaryChromaticities, TransferFunction, + ReferenceBlackWhite | +
| Class B for bilevel images | +SamplesPerPixel = 1 + BitsPerSample = 1 + Compression = 1 (none), 2 (CCITT 1D), or 32773 (PackBits) + PhotometricInterpretation = 0 (Min-is-White), 1 (Min-is-Black) |
+
| Class G for grayscale images | +SamplesPerPixel = 1 + BitsPerSample = 4, 8 + Compression = 1 (none) 5 (LZW) + PhotometricInterpretation = 0 (Min-is-White), 1 (Min-is-Black) |
+
| Class P for palette color images | +SamplesPerPixel = 1 + BitsPerSample = 1-8 + Compression = 1 (none) 5 (LZW) + PhotometricInterpretation = 3 (Palette RGB) + ColorMap |
+
| Class R for RGB full color images | +SamplesPerPixel = 3 + BitsPerSample = <8,8,8> + PlanarConfiguration = 1, 2 + Compression = 1 (none) 5 (LZW) + PhotometricInterpretation = 2 (RGB) |
+
| Class F for facsimile | +(Class B tags plus...) + Compression = 3 (CCITT Group 3), 4 (CCITT Group 4) + FillOrder = 1 (MSB), 2 (LSB) + Group3Options = 1 (2d encoding), 4 (zero fill), 5 (2d+fill) + ImageWidth = 1728, 2048, 2482 + NewSubFileType = 2 + ResolutionUnit = 2 (Inch), 3 (Centimeter) + PageNumber, + XResolution, + YResolution, + Software, + BadFaxLines, + CleanFaxData, + ConsecutiveBadFaxLines, + DateTime, + DocumentName, + ImageDescription, + Orientation |
+
| Class S for separated images | +SamplesPerPixel = 4 + PlanarConfiguration = 1, 2 + Compression = 1 (none), 5 (LZW) + PhotometricInterpretation = 5 (Separated) + InkSet = 1 (CMYK) + DotRange, + InkNames, + DotRange, + TargetPrinter |
+
| Class Y for YCbCr images | +SamplesPerPixel = 3 + BitsPerSample = <8,8,8> + PlanarConfiguration = 1, 2 + Compression = 1 (none), 5 (LZW), 7 (JPEG) + PhotometricInterpretation = 6 (YCbCr) + YCbCrCoefficients, + YCbCrSubsampling, + YCbCrPositioning + (colorimetry info from Appendix H; see above) |
+
| Class "JPEG" for JPEG images (per TTN2) | +PhotometricInterpretation = 1 (grayscale), 2 (RGB), 5 (CMYK), 6 (YCbCr) + (Class Y tags if YCbCr) + (Class S tags if CMYK) + Compression = 7 (JPEG) |
+
+ In addition, the library supports some optional compression algorithms + that are, in some cases, of dubious value. +
+| Compression tag value | Compression algorithm |
|---|---|
| 32766 | NeXT 2-bit encoding |
| 32809 | ThunderScan 4-bit encoding |
| 32909 | Pixar companded 11-bit ZIP encoding |
| 32946 | PKZIP-style Deflate encoding (experimental) |
| 34676 | SGI 32-bit Log Luminance encoding (experimental) |
| 34677 | SGI 24-bit Log Luminance encoding (experimental) |
+ Note that there is no support for the JPEG-related tags defined + in the 6.0 specification; the JPEG support is based on the post-6.0 + proposal given in TIFF Technical Note #2. +
+ |
+ For more information on the experimental Log Luminance encoding + consult the materials available at + http://www.anyhere.com/gward/pixformat/tiffluv.html. | +
+ The following table shows the tags that are recognized + and how they are used by the library. If no use is indicated, + then the library reads and writes the tag, but does not use it internally. +
+| Tag Name | +Value | +R/W | +Library's Use (Comments) | +
|---|---|---|---|
| NewSubFileType | +254 | +R/W | +none (called SubFileType in <tiff.h>) | +
| SubFileType | +255 | +R/W | +none (called OSubFileType in <tiff.h>) | +
| ImageWidth | +256 | +R/W | +lots | +
| ImageLength | +257 | +R/W | +lots | +
| BitsPerSample | +258 | +R/W | +lots | +
| Compression | +259 | +R/W | +to select appropriate codec | +
| PhotometricInterpretation | +262 | +R/W | +lots | +
| Thresholding | +263 | +R/W | ++ |
| CellWidth | +264 | ++ | parsed but ignored | +
| CellLength | +265 | ++ | parsed but ignored | +
| FillOrder | +266 | +R/W | +control bit order | +
| DocumentName | +269 | +R/W | ++ |
| ImageDescription | +270 | +R/W | ++ |
| Make | +271 | +R/W | ++ |
| Model | +272 | +R/W | ++ |
| StripOffsets | +273 | +R/W | +data i/o | +
| Orientation | +274 | +R/W | ++ |
| SamplesPerPixel | +277 | +R/W | +lots | +
| RowsPerStrip | +278 | +R/W | +data i/o | +
| StripByteCounts | +279 | +R/W | +data i/o | +
| MinSampleValue | +280 | +R/W | ++ |
| MaxSampleValue | +281 | +R/W | ++ |
| XResolution | +282 | +R/W | ++ |
| YResolution | +283 | +R/W | +used by Group 3 2d encoder | +
| PlanarConfiguration | +284 | +R/W | +data i/o | +
| PageName | +285 | +R/W | ++ |
| XPosition | +286 | +R/W | ++ |
| YPosition | +286 | +R/W | ++ |
| FreeOffsets | +288 | ++ | parsed but ignored | +
| FreeByteCounts | +289 | ++ | parsed but ignored | +
| GrayResponseUnit | +290 | ++ | parsed but ignored | +
| GrayResponseCurve | +291 | ++ | parsed but ignored | +
| Group3Options | +292 | +R/W | +used by Group 3 codec | +
| Group4Options | +293 | +R/W | ++ |
| ResolutionUnit | +296 | +R/W | +used by Group 3 2d encoder | +
| PageNumber | +297 | +R/W | ++ |
| ColorResponseUnit | +300 | ++ | parsed but ignored | +
| TransferFunction | +301 | +R/W | ++ |
| Software | +305 | +R/W | ++ |
| DateTime | +306 | +R/W | ++ |
| Artist | +315 | +R/W | ++ |
| HostComputer | +316 | +R/W | ++ |
| Predictor | +317 | +R/W | +used by LZW codec | +
| WhitePoint | +318 | +R/W | ++ |
| PrimaryChromacities | +319 | +R/W | ++ |
| ColorMap | +320 | +R/W | ++ |
| TileWidth | +322 | +R/W | +data i/o | +
| TileLength | +323 | +R/W | +data i/o | +
| TileOffsets | +324 | +R/W | +data i/o | +
| TileByteCounts | +324 | +R/W | +data i/o | +
| BadFaxLines | +326 | +R/W | ++ |
| CleanFaxData | +327 | +R/W | ++ |
| ConsecutiveBadFaxLines | +328 | +R/W | ++ |
| SubIFD | +330 | +R/W | +subimage descriptor support | +
| InkSet | +332 | +R/W | ++ |
| InkNames | +333 | +R/W | ++ |
| DotRange | +336 | +R/W | ++ |
| TargetPrinter | +337 | +R/W | ++ |
| ExtraSamples | +338 | +R/W | +lots | +
| SampleFormat | +339 | +R/W | ++ |
| SMinSampleValue | +340 | +R/W | ++ |
| SMaxSampleValue | +341 | +R/W | ++ |
| JPEGTables | +347 | +R/W | +used by JPEG codec | +
| YCbCrCoefficients | +529 | +R/W | +used by TIFFReadRGBAImage support | +
| YCbCrSubsampling | +530 | +R/W | +tile/strip size calculations | +
| YCbCrPositioning | +531 | +R/W | ++ |
| ReferenceBlackWhite | +532 | +R/W | ++ |
| Matteing | +32995 | +R | +none (obsoleted by ExtraSamples tag) | +
| DataType | +32996 | +R | +none (obsoleted by SampleFormat tag) | +
| ImageDepth | +32997 | +R/W | +tile/strip calculations | +
| TileDepth | +32998 | +R/W | +tile/strip calculations | +
| StoNits | +37439 | +R/W | ++ |
+ The Matteing and DataType + tags have been obsoleted by the 6.0 + ExtraSamples and SampleFormat tags. + Consult the documentation on the + ExtraSamples tag and Associated Alpha for elaboration. Note however + that if you use Associated Alpha, you are expected to save data that is + pre-multipled by Alpha. If this means nothing to you, check out + Porter & Duff's paper in the '84 SIGGRAPH proceedings: "Compositing Digital + Images". +
++ The ImageDepth + tag is a non-standard, but registered tag that specifies + the Z-dimension of volumetric data. The combination of ImageWidth, + ImageLength, and ImageDepth, + defines a 3D volume of pixels that are + further specified by BitsPerSample and + SamplesPerPixel. The TileDepth + tag (also non-standard, but registered) can be used to specified a + subvolume "tiling" of a volume of data. +
++ The Colorimetry, and CMYK tags are additions that appear in TIFF 6.0. + Consult the TIFF 6.0 specification included in the doc directory + and online. +
++ The JPEG-related tag is specified in + TIFF Technical Note #2 which defines + a revised JPEG-in-TIFF scheme (revised over that appendix that was + part of the TIFF 6.0 specification). +
++ Last updated: $Date: 2005/12/28 06:53:18 $ +
+ + +