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@ -23,30 +23,41 @@ |
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## Implementation Status |
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## Implementation Status |
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### Deviations from the TIFF spec (to be fixed) |
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- Decoder |
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- A Baseline TIFF reader must skip over extra components (e.g. RGB with 4 samples per pixels) |
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- NB: Need to handle this for both planar and chunky data |
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- If the SampleFormat field is present and not 1 - fail gracefully if you cannot handle this |
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- Compression=None should treat 16/32-BitsPerSample for all samples as SHORT/LONG (for byte order and padding rows) |
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- RowsPerStrip should default to 2^32-1 (effectively infinity) to store the image as a single strip |
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- Check Planar format data - is this encoded as strips in order RGBRGBRGB or RRRGGGBBB? |
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- Make sure we ignore any strips that are not needed for the image (if too many are present) |
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### Compression Formats |
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### Compression Formats |
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| |Encoder|Decoder|Comments | |
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| |Encoder|Decoder|Comments | |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|None | | | | |
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|None | | Y | | |
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|Ccitt1D | | | | |
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|Ccitt1D | | | | |
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|PackBits | | | | |
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|PackBits | | Y | | |
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|CcittGroup3Fax | | | | |
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|CcittGroup3Fax | | | | |
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|CcittGroup4Fax | | | | |
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|CcittGroup4Fax | | | | |
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|Lzw | | | | |
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|Lzw | | Y | Based on ImageSharp GIF LZW implementation - this code could be modified to be (i) shared, or (ii) optimised for each case | |
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|Old Jpeg | | | | |
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|Old Jpeg | | | | |
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|Jpeg (Technote 2) | | | | |
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|Jpeg (Technote 2) | | | | |
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|Deflate (Technote 2) | | | | |
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|Deflate (Technote 2) | | Y | | |
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|Old Deflate (Technote 2) | | | | |
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|Old Deflate (Technote 2) | | Y | | |
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### Photometric Interpretation Formats |
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### Photometric Interpretation Formats |
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| |Encoder|Decoder|Comments | |
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| |Encoder|Decoder|Comments | |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|WhiteIsZero | | | | |
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|WhiteIsZero | | Y | General + 1/4/8-bit optimised implementations | |
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|BlackIsZero | | | | |
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|BlackIsZero | | Y | General + 1/4/8-bit optimised implementations | |
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|Rgb (Chunky) | | | | |
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|Rgb (Chunky) | | Y | General + Rgb888 optimised implementation | |
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|Rgb (Planar) | | | | |
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|Rgb (Planar) | | Y | General implementation only | |
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|PaletteColor | | | | |
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|PaletteColor | | Y | General implementation only | |
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|TransparencyMask | | | | |
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|TransparencyMask | | | | |
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|Separated (TIFF Extension) | | | | |
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|Separated (TIFF Extension) | | | | |
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|YCbCr (TIFF Extension) | | | | |
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|YCbCr (TIFF Extension) | | | | |
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@ -59,11 +70,11 @@ |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|---------------------------|:-----:|:-----:|--------------------------| |
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|NewSubfileType | | | | |
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|NewSubfileType | | | | |
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|SubfileType | | | | |
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|SubfileType | | | | |
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|ImageWidth | | | | |
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|ImageWidth | | Y | | |
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|ImageLength | | | | |
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|ImageLength | | Y | | |
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|BitsPerSample | | | | |
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|BitsPerSample | | Y | | |
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|Compression | | | | |
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|Compression | | Y | | |
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|PhotometricInterpretation | | | | |
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|PhotometricInterpretation | | Y | | |
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|Threshholding | | | | |
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|Threshholding | | | | |
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|CellWidth | | | | |
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|CellWidth | | | | |
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|CellLength | | | | |
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|CellLength | | | | |
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@ -71,26 +82,26 @@ |
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|ImageDescription | | | | |
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|ImageDescription | | | | |
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|Make | | | | |
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|Make | | | | |
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|Model | | | | |
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|Model | | | | |
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|StripOffsets | | | | |
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|StripOffsets | | Y | | |
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|Orientation | | | | |
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|Orientation | | | | |
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|SamplesPerPixel | | | | |
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|SamplesPerPixel | | | Currently ignored, as can be inferred from count of BitsPerSample | |
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|RowsPerStrip | | | | |
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|RowsPerStrip | | Y | | |
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|StripByteCounts | | | | |
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|StripByteCounts | | Y | | |
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|MinSampleValue | | | | |
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|MinSampleValue | | | | |
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|MaxSampleValue | | | | |
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|MaxSampleValue | | | | |
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|XResolution | | | | |
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|XResolution | | Y | | |
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|YResolution | | | | |
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|YResolution | | Y | | |
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|PlanarConfiguration | | | | |
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|PlanarConfiguration | | Y | | |
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|FreeOffsets | | | | |
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|FreeOffsets | | | | |
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|FreeByteCounts | | | | |
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|FreeByteCounts | | | | |
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|GrayResponseUnit | | | | |
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|GrayResponseUnit | | | | |
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|GrayResponseCurve | | | | |
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|GrayResponseCurve | | | | |
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|ResolutionUnit | | | | |
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|ResolutionUnit | | Y | | |
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|Software | | | | |
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|Software | | | | |
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|DateTime | | | | |
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|DateTime | | | | |
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|Artist | | | | |
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|Artist | | | | |
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|HostComputer | | | | |
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|HostComputer | | | | |
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|ColorMap | | | | |
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|ColorMap | | Y | | |
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|ExtraSamples | | | | |
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|ExtraSamples | | | | |
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|Copyright | | | | |
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|Copyright | | | | |
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Andrew Wilkinson
9 years ago