Add a number of TIFF specific constants/enums

src/ImageSharp.Formats.Tiff/Constants/TiffCompression.cs

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+// <copyright file="TiffCompression.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the compression formats defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffCompression
+    {
+        // TIFF baseline compression types
+
+        None = 1,
+        Ccitt1D = 2,
+        PackBits = 32773,
+
+        // TIFF Extension compression types
+
+        CcittGroup3Fax = 3,
+        CcittGroup4Fax = 4,
+        Lzw = 5,
+        OldJpeg = 6,
+
+        // Technote 2
+
+        Jpeg = 7,
+        Deflate = 8,
+        OldDeflate = 32946,
+
+        // TIFF-F/FX Extension
+
+        ItuTRecT82 = 9,
+        ItuTRecT43 = 10
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffExtraSamples.cs

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+// <copyright file="TiffExtraSamples.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the possible uses of extra-samples in TIFF format files.
+    /// </summary>
+    internal enum TiffExtraSamples
+    {
+        // TIFF baseline ExtraSample values
+
+        Unspecified = 0,
+        AssociatedAlpha = 1,
+        UnassociatedAlpha = 2
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffFillOrder.cs

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+// <copyright file="TiffFillOrder.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the fill orders defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffFillOrder
+    {
+        // TIFF baseline FillOrder values
+
+        MostSignificantBitFirst = 1,
+        LeastSignificantBitFirst = 2
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffNewSubfileType.cs

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+// <copyright file="TiffNewSubfileType.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    using System;
+
+    /// <summary>
+    /// Enumeration representing the sub-file types defined by the Tiff file-format.
+    /// </summary>
+    [Flags]
+    internal enum TiffNewSubfileType
+    {
+        // TIFF baseline subfile types
+
+        FullImage = 0x0000,
+        Preview = 0x0001,
+        SinglePage = 0x0002,
+        TransparencyMask = 0x0004,
+
+        // DNG Specification subfile types
+
+        AlternativePreview = 0x10000,
+
+        // TIFF-F/FX Specification subfile types
+        
+        MixedRasterContent = 0x0008
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffOrientation.cs

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+// <copyright file="TiffOrientation.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the image orientations defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffOrientation
+    {
+        /// TIFF baseline Orientation values
+
+        TopLeft = 1,
+        TopRight = 2,
+        BottomRight = 3,
+        BottomLeft = 4,
+        LeftTop = 5,
+        RightTop = 6,
+        RightBottom = 7,
+        LeftBottom = 8
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffPhotometricInterpretation.cs

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+// <copyright file="TiffPhotometricInterpretation.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the photometric interpretation formats defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffPhotometricInterpretation
+    {
+        // TIFF baseline color spaces
+
+        WhiteIsZero = 0,
+        BlackIsZero = 1,
+        Rgb = 2,
+        PaletteColor = 3,
+        TransparencyMask = 4,
+
+        // TIFF Extension color spaces
+
+        Separated = 5,
+        YCbCr = 6,
+        CieLab = 8,
+
+        // TIFF TechNote 1
+
+        IccLab = 9,
+
+        // TIFF-F/FX Specification
+
+        ItuLab = 10,
+
+        // DNG Specification
+
+        ColorFilterArray = 32803,
+        LinearRaw = 34892
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffPlanarConfiguration.cs

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+// <copyright file="TiffCompression.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the planar configuration types defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffPlanarConfiguration
+    {
+        // TIFF baseline PlanarConfiguration values
+
+        Chunky = 1,
+        Planar = 2
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffResolutionUnit.cs

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+// <copyright file="TiffResolutionUnit.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the resolution units defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffResolutionUnit
+    {
+        // TIFF baseline ResolutionUnit values
+
+        None = 1,
+        Inch = 2,
+        Centimeter = 2
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffSubfileType.cs

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+// <copyright file="TiffSubfileType.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the sub-file types defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffSubfileType
+    {
+        // TIFF baseline subfile types
+
+        FullImage = 1,
+        Preview = 2,
+        SinglePage = 3
+    }
+}

src/ImageSharp.Formats.Tiff/Constants/TiffThreshholding.cs

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+// <copyright file="TiffThreshholding.cs" company="James Jackson-South">
+// Copyright (c) James Jackson-South and contributors.
+// Licensed under the Apache License, Version 2.0.
+// </copyright>
+
+namespace ImageSharp.Formats
+{
+    /// <summary>
+    /// Enumeration representing the threshholding types defined by the Tiff file-format.
+    /// </summary>
+    internal enum TiffThreshholding
+    {
+        /// TIFF baseline Threshholding values
+
+        None = 1,
+        Ordered = 2,
+        Random = 3
+    }
+}