1. Code samples
2. Codecs
3. Tagged Image File Format (TIFF)

Write Extra Channel With Display Info

TIFF Extra Channels Adobe Resources Write Pipeline

Saves extra channels with display info to Adobe Resources.

Сode Snippet

public enum DisplayInfoMode
{
    Alpha = 0,
    InvertedAlpha = 1,
    Spot = 2,
}

public enum AdobeColorSpace
{
    RGB = 0,
    CMYK = 2,
    LAB = 7,
    Grayscale = 8,
}

public static void Run()
{
    var imageSize = new System.Drawing.Size(1000, 1000);

    using (var bitmap = new Bitmap(imageSize.Width, imageSize.Height, PixelFormat.Format8bppGrayscale, RgbColor.White))
    using (var tiffWriter = new TiffWriter("AdobeResourcesWithDisplayInfo.tif"))
    {
        var colors = new Color[]
        {
            RgbColor.Violet,
            new CmykColor(255, 0, 0, 0),
            new LabColor(140, 62, -39),
            new GrayscaleColor(222),
        };

        foreach (var color in colors)
        {
            tiffWriter.ExtraChannels.Add(new TiffExtraChannelEntry(CreateEllipse(imageSize), TiffChannelType.Color));
        }

        const byte solidity = 50;

        var displayInfoBlock = CreateDisplayInfoBlock(colors, solidity);

        tiffWriter.AdobeResources = new AdobeResourceDictionary();

        // https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/
        const int displayInfo = 0x0435;

        tiffWriter.AdobeResources.Add(displayInfo, displayInfoBlock);

        Pipeline.Run(bitmap + tiffWriter);
    }
}

public static Bitmap CreateEllipse(System.Drawing.Size size)
{
    var bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format8bppGrayscale);

    var fillRect = new System.Drawing.Rectangle(new System.Drawing.Point(0, 0), size);

    using (var gr = bitmap.GetAdvancedGraphics())
    {
        bitmap.Fill(RgbColor.White);
        gr.FillEllipse(new SolidBrush(RgbColor.Black), fillRect);
    }

    return bitmap;
}

public static AdobeResourceBlock CreateDisplayInfoBlock(Color[] colors, byte solidity)
{
    if (solidity < 0 || solidity > 100)
    {
        throw new System.ArgumentOutOfRangeException("solidity");
    }

    List<byte> blockData = new List<byte>();
    blockData.AddRange(new byte[] { 0, 0, 0, 1 });

    foreach (var c in colors)
    {
        switch (c.ColorSpace)
        {
            case ColorSpace.Rgb:
                {
                    var color = c as RgbColor;
                    blockData.AddRange(new byte[] { 0, (byte)AdobeColorSpace.RGB });
                    blockData.AddRange(new byte[] { color.R, 0 });
                    blockData.AddRange(new byte[] { color.G, 0 });
                    blockData.AddRange(new byte[] { color.B, 0 });
                    blockData.AddRange(new byte[] { 0, 0 });
                    break;
                }

            case ColorSpace.Cmyk:
                {
                    var color = c as CmykColor;
                    blockData.AddRange(new byte[] { 0, (byte)AdobeColorSpace.CMYK });
                    blockData.AddRange(new byte[] { (byte)(255 - color.C), 0 });
                    blockData.AddRange(new byte[] { (byte)(255 - color.M), 0 });
                    blockData.AddRange(new byte[] { (byte)(255 - color.Y), 0 });
                    blockData.AddRange(new byte[] { (byte)(255 - color.K), 0 });
                    break;
                }

            case ColorSpace.Lab:
                {
                    var color = c as LabColor;
                    blockData.AddRange(new byte[] { 0, (byte)AdobeColorSpace.LAB });

                    var l = (ushort)(color.L / 2.55f * 100f);
                    blockData.AddRange(new byte[] { (byte)(l >> 8), (byte)(l & 255) });

                    var a = (ushort)(short)(color.A * 100);
                    blockData.AddRange(new byte[] { (byte)(a >> 8), (byte)(a & 255) });

                    var b = (ushort)(short)(color.B * 100);
                    blockData.AddRange(new byte[] { (byte)(b >> 8), (byte)(b & 255) });

                    blockData.AddRange(new byte[] { 0, 0 });
                    break;
                }

            case ColorSpace.Grayscale:
                {
                    var gray = c as GrayscaleColor;
                    blockData.AddRange(new byte[] { 0, (byte)AdobeColorSpace.Grayscale });

                    var l = (ushort)((255 - gray.L) / 2.55f * 100f);
                    blockData.AddRange(new byte[] { (byte)(l >> 8), (byte)(l & 255) });

                    blockData.AddRange(new byte[] { 0, 0 });
                    blockData.AddRange(new byte[] { 0, 0 });
                    blockData.AddRange(new byte[] { 0, 0 });

                    break;
                }

            default:
                throw new System.ArgumentException("Invalid color space");
        }

        blockData.AddRange(new byte[] { solidity, 0 });
        blockData.Add((byte)DisplayInfoMode.Spot);
    }

    return new AdobeResourceBlock(string.Empty, blockData.ToArray());
}

Output

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