How to import TIF into DICOM in DicomObjects

In DicomObjects CLR 4.8 version, TIF is natively supported by System.Drawing. In DicomObjects Core 5/8 verison, as we use SkiaSharp imaging library which does not support TIF, a bit of a user code is required.

The following sample code demonstrates how to import TIF into DicomImage object in both versions of DicomObjects.

DicomObjects.NET 4.8

DicomImage class

 DicomImage image = new DicomImage();
 image.Import(tif_file_path);

DicomDataSet class

 DicomDataSet ds = new DicomDataSet();
 ds.Import(tif_file_path);

DicomObjects.Core 5/8

DicomImage class with BitMiracle.LibTiff library

public static DicomImageCollection ImportTiffR(Stream tiffStream)
{
    DicomImageCollection results = new DicomImageCollection();
    // open a Tiff stored in the memory stream, and grab its pixels
    using Tiff tifImg = Tiff.ClientOpen("", "r", tiffStream, new TiffStream());
    if (tifImg == null)
        throw new DataException("Could not open incoming image");
    int pageCount = 0;
    do
    {
        // Read the width and height of the current page
        int width = tifImg.GetField(TiffTag.IMAGEWIDTH)[0].ToInt();
        int height = tifImg.GetField(TiffTag.IMAGELENGTH)[0].ToInt();
        // Read raster data
        int[] raster = new int[width * height];
        if (!tifImg.ReadRGBAImageOriented(width, height, raster, Orientation.TOPLEFT))
            throw new InvalidDataException($"Invalid TIF image {pageCount}"); // Not a valid TIF image
        // store the pixels
        var pixels = new SKColor[width * height];
        for (int y = 0; y < height; y++)
            for (int x = 0; x < width; x++)
            {
                int arrayOffset = y * width + x;
                int rgba = raster[arrayOffset];
                pixels[arrayOffset] = new SKColor((byte)Tiff.GetR(rgba), (byte)Tiff.GetG(rgba), 
                	(byte)Tiff.GetB(rgba), (byte)Tiff.GetA(rgba));
            }
        using SKBitmap bitmap = new SKBitmap(width, height);
        bitmap.Pixels = pixels;
        results.Add(new DicomImage(bitmap));
    } 
    while (tifImg.ReadDirectory()); // Move to the next page    
    return results;
}