SetTransferFunction(Single,Single,Color[]) Method

In This Topic

Set the transfer function (Colour Map) for use in Volume Rendering

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Sub SetTransferFunction( _
   ByVal Min As System.Single, _
   ByVal Max As System.Single, _
   ByVal Colours() As System.Drawing.Color _
)

public void SetTransferFunction( 
   System.float Min,
   System.float Max,
   System.Drawing.Color[] Colours
)

Parameters

Min: The pixel value to be mapped to the first element of the Colours array
Max: The pixel value to be mapped to the last element of the Colours array
Colours: An array of Color values

Remarks

The alpha values are central to Volume rendering, and it is important that "transparent" pixel ranges should be to colours with an alpha value < 1.

Pixel values less than the Min value are mapped to the first colour in the array and those greater than the Max value are mapped to the last value.

Example

DicomImage image = new DicomImage("your_3D_dicom_image.dcm");
DicomVolume volume = new DicomVolume(image);
                    
RenderMode3D renderMode = RenderMode3D.MPR;
DicomImage3D image3D = new DicomImage3D(volume, renderMode);
       
// Typical pixel range for 12 bit CT
float minPixelValue = -1024;
float maxPixelValue = 3071;
                    
Color[] colorMap = new Color[]
{
    Color.FromArgb(0, 0, 0, 0), // Fully transparent black (Air)
    Color.FromArgb(50, 0, 0, 255), // Slightly visible blue
    Color.FromArgb(100, 0, 255, 0), // Green (soft tissue)
    Color.FromArgb(200, 255, 0, 0), // Red (high-intensity structures)
    Color.FromArgb(255, 255, 255, 255) // Fully opaque white (Bone)
};    
            
image3D.SetTransferFunction(minPixelValue, maxPixelValue, colorMap);
Viewer.Images.Add(image3D);

Requirements

Target Platforms: .NET CLR 4.8 or higher

Reference

DicomImage3D Class
DicomImage3D Members
Overload List

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