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SetLookupTable16 Method

Summary
Sets the 16-bit lookup table (LUT) of this RasterImage.
Syntax
C#
Objective-C
C++/CLI
Java
Python
public void SetLookupTable16( 
   RasterColor16[] value 
) 
- (BOOL)setLookupTable16:(nullable NSArray<LTRasterColor16 *> *)lut16 error:(NSError **)error 
public void setLookupTable16(RasterColor16[] value) 
public: 
void SetLookupTable16(  
   array<RasterColor16>^ value 
)  
def SetLookupTable16(self,] value): 

Parameters

value
An array of RasterColor16 structures which represent the lookup table (LUT) of this RasterImage.

Remarks

The lookup table (LUT) is used when the value of UseLookupTable is set to true.

The 8-bit (SetLookupTable) and 16-bit lookup tables are synchronized, so when you change one, the other is changed as well. The 16-bit lookup table has more precision so it is recommended you use the 16-bit LUT instead of the 8-bit LUT.

For more information, refer to Grayscale Images.

Example
C#
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using Leadtools.Svg; 
 
 
public void SetLookupTable() 
{ 
   DicomEngine.Startup(); 
 
   // Create a RasterCodecs class for saving out images 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load a dataset 
   DicomDataSet ds = new DicomDataSet(); 
   ds.Load(Path.Combine(LEAD_VARS.ImagesDir, "DICOM", "image3.dcm"), DicomDataSetLoadFlags.None); 
 
   // Get the image but do NOT auto-apply any of the LUTs 
   DicomElement element = ds.FindFirstElement(null, DicomTag.PixelData, true); 
   RasterImage image = ds.GetImage(element, 0, 16, RasterByteOrder.Gray, DicomGetImageFlags.None); 
   image.UseLookupTable = true; 
 
   // Save out the image without any LUTs applied.  It should be black 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "BeforeSetLookupTable.bmp"), RasterImageFormat.Bmp, 8); 
 
   // Create a LUT 
   RasterColor[] lut = new RasterColor[(int)Math.Pow(2, 16)]; 
 
   // Get the Minimum and Maximum values so we can calculate appropriate LUT values. 
   MinMaxValuesCommand cmdMinMax = new MinMaxValuesCommand(); 
   cmdMinMax.Run(image); 
   int maxVal = cmdMinMax.MaximumValue; 
   int minVal = cmdMinMax.MinimumValue; 
 
   for (int i = 0; i < lut.Length; i++) 
   { 
      lut[i].R = Convert.ToByte(Math.Min(255, ((i - minVal) * 255 / (maxVal - minVal)))); 
      lut[i].G = lut[i].R; 
      lut[i].B = lut[i].R; 
   } 
 
   // Set the new lookup table 
   image.SetLookupTable(lut); 
 
   // Save out the image with the LUT applied.  It should look normal 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "DICOM", "AfterSetLookupTable.bmp"), RasterImageFormat.Bmp, 8); 
 
   DicomEngine.Shutdown(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 23.0.2024.5.22
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.