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LDicomDS::GetPaletteColorLUTData

Summary

Retrieves red, green or blue "Palette Color Lookup Table Data".

Syntax

#include "ltdic.h"

L_UINT16 LDicomDS::GetPaletteColorLUTData(pLUTData, uDataSize, PaletteColorLUTType, uFlags)

Parameters

L_UINT16 * pLUTData

Pointer to the buffer to be updated with the "Palette Color Lookup Table Data".

You must allocate the buffer before calling this function, and the buffer must be large enough to hold the "Palette Color Lookup Table Data".

L_UINT uDataSize

Size of the buffer pointed to by pLUTData.

DICOMPALETTECOLORLUTTYPE PaletteColorLUTType

Type of palette color lookup table to data to get. The following are possible values:

Value	Meaning
DICOMPALETTECOLORLUTTYPE_RED	Retrieve "Red Palette Color Lookup Table Data" (0028,1201)
DICOMPALETTECOLORLUTTYPE_GREEN	Retrieve "Green Palette Color Lookup Table Data" (0028,1202)
DICOMPALETTECOLORLUTTYPE_BLUE	Retrieve "Blue Color Lookup Table Data" (0028,1203)

L_UINT uFlags

Reserved for future use. Pass 0.

Returns

Value	Meaning
0	The function was successful.
> 0	An error occurred. Refer to Return Codes.

Comments

This function will retrieve the data for the "Red", "Green" or "Blue" "Palette Color Lookup Table".

If the data is segmented, then this function will decode the data before coping it to the buffer pointed to by pLUTData.

Before calling this function you will need to call LDicomDS::GetPaletteColorLUTAttributes to see if a "Palette Color Lookup Table" exists in the DICOM dataset. If you are trying to retrieve the "Red Palette Color Lookup Table Data" you must allocate a buffer with a size greater or equal to pPaletteColorLUTAttributes->RedLUTDescriptor.uNumberOfEntries, where pPaletteColorLUTAttributes is the "Palette Color Lookup Table" attributes" structure returned by the LDicomDS::GetPaletteColorLUTAttributes function. If you are trying to retrieve the "Green Palette Color Lookup Table Data" you must allocate a buffer with a size greater or equal to pPaletteColorLUTAttributes-> GreenLUTDescriptor.uNumberOfEntries. And, if you are trying to retrieve the "Blue Palette Color Lookup Table Data" you must allocate a buffer with a size greater or equal to pPaletteColorLUTAttributes->BlueLUTDescriptor.uNumberOfEntries.

Required DLLs and Libraries

LTDIC
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application

Platforms

Win32, x64

Example

This example will retrieve the data under
"Red Palette Color Lookup Table Data"(0028,1201)
element and if the data is segmented it will get the data under
"Segmented Red Palette Color Lookup Table Data" (0028,1221) and decode it

L_INT LDicomDS_GetPaletteColorLUTDataExample(LDicomDS    &InDS,//Input dataset 
                                                 L_UINT16*   pLUTDataBuffer,//Buffer which will hold the data 
                                                 L_UINT      uInputBufferSize//Buffer size 
                                                 ) 
{ 
   L_INT nRet; 
 
   // Structure that will hold Palette Color LUT attributes 
 
   DICOMPALCOLORLUTATTRIBS PaletteColorLUTAttributes = {0}; 
 
   // Sanity Check 
 
   if(pLUTDataBuffer== NULL)  
 
   { 
 
      return DICOM_ERROR_NULL_PTR; 
 
   } 
 
   if(uInputBufferSize == 0)  
 
   { 
 
      return DICOM_ERROR_PARAMETER;    
 
   } 
 
   memset(pLUTDataBuffer,0,uInputBufferSize);  
 
   // Get "Palette Color Lookup Table" attributes 
 
   nRet = InDS.GetPaletteColorLUTAttributes (  &PaletteColorLUTAttributes,  
                                             sizeof(DICOMPALCOLORLUTATTRIBS),  
                                             0);    
 
   if(nRet != DICOM_SUCCESS) 
 
   { 
 
      return nRet; 
 
   } 
 
   // The buffer should be big enough to hold the data!  
 
   if(!(uInputBufferSize >= PaletteColorLUTAttributes.RedLUTDescriptor.uNumberOfEntries))  
 
   { 
 
      return DICOM_ERROR_PARAMETER;  
 
   } 
 
   // Retrieve "Red Palette Color Lookup Table Data" 
   // This function will automatically decode the LUT data  
   // if it was segmented 
   return InDS.GetPaletteColorLUTData ( pLUTDataBuffer,  
                                       uInputBufferSize,  
                                       DICOMPALETTECOLORLUTTYPE_RED,  
                                       0);  
 
}