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LBitmapBase::EnableUseLUT

Summary

Enables or disables the use of LUT.

Syntax

#include "ltwrappr.h"

L_BOOL LBitmapBase::EnableUseLUT(bEnable = TRUE)

Parameters

L_BOOL bEnable

Flag that indicates when the LUT is used. Possible values are:

Value	Meaning
TRUE	The LUT is used in all image processing functions, including save. (default).
FALSE	The LUT is used only when painting. It is ignored when an image processing function is applied or when a file is saved.

Returns

The previous setting.

Required DLLs and Libraries

LTDIS
LTFIL
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

L_INT LBitmapBase__EnableUseLUTExample() 
{ 
    
   RGBQUAD * pLUT; 
   L_INT nRet; 
   L_INT nMin, nMax; 
   L_INT nLowBit, nHighBit; 
   LBitmap myBitmap; 
   L_INT nLUTLen = 0; 
 
   nRet =myBitmap.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Beauty16.jpg")),16); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet =myBitmap.GetMinMaxBits(&nLowBit,&nHighBit); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =myBitmap.GetMinMaxVal(&nMin, &nMax); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* allocate the lookup table */ 
   nLUTLen = 1<<(nHighBit - nLowBit + 1); 
   pLUT = (RGBQUAD *)malloc(sizeof(RGBQUAD) * nLUTLen); 
 
 
  /* fill the LUT with a color gradient */ 
   /* fill the LUT with a color gradient */ 
   nRet =myBitmap.WindowLevelFillLUT((RGBQUAD *)pLUT, 
                              nLUTLen, 
                              RGB(255,0,0), /* RED */ 
                              RGB(0,0,255), /* BLUE */ 
                              nLowBit, /* Starting value */ 
                              nLUTLen, /* Ending value */ 
                              nLowBit, /* Bitmap's LowBit */ 
                              nHighBit, /* Bitmap's HighBit */ 
                              nMin, /* Bitmap's MinVal */ 
                              nMax, /* Bitmap's MaxVal */ 
                              0, /*nFactor*/  
      FILLLUT_INSIDE | FILLLUT_LINEAR) /* Fill Inside range */; 
    
   if(nRet !=SUCCESS) 
      return nRet; 
 
   myBitmap.GetHandle()->LUTLength = nLUTLen; 
   myBitmap.GetHandle()->pLUT = (RGBQUAD *)GlobalAllocPtr(GHND,sizeof(RGBQUAD) * nLUTLen); 
   memcpy(myBitmap.GetHandle()->pLUT,pLUT,sizeof(RGBQUAD) * nLUTLen); 
   myBitmap.EnableUseLUT(TRUE); 
   nRet =myBitmap.ColorRes(24,CRF_BYTEORDERBGR|CRF_FLOYDSTEINDITHERING); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* free the table */ 
    free(pLUT); 
    
   if(myBitmap.GetHandle()->pLUT) 
   { 
      GlobalFree(myBitmap.GetHandle()->pLUT); 
      myBitmap.GetHandle()->LUTLength = 0; 
   } 
 
   return SUCCESS; 
}