L_GetMinMaxBits

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#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_GetMinMaxBits(pBitmap, pLowBit, pHighBit, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT *pLowBit;	/* address of a low bit variable to be updated */
L_INT *pHighBit;	/* address of a high bit variable to be updated */
L_UINT32 uFlags;	/* flags */

Returns the low and high bits of the values present in a 12 or 16-bit grayscale and 48 and 64-bit image.

Parameter	Description
pBitmap	Pointer to the bitmap handle of a 12-bit or 16-bit grayscale and 48 and 64-bit bitmap.
pLowBit	Address of a variable that will be updated with the lowest bit set in the bitmap.
pHighBit	Address of a variable that will be updated with the highest bit set in the bitmap.
uFlags	Reserved for future use. Must be 0.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

The minimum and maximum bit values can be used to specify the range of useful bits and to create a lookup table, for use in L_WindowLevel or L_WindowLevelBitmap.

This function supports 12 and 16-bit grayscale. Support for 12 and 16-bit grayscaleimages is available in the Document and Medical Imaging toolkits.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGCOR

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, Linux.

See Also

Functions:	L_GetMinMaxVal, L_WindowLevel, L_WindowLevelBitmap
Topics:	Raster Image Functions: Palettes
	Color Halftone and Halftone Images
	Grayscale Images
	Raster Image Functions: Processing an Image

Example

This example gets the minimum and maximum bits for an image.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


#if defined (LEADTOOLS_V16_OR_LATER)
 L_INT GetMinMaxBitsExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle of the image. */
   L_INT nLowBit; /* the low bit variable */
   L_INT nHighBit; /* the high bit variable */
   
   /* Load the bitmap, keeping the bits per pixel of the file */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\brain.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;

   /* get min/max bits */
   nRet = L_GetMinMaxBits(&LeadBitmap, &nLowBit, &nHighBit, 0);
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   //free Bitmap
   if(LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}
#else
 L_INT GetMinMaxBitsExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle of the image. */
   L_INT nLowBit; /* the low bit variable */
   L_INT nHighBit; /* the high bit variable */
   
   /* Load the bitmap, keeping the bits per pixel of the file */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\brain.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;

   /* get min/max bits */
   nRet = L_GetMinMaxBits(&LeadBitmap, &nLowBit, &nHighBit);
   if(nRet !=SUCCESS)
      return nRet;
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   //free Bitmap
   if(LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}
#endif // LEADTOOLS_V16_OR_LATER