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L_GetMinMaxBits

Summary

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

Syntax

#include "l_bitmap.h"

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

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle of a 12-bit or 16-bit grayscale and 48 and 64-bit bitmap.

L_INT *pLowBit

Address of a variable that will be updated with the lowest bit set in the bitmap.

L_INT *pHighBit

Address of a variable that will be updated with the highest bit set in the bitmap.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

Value	Meaning
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.

Example

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

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("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; 
}