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L_GetBitmapColorCount

Summary

Gets the number of unique colors in an image.

Syntax

#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_GetBitmapColorCount(pBitmap, puCount, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap.

L_UINT * puCount

Address of the variable to be updated with the number of unique colors.

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

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

This function supports 32-bit grayscale images.

Required DLLs and Libraries

LTIMGCLR
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 displays the number of unique colors in the specified bitmap.

L_INT  GetBitmapColorCountExample(L_VOID) 
{ 
   L_INT          nRet; 
   L_TCHAR        szMessage[80]; /* Buffer for the MessageBox string */ 
   L_UINT32       dwColors;      /* Number of colors in the bitmap */ 
   BITMAPHANDLE   LeadBitmap; 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("Master.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Get the number of colors in the bitmap */ 
   nRet = L_GetBitmapColorCount(&LeadBitmap, &dwColors, 0); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Display the result in a message */ 
   wsprintf(szMessage, TEXT("NOTE: The bitmap has %ld colors\n"), dwColors); 
   _tprintf(_T("%s"), szMessage); 
 
   return SUCCESS; 
}