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L_InvertBitmap

Summary

Inverts the colors in the specified bitmap, making it like a photographic negative.

Syntax

#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_InvertBitmap(pBitmap, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap to be converted.

Returns

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

Comments

This function can also be used to invert the color of a 1-bit image, making the black white and the white black.

This function originally works on the image data, but if the image has an LUT, the function will work on the LUT.

To use this function with data of image that has LUT:

Set the UseLUT flag of pBitmap to FALSE.
Call this function with passing pBitmap.

After applying the function, set the UseLUT back to TRUE.

pBitmap->Flags.UseLUT = FALSE;   
L_InvertBitmap(pBitmap);   
pBitmap->Flags.UseLUT = TRUE;

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function supports signed data images.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images 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.

Invert Function - Before

Invert Function - After

View additional platform support for this Invert function.

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

For complete sample code, refer to the CHILD.C module of the DEMO example.
This example loads a bitmap and inverts it.

L_INT InvertBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("RGSRef.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Invert the colors of the bitmap */ 
   nRet = L_InvertBitmap(&LeadBitmap, 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; 
}