#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_SwapColors(pBitmap, uFlags)


pointer to the bitmap handle

L_UINT32 uFlags;


Swaps the specified color channels.

Parameter Description
pBitmap Pointer to the bitmap handle that references the bitmap in which to swap the specified color channels.
uFlags Flag that indicates which color channels to swap. Possible values are:
  Value Meaning
  SWAP_RG Swap the red and green channels. (Change red to green and green to red.)
  SWAP_RB Swap the red and blue channels. (Change red to blue and blue to red.)
  SWAP_GB Swap the green and blue channels. (Change green to blue and blue to green.)
  SWAP_RGBR Change red to green, green to blue and blue to red.
  SWAP_RBGR Change red to blue, blue to green and green to red.



The function was successful.

< 1

An error occurred. Refer to Return Codes.


This function changes the bitmap data.

This function can process the whole image or a region of the image.

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.

Required DLLs and Libraries


For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.


Win32, x64, Linux.

See Also


L_ConvertToColoredGray, L_BalanceColors, L_GrayScaleBitmap, L_GrayScalebitmapExt, L_IsGrayScaleBitmap, L_AdjustBitmapTint, L_ColorHalfToneBitmap


Correcting Colors


Raster Image Functions: Modifying Intensity Values


Raster Image Functions: Correcting Colors


This example assumes there is a bitmap loaded into Bitmap, which is of type BITMAPHANDLE.

L_INT SwapColorsExample(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("cannon.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet = L_SwapColors(&LeadBitmap, SWAP_RG); 
   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  
   return SUCCESS; 

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