L_SwapColors

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#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_SwapColors(pBitmap, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_UINT32 uFlags;	/* flag */

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.

Returns

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

Comments

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

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.

See Also

Functions:	L_ConvertToColoredGray, L_BalanceColors, L_GrayScaleBitmap, L_GrayScalebitmapExt, L_IsGrayScaleBitmap, L_AdjustBitmapTint, L_ColorHalfToneBitmap
Topics:	Correcting Colors
	Raster Image Functions: Modifying Intensity Values
	Raster Image Functions: Correcting Colors

Example

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

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


 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("IMAGE1.CMP")), &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 
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);  
   return SUCCESS;
}