L_ChannelMix

#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_ChannelMix(pBitmap, pRedFactor, pGreenFactor, pBlueFactor, uFlags)

Redistributes the RGB values of the specified bitmap, using the values stored in the specified structures.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap which will undergo color redistribution.

COLORDATA *pRedFactor

Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's red values.

COLORDATA *pGreenFactor

Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's green values.

COLORDATA *pBlueFactor

Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's blue values.

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 does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function is used to rebalance the colors in a bitmap. It can be used to make color adjustments and corrections.

This function supports 1-, 2-, 3-, 4-, 5-, 6-, 7-, 8-, 24-, 48- and 64-bit bitmaps and can support regions for 24-, 48- and 64-bit bitmaps. If the bitmap has a region, the effect will be applied on the region only.

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

Platforms

Win32, x64, Linux.

See Also

Functions

Topics

Example

The following example loads a bitmap and then applies the L_ChannelMix function to it:

L_INT ChannelMixExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE Bitmap; 
   COLORDATA RedFact, GreenFact, BlueFact; 
 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &Bitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   RedFact.uStructSize = sizeof(COLORDATA); 
   RedFact.nRedFactor = 50; 
   RedFact.nGreenFactor = 0; 
   RedFact.nBlueFactor = 0; 
   RedFact.nConstant = 0; 
 
   GreenFact.uStructSize = sizeof(COLORDATA); 
   GreenFact.nRedFactor = 100; 
   GreenFact.nGreenFactor = 100; 
   GreenFact.nBlueFactor = 0; 
   GreenFact.nConstant = 0; 
 
   BlueFact.uStructSize = sizeof(COLORDATA); 
   BlueFact.nRedFactor = 0; 
   BlueFact.nGreenFactor = 0; 
   BlueFact.nBlueFactor = 100; 
   BlueFact.nConstant = 0; 
 
   nRet = L_ChannelMix(&Bitmap,&RedFact,&GreenFact,&BlueFact, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &Bitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free bitmap  
   if(Bitmap.Flags.Allocated)   
      L_FreeBitmap(&Bitmap);   
   return SUCCESS; 
} 

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