L_ChannelMix

Summary

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

Syntax

#include "l_bitmap.h"

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

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; 
} 

Help Version 22.0.2022.6.24
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LEADTOOLS Raster Imaging C API Help

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© 1991-2022 LEAD Technologies, Inc. All Rights Reserved.