Redistributes the RGB values of the specified bitmap, using the values stored in the specified structures.
#include "l_bitmap.h"
L_LTIMGCLR_API L_INT L_ChannelMix(pBitmap, pRedFactor, pGreenFactor, pBlueFactor, uFlags)
Pointer to the bitmap handle that references the bitmap which will undergo color redistribution.
Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's red values.
Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's green values.
Pointer to a COLORDATA structure that contains the values to use for redistributing the bitmap's blue values.
Reserved for future use. Must be 0.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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.
Channel Mixer Function - Before
Channel Mixer Function - After
View additional platform support for this Channel Mixer function.
Win32, x64, Linux.
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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