L_ColorIntensityBalance

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_ColorIntensityBalance(pBitmap, pShadows, pMidTone, pHighLight, bLuminance)

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

LPBALANCEDATA pShadows;

/* pointer to Shadows information */

LPBALANCEDATA pMidTone;

/* pointer to Midtones information */

LPBALANCEDATA pHighLight;

/* pointer to Highlights information */

L_BOOL bLuminance;

/* value that indicates whether to preserve luminance */

Changes the distribution of the red, green, or blue channels. This function is available in the Raster Pro and above toolkits.

Parameter

Description

pBitmap

Pointer to the bitmap handle that references the bitmap on which to apply the effect.

pShadows

Pointer to structure used to adjust the dark tones.

pMidTone

Pointer to structure used to adjust the medium tones (midtones).

pHighLight

Pointer to structure used to adjust the bright tones (highlights).

bLuminance

Value that indicates whether to preserve luminance. Possible values are:

 

Value

Meaning

 

TRUE

Preserve luminance.

 

FALSE

Do not preserve luminance.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

This function changes the distribution of the red, green, or blue channels to make the colors in an image more accurate or more different.

Each color component is treated independently. The color range for each component is split into Shadows, Midtones and Highlights based on the intensity. The values in each range are adjusted differently using the BALANCEDATA structures. Positive values from BALANCEDATA for a component cause that particular component to become brighter, whereas negative values cause the component to become darker. A value of 0 leaves the component unchanged.

The preserve luminance option aims to minimize the luminance change in the image.

This function supports only RGB images. It does not support grayscale images.

This function supports 48 and 64-bit color images. Support for 48 and 64-bit color images is available only in the Document/Medical toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

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.

Required DLLs and Libraries

LTIMG

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

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:

L_ConvertToColoredGray, L_GrayScaleBitmap, L_GrayScaleBitmapExt, L_IsGrayScaleBitmap. L_SharpenBitmap, L_PosterizeBitmap, L_MosaicBitmap, L_EmbossBitmap, L_MedianFilterBitmap, L_AddBitmapNoise, L_IntensityDetectBitmap, L_SpatialFilterBitmap, L_BinaryFilterBitmap, L_MaxFilterBitmap, L_MinFilterBitmap, L_OilifyBitmap, L_SolarizeBitmap, L_WindowLevel, L_AutoColorLevelBitmap, L_ColorLevelBitmap, L_SelectiveColorBitmap, L_AdjustBitmapTint, L_ColorHalfToneBitmap

Topics:

Correcting Colors

 

Raster Image Functions: Modifying Intensity Values

 

Raster Image Functions: Correcting Colors

Example

BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
BALANCEDATA   Shadows; 
BALANCEDATA   MidTone; 
BALANCEDATA   HighLight; 

Shadows.uStructSize  = sizeof(BALANCEDATA); 
Shadows.nRed = 60; 
Shadows.nGreen = 0; 
Shadows.nBlue = 0; 

MidTone.uStructSize  = sizeof(BALANCEDATA); 
MidTone.nRed = 40; 
MidTone.nGreen = 0; 
MidTone.nBlue = 0; 

HighLight.uStructSize = sizeof(BALANCEDATA); 
HighLight.nRed = 70; 
HighLight.nGreen  = 0; 
HighLight.nBlue = 0; 

/* Load a bitmap at its own bits per pixel  */
L_LoadBitmap (TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
/* Balance the colors by increasing the red channel values */
L_ColorIntensityBalance(&LeadBitmap, &Shadows, &MidTone, &HighLight, 
FALSE);