L_ChangeBitmapIntensity

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_ChangeBitmapIntensity(pBitmap, nChange)

pBITMAPHANDLE pBitmap;

/* pointer to the bitmap handle */

L_INT nChange;

/* amount to change the intensity */

Changes the intensity (brightness) of the image in a bitmap.

Parameter

Description

pBitmap

Pointer to the bitmap handle referencing the bitmap to change.

nChange

Amount to change the intensity. The intensity ranges from -1000 to 1000. A positive value increases (or lightens) the brightness of the bitmap image. A negative values decreases (or darkens) the brightness of the bitmap image.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

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

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 only in the Document/Medical toolkits.

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, Windows CE.

See Also

Functions:

L_GammaCorrectBitmap, L_ChangeBitmapContrast,

 

L_HistoContrastBitmap, L_StretchBitmapIntensity,

 

L_RemapBitmapIntensity, L_InvertBitmap,

 

L_ChangeBitmapHue, L_ChangeBitmapSaturation,

 

L_HistoEqualizeBitmap, L_FillBitmap, L_GetPixelColor,

 

L_PutPixelColor, L_GetBitmapHistogram,

 

L_DlgIntensityDetect, L_WindowLevel, L_ChannelMix, L_DeinterlaceBitmap, L_DesaturateBitmap, L_EdgeDetectStatisticalBitmap, L_LightControlBitmap, L_SmoothEdgesBitmap, L_LocalHistoEqualizeBitmap, L_AddWeightedBitmaps, L_ColorMergeBitmap, L_ColorSeparateBitmap, L_ConvertColorSpace, L_MultiplyBitmap, L_AutoColorLevelBitmap, L_ColorLevelBitmap, L_CorrelationBitmap, L_GrayScaleToDuotone, L_GrayScaleToMultitone, L_HolesRemovalBitmapRgn, L_SelectiveColorBitmap, L_SkeletonBitmap, L_ChangeHueSatIntBitmap, L_ColorReplaceBitmap, L_ColorThresholdBitmap, L_MathFunctionBitmap, L_SegmentBitmap, L_AdaptiveContrastBitmap, L_ApplyMathLogicBitmap, L_ColorIntensityBalance, L_ColorizeGrayBitmap, L_ContBrightIntBitmap, L_DigitalSubtractBitmap, L_DynamicBinaryBitmap, L_EdgeDetectEffectBitmap, L_FunctionalLightBitmap, L_MultiScaleEnhancementBitmap, L_SelectBitmapData, L_ShiftBitmapData, L_AdjustBitmapTint, L_GammaCorrectBitmapExt

Topics:

Raster Image Functions: Modifying Intensity Values

 

Changing Brightness and Contrast

 

Raster Image Functions: Changing Brightness and Contrast

Example

For complete sample code, refer to the FEATURE1 example.

/* This example loads a bitmap and increases its intensity. */
BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */
/* Load the bitmap, keeping the bits per pixel of the file */
L_LoadBitmap
 (TEXT("IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Increase the brightness by 25 percent  of the possible range */
L_ChangeBitmapIntensity
(&LeadBitmap, 250 );