LBitmap::AddShadow

#include "ltwrappr.h"

virtual L_INT LBitmap::AddShadow (uAngle, uThreshold, uFlags)

L_UINT uAngle;	/* shadow or light direction */
L_UINT uThreshold;	/* threshold value */
L_UINT uFlags;	/* flag */

Adds shadows to the bitmap.

Parameter	Description
uAngle	Angle value indicating the direction of the light source producing the shadow. Possible values are:
	Value	Meaning
	SHADOW_E	[0] East
	SHADOW_NE	[1] Northeast
	SHADOW_N	[2] North
	SHADOW_NW	[3] Northwest
	SHADOW_W	[4] West
	SHADOW_SW	[5] Southwest
	SHADOW_S	[6] South
	SHADOW_SE	[7] Southeast
uThreshold	Threshold value used to determine which pixels will be affected . Valid values range from 0 through 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 through 4095 for 12-bit grayscale images. Otherwise, it is from 0 through 255. When uFlags = COLOR_RGB, any component (R, G, or B) of a pixel with a value less than the uThreshold value is not affected. When uFlags = COLOR_GRAY, any pixel where the master channel value is less than the uThreshold value is not affected.
uFlags	Type of the shadow. Possible values are:
	Value	Meaning
	SHADOW_CLR_RGB	[0] Shadows are colored.
	SHADOW_CLR_GRAY	[1] Shadows are grayscale.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function applies a convolution matrix upon each color component and then combines the results in order to add shadows.

Support for 12 and 16-bit grayscale and 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 LBase::EnableStatusCallback.

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 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

LTIMGSFX

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

See Also

Functions:	LBitmap::BricksTexture, LBitmap::Deskew, LBitmap::DeskewExt, LBitmap::DiffuseGlow, LBitmap::GlowFilter, LBitmap::HalfTonePattern, LBitmap::HighPassFilter, LBitmap::MaskConvolution, LBitmap::Perspective, LBitmap::PlasmaFilter, LBitmap::Pointillist, LBitmap::EdgeDetector, LBitmap::LensFlare, LBitmap::Light, LBitmap::AllocFTArray, LBitmap::ChangeHueSatInt, LBitmap::ColorReplace, LBitmap::ColorThreshold, LBitmap::DFT, LBitmap::DirectionEdgeStatistical, LBitmap::FFT, LBitmap::FreeFTArray, LBitmap::FrqFilter, LBitmap::FrqFilterMask, LBitmap::FTDisplay, LBitmap::GetStatisticsInfo, LBitmap::GetFeretsDiameter, LBitmap::GetObjectInfo, LBitmap::GetRgnContourPoints, LBitmap::GetRgnPerimeterLength, LBitmap::MathFunction, LBitmap::RevEffect, LBitmap::Segment, LBitmap::SubtractBackground, LBitmap::UserFilter, LBitmap::EdgeDetector2, LBitmap::DirectionEdgeStatistical2, LBitmap::DeskewCheck
Topics:	Raster Image Functions: Artistic Effects
	Applying Artistic Effects

Example

L_INT LBitmap__AddShadowExample(LBitmap *pLeadBitmap) 
{
   
   /* Apply  shadow effect  to the image*/
   return pLeadBitmap->AddShadow (SHADOW_SE, 0, SHADOW_CLR_GRAY); 
}