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. This function is available in the Raster Pro and above toolkits.

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.

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.

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::ChangeHueSatIntBitmap, 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
Topics:	Raster Image Functions: Artistic Effects
	Applying Artistic Effects

Example

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