L_DiffuseGlowBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_DiffuseGlowBitmap(pBitmap, nGlowAmount, uClearAmount, uSpreadAmount, uWhiteNoise, crGlowColor)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT nGlowAmount;	/* glow intensity */
L_UINT uClearAmount;	/* clear amount */
L_UINT uSpreadAmount;	/* glow spread amount */
L_UINT uWhiteNoise;	/* amount of noise */
COLORREF crGlowColor;	/* glow color */

Adds a colored glow to a bitmap's light or dark areas, making these areas shine with a neon glow. 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.
nGlowAmount	Glow intensity, expressed in tenths of a percent. Possible values range from -1000 – 1000. Use positive values to add glow to the brighter regions of the image, and negative values to add glow to the darker regions of the image.
uClearAmount	Value that represents how deeply the glow will penetrate into the non-glowing areas, expressed in tenths of a percent. Possible values range from 0 – 1000. A value of 0 indicates total glow diffusion, whereas a value of 1000 indicates the glow does not penetrate into any of the non-glowing areas.
uSpreadAmount	Value that represents the amount of blur in the glow diffusion, from 0 to 100 pixels. Possible values range from 0 – 1000. A value of 0 indicates none of the glow is diffused, whereas a value of 1000 indicates maximum diffusion.
uWhiteNoise	Percent of the bitmap to be covered with added pixels, expressed in tenths of a percent. The pixels will be added randomly. Possible values range from 0 – 1000.
crGlowColor	The COLORREF value that specifies the glow color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

Returns

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

Comments

This filter adds pixels randomly to the bitmap. A glow is added based on a combination of the pixel colors and the glow color.

As an example, if you use the following image:

$image\diffuseglowbefore.gif$

And you were to call L_DiffuseGlowBitmap using the following settings:

Parameter	Value
nGlowAmount	50
uClearAmount	50
uSpreadAmount	10
uWhiteNoise	10
crGlowColor	white

The following figure results:

$image\diffuseglow.gif$

If the bitmap has a region, the effect will be applied on the region only.

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.

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_AddBitmapNoise, L_EmbossBitmap, L_MosaicBitmap, L_MotionBlurBitmap, L_OilifyBitmap, L_PosterizeBitmap, L_RemoveRedeyeBitmap, L_SolarizeBitmap, L_UnderlayBitmap, L_BumpMapBitmap, L_CubismBitmap, L_DrawStarBitmap, L_FreePlaneBendBitmap, L_FreeRadBendBitmap, L_DryBitmap, L_GlowFilterBitmap, L_OceanBitmap, L_GlassEffectBitmap, L_LensFlareBitmap, L_LightBitmap, L_PlaneBendBitmap, L_PlaneBitmap, L_SampleTargetBitmap, L_TunnelBitmap, L_BendingBitmap, L_CylindricalBitmap, L_FreeHandShearBitmap, L_FreeHandWaveBitmap, L_ImpressionistBitmap, L_PixelateBitmap, L_PolarBitmap, L_PunchBitmap, L_RadialBlurBitmap, L_RadWaveBitmap, L_RippleBitmap, L_SpherizeBitmap, L_SwirlBitmap, L_WaveBitmap, L_WindBitmap, L_ZoomBlurBitmap, L_ZoomWaveBitmap
Topics:	Raster Image Functions: Filtering Images
	Raster Image Functions: Artistic Effects
	Applying Artistic Effects
	Detecting and Enhancing Edges and Lines
	Raster Image Functions: Detecting and Enhancing Edges and Lines

Example

BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
/* Load a bitmap at its own bits per pixel */
L_LoadBitmap (TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Add Diffuse Glow to the image*/
L_DiffuseGlowBitmap(&LeadBitmap, 500, 500, 200, 50, RGB(255, 255, 255));