LBitmap::AddNoise

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#include "ltwrappr.h"

virtual L_INT LBitmap::AddNoise(uRange=500, uChannel=CHANNEL_MASTER, uFlags = 0)

L_UINT uRange;	/* percentage of coverage */
L_UINT uChannel;	/* color plane constant */
L_UINT32 uFlags;	/* flags */

Adds random pixels to a bitmap, letting you specify the percentage of coverage and the color plane.

Parameter	Description
uRange	Percentage of coverage, expressed in tenths of a percent. Valid values are 0 to 1000.
uChannel	Color plane constant. This plane will be affected by the noise. Possible values are:
	Value	Meaning
	CHANNEL_MASTER	[0] All channels.
	CHANNEL_RED	[1] Red channel only.
	CHANNEL_GREEN	[2] Green channel only.
	CHANNEL_BLUE	[3] Blue channel only.
uFlags	Reserved for future use. Must be 0.

Returns

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

Comments

Use this function in order to add random noise to a bitmap.

Use the LBitmap::Perlin function to use a pseudo-random number generator in order to create a Perlin noise, and then procedurally transform that noise into a texture. Depending on the flags that are set, the texture can be saved as a bitmap by itself, or the texture can be combined with another bitmap. For more information, refer to Using the LBitmap::Perlin Function.

Use the LBitmap::Clouds function in order to use Perlin equations to generate pseudo-random noise, and then procedurally transform that noise into a cloud-like texture. The LBitmap::Clouds function applies equations to the Perlin noise that are different than those used by the LBitmap::Perlin function.

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

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.

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

LTDIS
LTFIL
LTIMGEFX

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

Win32, x64.

See Also

Functions:	LBitmap::BricksTexture, LBitmap::Deskew, LBitmap::DiffuseGlow, LBitmap::GlowFilter, LBitmap::HalfTonePattern, LBitmap::HighPassFilter, LBitmap::MaskConvolution, LBitmap::Perspective, LBitmap::PlasmaFilter, LBitmap::Pointillist, LBitmap::Sharpen, LBitmap::Posterize, LBitmap::Mosaic, LBitmap::Emboss, LBitmap::AverageFilter, LBitmap::MedianFilter, LBitmap::IntensityDetect, LBitmap::SpatialFilter, LBitmap::BinaryFilter, LBitmap::MaxFilter, LBitmap::MinFilter, LBitmap::Oilify, LBitmap::Solarize, LBitmap::WindowLevel, LBitmap::WindowLevelExt, Class Members
Topics:	Raster Image Functions: Filtering Images
	Applying Artistic Effects

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName
L_INT LBitmap__AddNoiseExample()
{
   L_INT nRet;
   LBitmap m_Bitmap;
   
   nRet =m_Bitmap.Load(MAKE_IMAGE_PATH(TEXT("Image1.cmp")), 0,ORDER_BGR);
   if(nRet !=SUCCESS)
      return nRet;
   nRet =m_Bitmap.AddNoise();
   if(nRet !=SUCCESS)
      return nRet;
   return SUCCESS;
}