L_AddBitmapNoise
#include "l_bitmap.h"
L_LTIMGEFX_API L_INT L_AddBitmapNoise(pBitmap, uRange, uChannel)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_UINT uRange; |
/* percentage of coverage */ |
L_UINT uChannel; |
/* color plane constant */ |
Adds random pixels to a bitmap, letting you specify the percentage of coverage and the color plane.
Parameter |
Description |
|
pBitmap |
Pointer to the bitmap handle referencing the bitmap to process. |
|
uRange |
Percentage of coverage, expressed in tenths of a percent. Valid values are 0 to 1000. |
|
uChannel |
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. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
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.
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.
Use this function in order to add random noise to a bitmap.
Use the L_PerlinBitmap 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 L_PerlinBitmap function.
Use the L_CloudsBitmap function in order to use Perlin equations to generate pseudo-random noise, and then procedurally transform that noise into a cloud-like texture. The L_CloudsBitmap function applies equations to the Perlin noise that are different than those used by the L_PerlinBitmap 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
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
Windows 2000 / XP/Vista.
See Also
Example
For complete sample code, refer to the CHILD.C module of the DEMO example. This example loads a bitmap and adds red noise to it.
L_INT AddBitmapNoiseExample(L_VOID) { L_INT nRet; BITMAPHANDLE LeadBitmap; /* Bitmap handle to hold the loaded image. */ /* Load the bitmap, keeping the bits per pixel of the file */ nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE1.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); if(nRet !=SUCCESS) return nRet; /* Add red noise with 25 percent coverage */ nRet = L_AddBitmapNoise(&LeadBitmap, 250, CHANNEL_RED); if(nRet !=SUCCESS) return nRet; nRet = L_SaveBitmap(TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\Result.BMP"), &LeadBitmap, FILE_BMP, 24, 0, NULL); if(nRet !=SUCCESS) return nRet; //free bitmap if(LeadBitmap.Flags.Allocated) L_FreeBitmap(&LeadBitmap); return SUCCESS; }