L_SelectBitmapData

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_SelectBitmapData (pDstBitmap, pSrcBitmap, crColor, uSrcLowBit, uSrcHighBit, uThreshold, bCombine, uFlags)

pBITMAPHANDLE pDstBitmap;	pointer to the destination bitmap handle
pBITMAPHANDLE pSrcBitmap;	pointer to the source bitmap handle
COLORREF crColor;	color value that will be used for coloration
L_UINT uSrcLowBit;	position of the starting bit of the mask
L_UINT uSrcHighBit;	position of the ending bit of the mask
L_UINT uThreshold;	threshold value
L_BOOL bCombine;	flag
L_UINT32 uFlags;	flags

Selects a specified number of bits of an 8, 12 or 16-bit grayscale bitmap and puts them into a mask, then colors the bitmap depending on the mask. This can show bitmap variances depending on user-defined conditions.

It also can process the whole image or a region of the image. If a bitmap has a region, the effect is applied only to the region.

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.

Parameter	Description
pDstBitmap	Pointer to the destination bitmap that will contain the result of the function. This bitmap will be updated as a 24-bit RGB. The bitmap is assumed to be uninitialized, so you should free the bitmap before passing it to the function.
pSrcBitmap	Pointer to the bitmap handle referencing the 8, 12 or 16-bit grayscale bitmap. pSrcBitmap will not be affected.
crColor	Color that will be used for showing the variances in the bitmap.
uSrcLowBit	Position of the start bit that will construct the mask. The position is a zero based number.
uSrcHighBit	Position of the end bit that will construct the mask. This is inclusive (it is part of the mask). The value should not be less than uSrcLowBit. You can also pass 1, which is interpreted as "highest bit" (pSrcBitmap->BitsPerPixel 1).
uThreshold	Value that indicates the threshold for showing the bitmap variances. If the mask value is greater or equal to the threshold value then the pixel will be colored using crColor. See bCombine for more details.
bCombine	A flag which tells how to color the output pixels:
	- Pixels with values greater than or equal to the threshold value are:
	set to crColor (if bCombine is set to FALSE) or
	AND-ed with crColor (if bCombine is TRUE). In this case, the source pixel is first converted to grayscale 24-bit and then AND-ed with crColor.
	- Pixels with values less than the threshold value are:
	set to black (if bCombine is set to FALSE) or
	The RGB pixel value will be the same as the high byte source pixel value (if bCombine is TRUE). That is R = G = B = High byte values of the source pixel.
uFlags	Reserved for future use. Must be 0.

Returns

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

Required DLLs and Libraries

LTIMGCOR

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, Linux.

Example

This example loads a bitmap and applies Selecting.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
L_INT SelectBitmapDataExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
   BITMAPHANDLE DstBitmap;     /* Bitmap handle to hold the result. */ 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("Slice.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   // Call the function 
   nRet =L_SelectBitmapData (&DstBitmap, 
   &LeadBitmap, 
   RGB(233, 10, 77), 
   2 /* uSrcLowBit */, 
   6 /* uSrcHighBit */, 
   25 /* uThreshold */, 
   TRUE, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
   // Now we have the resulted image in DstBitmap 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &DstBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free bitmap 
   if(DstBitmap.Flags.Allocated) 
      L_FreeBitmap(&DstBitmap); 
   if(LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap); 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Raster Imaging C API Help

Introduction

Version History

Getting Started

LEADTOOLS Raster Imaging Features

Redistributables/Files To Be Included With Your Application

Functions:	L_WindowLevel, L_WindowLevelBitmap, L_GrayScaleToDuotone, L_GrayScaleToMultitone, L_ShiftBitmapData, L_ColorizeGrayBitmap, L_SelectiveColorBitmap, L_AdjustBitmapTint, L_ColorHalfToneBitmap
Topics:	Raster Image Functions: Modifying Intensity Values
	Grayscale Images
	Using Color Values in LEADTOOLS
	Color Halftone and Halftone Images
	Raster Image Functions: Correcting Colors