Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
#include "ltwrappr.h"
virtual L_INT LBitmapBase::GrayScale(nBitsPerPixel=8)
L_INT nBitsPerPixel; |
/* number of bits per pixel */ |
Converts a 1-, 4-, 8-, 16-, 24-, or 32-bit bitmap to an 8-bit, 12-bit, 16-bit or 32-bit grayscale bitmap. Support for 12 ,16 and 32-bit grayscale images is available only in the Document/Medical toolkits.
Parameter |
Description |
nBitsPerPixel |
Value indicating the number of bits in the destination bitmap. Valid values are 8, 12, 16, or 32. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
The resulting bitmap can be an 8-bit, 12-bit, ,16-bit or 32-bit grayscale bitmap. Once the function is complete, the Order member of the bitmap handle is set to ORDER_GRAY.
When converting to 12-bit , 16-bit, or 32-bit grayscale, a Lookup table is not used. When converting to 8-bit grayscale, a Lookup table is used to get the RGB for each input pixel. The grayscale value corresponding to that RGB triple is used in the destination bitmap.
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
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
See Also
Element: |
LBitmapBase::IsGrayScale, LBitmapBase::ConvertToGrayScale, Class Members |
Topics: |
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Raster Image Functions: Working with Color Halftones, Halftones, and Grayscale Images |
Example
#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName L_INT LBitmapBase__GrayScaleExample() { L_INT nRet; LBitmapBase MyBitmap; MyBitmap.SetFileName(MAKE_IMAGE_PATH(TEXT("image1.cmp"))); nRet =MyBitmap.Load(24); if(nRet !=SUCCESS) return nRet; if(MyBitmap.IsGrayScale()==GRAY_NO) nRet = MyBitmap.GrayScale(8); return nRet; }