LBitmap::ConvertUnsignedToSigned

#include "ltwrappr.h"

virtual L_INT LBitmap::ConvertUnsignedToSigned(uFlags)

L_UINT uFlags;

/* flag */

Converts an unsigned bitmap to signed.

Parameter	Description
uFlags	Flag that indicates how to process bits outside the low bit to high bit range. Possible values are:
	Value	Meaning
	PROCESS_RANGE_ONLY	[0x0001] Shift data by adding half the range to each pixel without changing bits outside the (LowBit-HighBit) range.
	PROCESS_OUTSIDE_RANGE	[0x0002] Shift data by adding half the range to each pixel and set to zero all bits outside the (LowBit-HighBit) range.

Returns

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

Comments

This function updates MaxVal and MinVal different values with new values that consider bitmap new sign. Also LBitmapBase::IsPixelsSigned() value will be set to one.

This function supports 12 and 16-bit grayscale images. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.

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

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.

See Also

Functions:	LBitmapBase::ClearNegativePixels, LBitmap::ConvertSignedToUnsigned
Topics:	Processing an Image
	Raster Image Functions: Getting and Setting Pixel Values

Example

L_INT LBitmap__ConvertUnsignedToSignedExample(LBitmap * plBitmap) 
{
   L_INT nRet;
   /* convert bitmap to signed */
   if(!plBitmap->IsPixelsSigned() ) 
   {
      nRet =plBitmap->ConvertUnsignedToSigned(PROCESS_RANGE_ONLY);
      if(nRet !=SUCCESS)
         return nRet;
   }
   else
      return FAILURE;
   return SUCCESS;
}