Converts an unsigned bitmap to signed.
#include "l_bitmap.h"
L_LTIMGCOR_API L_INT L_ConvertBitmapUnsignedToSigned(pBitmap, uFlags)
Pointer to the bitmap handle referencing the bitmap.
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. |
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
This function updates pBitmap
->MaxVal and pBitmap-> MinVal with new values that reflect the bitmap's new signed data. In addition, the pBitmap->Flags.Signed 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 in the Document and Medical Imaging 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.
Win32, x64, Linux.
L_INT ConvertBitmapUnsignedToSignedExample(L_VOID)
{
L_INT nRet;
/* Bitmap handle to hold the loaded image. */
BITMAPHANDLE LeadBitmap;
LOADFILEOPTION LoadFileOption;
/* enable negative pixels to be loaded from TIFF files */
nRet = L_GetDefaultLoadFileOption(&LoadFileOption, sizeof(LOADFILEOPTION));
if(nRet != SUCCESS)
return nRet;
LoadFileOption.Flags |= ELO_SIGNED;
/* Load the bitmap, as 16-bit grayscale un-signed */
nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("clean.tif")), &LeadBitmap,sizeof(BITMAPHANDLE), 16, ORDER_GRAY, &LoadFileOption, NULL);
if(nRet != SUCCESS)
return nRet;
/* convert bitmap to signed */
if(!LeadBitmap.Flags.Signed)
{
nRet = L_ConvertBitmapUnsignedToSigned(&LeadBitmap, PROCESS_RANGE_ONLY);
if(nRet != SUCCESS)
return nRet;
}
L_FreeBitmap(&LeadBitmap);
return SUCCESS;
}
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