L_INT LBitmap::InvertedPage(pbIsInverted, uFlags)
Detects if the image (page) is inverted (white text and black background), and invert it if it is not.
Address of the variable to be updated with the detection result. Possible values are:
|TRUE||The image is inverted.|
|FALSE||The image is not inverted.|
Flags that indicate whether to invert the image. Possible values are:
|INVERTEDPAGE_PROCESS||[0x00000000] Invert the image.|
|INVERTEDPAGE_NOPROCESS||[0x00000001] Don't invert the image. Generally this flag is used to find whether the image is inverted.|
|INVERTEDPAGE_EXCLUDE_BORDER||[0x00000002] Excludes White or Black borders from the calculations.|
|INVERTEDPAGE_USE_ZONES||[0x00000004] An advanced version that is able to detect figure images before inverting them. This option is slower than the other options. This flag cannot be used with INVERTEDPAGE_EXCLUDE_BORDER.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
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.
If uFlags contains INVERTEDPAGE_NOPROCESS, the function will update pbIsInverted with the result, without inverting the image.
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
This function does not support 12 and 16-bit grayscale and 48 and 64-bit color images. If the image is 12 and 16-bit grayscale and 48 and 64-bit color, the function will not return an error.
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.
L_INT LBitmap__InvertedPageBitmapExample(LBitmap & LeadBitmap)
L_BOOL IsInverted; /* the boolean that will hold the value of (Is the page inverted or not) */
/* Load the bitmap, keeping the bits per pixel of the file */
nRet = LeadBitmap.Load(TEXT("C:\\LEADTOOLS21\\Resources\\Images\\OCR1.TIF"));
nRet = LeadBitmap.InvertedPage(&IsInverted, INVERTEDPAGE_PROCESS);
nRet = LeadBitmap.Save(TEXT("C:\\LEADTOOLS21\\Resources\\Images\\Result.BMP"), FILE_BMP, 24, 0, NULL);
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