LFile::SaveFile

#include "ltwrappr.h"

virtual L_INT LFile::SaveFile(nFormat, nBitsPerPixel=0, nQFactor=2, uFlags=0, pSaveFileOption=NULL)

L_INT nFormat;

output file format

L_INT nBitsPerPixel;

resulting file's pixel depth

L_INT nQFactor;

quality factor

L_UINT uFlags;

flags that indicate the behavior of the function

pSAVEFILEOPTION pSaveFileOption;

pointer to optional extended save options

Creates a file in any of the supported compressed or uncompressed formats.

Parameter Description
nFormat Output file format. For valid values, refer to .Files To Be Included With Your Application.
nBitsPerPixel Resulting file's pixel depth. Note that not all bits per pixel are available to all file formats. For valid values, refer to Files To Be Included With Your Application. If nBitsPerPixel is 0, the file will be stored using the closest BitsPerPixel value supported by that format. For example, if a file format supports 1, 4, and 24 BitsPerPixel, and LBitmapBase::GetBitsPerPixel returns 5, the file will be stored as 24 bit. Likewise, if LBitmapBase::GetBitsPerPixel returns 2, the file will be stored as 4 bit.
nQFactor This parameter is used when saving an image to file format that supports quality factor (QFactor). QFactor is a number that determines the degree of loss in the compression process.
  For possible values, refer to Compression Quality Factors.
uFlags Binary flags that determine the behavior of LFile::SaveFile. Possible values are:
  Value Meaning
  SAVEFILE_FIXEDPALETTE [0x0001] The function uses the fixed palette for images that are saved as 8 bits per pixel or less.
  SAVEFILE_OPTIMIZEDPALETTE [0x0002] The function uses the individual image's optimized palette for images that are saved as 8 bits per pixel or less. The optimized palette must be included in the bitmap handle.
  SAVEFILE_MULTIPAGE [0x0004] The function saves the image in a multipage file. It appends the image as the last one in the file. You can save multipage images in PCX, GIF, and most TIFF file formats (including JTIF, but excluding EXIF).
  SAVEFILE_GRAYOUTPUT [0x0008] The function saves the image as grayscale.
pSaveFileOption Pointer to optional extended save options. Pass NULL to use the default save options.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

You can override the LFile::SaveFileCallBack virtual function to supply the image data.

If you do not override the callback function, this function saves data from the class object's associated bitmap.

If you use a callback and save the bitmap as a MacPaint (MAC) file, the image to be saved must have a width of 576 and a height of 720 (the required dimensions of that format).

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

Note: More options are available in the SAVEFILEOPTION structure.

Note: If SAVE_MULTIPAGE is passed in uFlags, this takes precedence over the EFO_REPLACEPAGE or EFO_INSERTPAGE flags set in SAVEFILEOPTION.

This function does not support signed data images, unless they are DICOM images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image that is not a DICOM image is passed to this function.

This function supports signed data images, but only DICOM and TIFF formats support signed data. This function will return an error code if you attempt to save a signed image to a format other than DICOM or TIFF.

If the bitmap has a region, the region stored in the bitmap will be saved, if the image is saved as one of the TIFF file formats.

For information on saving bitmaps that have been window leveled, refer to Saving Window-Leveled Bitmaps.

In LEADTOOLS version 17 and up, when saving a colored image (such as a 24-bits per pixel image) to bitonal (1-bit per pixel), the toolkit will not use any dithering when converting the image data. This is done because dithering is not the recommended when converting colored images containing text for document processing such as OCR and Barcode. The result text will be fuzzy and hard for a recognition engine to process. To save a colored image as bitonal with Floyd-Stein dithering (the behavior of LEADTOOLS 16.5 and earlier) use the ESO_USEDITHERINGMETHOD along with LBitmapBase::SetDitheringMethod as illustrated below:

// 'leadBitmap' is a colored LBitmapBase 
// 'leadFile' is LFile object 
// Setup FloydStein dithering: 
leadBitmap.SetDitheringMethod(FLOYD_STEIN_DITHERING); 
SAVEFILEOPTION saveOptions = {0}; 
leadFile.GetDefaultSaveFileOption(&saveOptions, sizeof(SAVEFILEOPTION)); 
saveOptions.Flags |= ESO_USEDITHERINGMETHOD; 
leadFile.Save(FILE_CCITT_GROUP4, 1, 0, 0, &saveOptions); 
// or any other Save overloads or methods 

Required DLLs and Libraries

LTFIL
File format DLLs

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.

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