typedef struct _SAVEFILEOPTION
L_UINT64 IFD64; /* 32-bit apps only */
} SAVEFILEOPTION, * pSAVEFILEOPTION;
The SAVEFILEOPTION structure specifies extra options for writing an image file.
The following functions make use of this structure:
See LBaseFile::GetDefaultSaveFileOption for information on default save options.
|uStructSize||Size of the SAVEFILEOPTION structure. This should be sizeof(SAVEFILEOPTION).You must fill this member.|
|Reserved1||Reserved for future use. Pass 0.|
|Reserved2||Reserved for future use. Pass 0.|
|Flags||Any of the following flags. (You can use a bitwise OR to specify more than one value.) Also see the Flags2 member for additional flags.|
|ESO_REVERSEBITS||[0x00000001] Reverses the bit order when writing CCITT Group 3 and 4 files, and RAW uncompressed data so that the least significant bit (LSB) is first.|
|ESO_NOSUBFILETYPE||[0x00000002] Prevents writing a subfile type TIFF tag when writing any TIFF file.|
|ESO_GLOBALBACKGROUND||[0x00000004] Causes a GIF file to be saved with the global background color specified by the GlobalBackground field.|
|ESO_GLOBALPALETTE||[0x00000008] Causes a GIF file to be saved with the global palette specified by the GlobalPalette field.|
|ESO_INTERLACED||[0x00000010] Causes a GIF file to be saved as an interlaced file.|
|ESO_GLOBALLOOP||[0x00000020] Enables looping when loading an animated file. This flag must be on for the GlobalLoop field to be used.|
|ESO_NOPALETTE||[0x00000040] Causes a TIFF file to be saved as grayscale, without a palette.|
|ESO_SAVEWITHSTAMP||[0x00000080] Causes a CMP, JPEG, or Exif file to be saved with a stamp (thumbnail image), in addition to the normal image.|
|ESO_FIXEDPALETTESTAMP||[0x00000100] Causes a CMP or JPEG stamp image to be saved with a fixed palette.|
|ESO_YCCSTAMP||[0x00000200] Causes an Exif stamp image to be saved with YCbCr color space.|
|ESO_REPLACEPAGE||[0x00000400] Replace the page specified by PageNumber.|
|ESO_INSERTPAGE||[0x00000800] Insert the new page before the page specified by PageNumber.|
|ESO_JPEGSTAMP||[0x00001000] Save JPEG compressed stamps.|
|ESO_DISABLEMMX||[0x00002000] Do not use MMX optimized code.|
|ESO_SAVEOLDJTIF||[0x00004000] Write old style JTIF files.|
|ESO_NOPAGENUMBER||[0x00008000] Do not update and save the PageNumber tag associated with the pages of a ulti-page TIFF file.|
|ESO_DISABLEP3||[0x00010000] Do not use P3-specific optimized code.|
|ES0_USEIFD||[0x00020000] Use the IFD offset.|
|ESO_MOTOROLAORDER||[0x00040000] Save files in Motorola byte order when possible.|
|ESO_WITHOUTTIMESTAMP||[0x00080000] Save file without time stamp.|
|ESO_PDF_TEXT_ENCODING_NONE||[0x00000000] No text encoding is used for image data.|
|ESO_PDF_TEXT_ENCODING_ASCII_BASE85||[0x00100000] PDF, ASCII BASE 85 text encoding is used for image data.|
|ESO_PDF_TEXT_ENCODING_ASCII_HEX||[0x00200000] PDF, ASCII HEX text encoding is used for image data.|
|ESO_PDF_ENCODING_MASK||[0x00300000] Mask of the flags is used for PDF text encoding.|
|ESO_PAD4||[0x00400000] Each line is padded to a multiple of 4 bytes. (raw data only).|
|ESO_PDF_ENCODING_MASK||[0x00300000] Mask of the flags is used for PDF text encoding.|
|ESO_PDF_SAVE_USE_BITMAP_DPI||[0x01000000] Use the bitmap DPI in calculating page dimensions when saving a PDF file.|
|ESO_PAD4||[0x00400000] Each line is padded to a multiple of 4 bytes. (raw data only)|
|ESO_PLT_BEZIER_CURVES||[0x00800000] PLT filter should save bezier curves.|
|ESO_PDF_SAVE_USE_BITMAP_DPI||[0x01000000] Use bitmap DPI in calculating page dimensions when saving a PDF file.|
|ESO_PHOTOMETRICINTERPRETATIONVALID||[0x02000000] Use PhotometricInterpretation when saving TIFF files.|
|ESO_TILEINFOVALID||[0x04000000] Use the TileWidth and TileHeight members when saving TIFF files.|
|ESO_USEDITHERINGMETHOD||[0x08000000] Use the DitheringMethod in the BITMAPHANDLE.|
|ESO_PRESERVEPALETTE||[0x10000000] Preserve the palette when saving TIFF CCITT files (might decrease the compression ratio).|
|ESO_PDF_SAVE_LOW_MEMORY_USAGE||[0x20000000] Try to use less memory when creating a PDF file with JPEG or Fax compression.|
|ESO_GENERATEGLOBALPALETTE||[0x40000000] Generate global palette when saving GIF files.|
|ESO_USEPREDICTOR||[0x80000000] Use a predictor when saving LZW data. This is for TIF LZW or Raw LZW data that is 8 bpp or more. This flag is ignored if the LZW data is less than 8 bpp.|
|Passes||The number of passes (scans through the image) when saving a JPEG or LEAD CMP file. (This value is not used when saving interlaced PNG files.)|
|Possible values when saving progressive files:|
|Any positive number||Save the file as a progressive file with the specified number of passes.|
|0||Save the file as an ordinary JPEG or LEAD CMP file (not a progressive file).|
|Any negative number||Save the file as a progressive file with the LEADTOOLS default number of passes.|
|Possible values when saving non-progressive files:|
|0||Save the file with fixed Huffman tables (faster save, lower compression).|
|<>0||Save the file with optimized Huffman tables (2-pass compression, higher compression).|
|PageNumber||The page number of a multipage file, which can contain more than one image. When saving a file, any value greater than 1 will cause the page to be appended to the end of the file. For more information on multipage files refer to Multipage File Formats.|
|GlobalWidth||Width of images in a multipage GIF file.|
|GlobalHeight||Height of images in a multipage GIF file.|
|GlobalLoop||Loop count when playing an animation. Use 0 for continuous looping. For no looping, turn off the ESO_GLOBALLOOP flag in the Flags field.|
|GlobalBackground||Background color of images in a multipage GIF file. This field is used only if the ESO_GLOBALBACKGROUND flag is set in the Flags field. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.|
|GlobalPalette||Palette for images in a multipage GIF file. This field is used only if the ESO_GLOBALPALETTE flag is set in the Flags field.|
|StampWidth||Width, in pixels, of the stamp image to save. A stamp is saved only if the ESO_SAVEWITHSTAMP flag is set in the Flags field.|
|StampHeight||Height, in pixels, of the stamp image to save. A stamp is saved only if the ESO_SAVEWITHSTAMP flag is set in the Flags field.|
|StampBits||Bits per pixel of the stamp image to save. A stamp is saved only if the ESO_SAVEWITHSTAMP flag is set in the Flags field.|
|IFD||Offset within a TIFF file where a page starts. This serves as a reference page for saving pages to a large TIFF file.|
|szPassword||Password for saving encrypted files.|
|PhotometricInterpretation||(TIFF only) Photometric interpretation that should be saved in the file instead of the regular value. Used only if ESO_PHOTOMETRICINTERPRETATIONVALID is set.|
|TileWidth||Width of the tile to use when saving TIFF files. This value is in pixels. Used only if ESO_TILEINFOVALID is set. This value might be modified slightly if necessary. See the notes below for mode details.|
|TileHeight||Height of the tile to use when saving TIFF files. This value is in pixels. Used only if ESO_TILEINFOVALID is set. This value might be modified slightly if necessary. See the notes below for mode details.|
|Flags2||Any of the following flags. (You can use a bitwise OR to specify more than one value.) Also see the Flags member for additional flags.|
|ESO2_NITF||[0x00000001] Saves files compatible with NITF requirements. This flag is used internally.|
|ESO2_SAVEPLANAR||[0x00000002] Save the TIF CMYK images as planar (instead of chunky)|
|ESO2_NOLZWAUTOCLEAR||[0x00000004] Do not automatically insert CLEAR codes during LZW compression.|
|ESO2_ALPHAINIT||[0x00000010] Initialize the alpha channel for 32 or 64-bit color images) to all ones (0xFF for 8-bit alpha channels and 0xFFFF for 16-bit alpha channels). Without this flag, a created alpha channel initializes to zeros.|
|ESO2_XPS_SAVE_USE_BITMAP_DPI||[0x00000080] Use the bitmap DPI in calculating page dimensions when saving a XPS file.|
|ESO2_PDFA_PROFILE||[0x00000100] When saving as PDF, save PDF files as PDF/A format.|
|ESO2_PDF_V13||[0x00004000] When saving as PDF, save PDF files as PDF v1.3.|
|ESO2_PDF_V14||[0x00000200] When saving as PDF, save PDF files as PDF v1.4.|
|ESO2_PDF_V15||[0x00000400] When saving as PDF, save PDF files as PDF v1.5.|
|ESO2_PDF_V16||[0x00002000] When saving as PDF, save PDF files as PDF 1.6|
|ESO2_PDF_V17||[0x00008000] When saving as PDF, save PDF files as PDF 1.7|
|ESO2_ENDWITH3EOL||[0x00000800] End Fax G3 (1D/2D) files with 3 EOLs (00 01 00 01 00 01) instead of EOL EOFB (00 01 00 10 01).|
|ESO2_OPTIMIZEDHUFFMAN||[0x00001000] Save JPEG files with optimized Huffman tables.|
|ESO2_NOGRAYCONVERT||[0x00010000] When saving as JPX, save 12/16 bit grayscale data and can handle LowBit, HighBit, etc.|
|ESO2_BIGTIFF||[0x00020000] Save TIFF files using the BigTiff format, which allows TIFF files to exceed 4GB.|
|ESO1_USEIFD64||[0x00040000] (BigTIFF, 32-bit apps only) Use the 64-bit IFD offset (IFD64).|
This value is useful for accessing pages with offsets > 4GB from very large BigTIFF files. It is not necessary to use IFD64 with regular TIFF files: just use the IFD member instead.
In 64-bit applications, the IFD member is itself a 64-bit value. Therefore, the IFD can be used to access both TIFF and BigTIFF pages and the IFD64 member is not defined.
For 32-bit applications, this member was added in order to access pages in BigTIFF files that exceed 4GB. Of course, TIFF pages can also be accessed using this value.
This value is used only if Flags2 has the ESO2_USEIFD64 flag set.
According to specifications, the minimum value for the first IFD is 8 for TIFF files and 16 for BigTIFF files.
For technical reasons, the following restrictions apply when you pass an IFD offset by setting the IFD member of the SAVEFILEOPTION structure if you set PageNumber to 1:
To load a stamp image, you must use the LFile::ReadStamp function.
Saving a stamp image is valid for the following formats: LEAD, JFIF, LEAD2JFIF, LEAD1JFIF, FILE_EXIF, FILE_EXIF_YCC, and FILE_EXIF_JPEG. For short descriptions, refer to File Formats: JPEG and LEAD Compressed (JPG, J2K, JP2, JPM, CMP, and CMW).
(width * height) + 778.
(width * height * 3) + 10.
If ESO_JPEGSTAMP is set, then the stamps being saved in an Exif JPEG file will be JPEG compressed. The stamps saved in uncompressed Exif TIFF files cannot be JPEG compressed. They can only be RGB or YCbCr.
Page Number Tags
By default, the ESO_NOPAGENUMBER is not set. Therefore, all TIFF files will be saved with an updated PageNumber tag. This is required for Class-F compatibility
When LEADTOOLS saves TIFF files and writes the PageNumber tag, it has to do extra processing when appending, inserting or deleting pages as follows:
These updates take usually very little time. However, when inserting a page into a TIFF file that contains thousands of images, these updates might be time consuming. In that case, you can gain some speed by disabling this functionality.
If ESO_NOPAGENUMBER is set, then LFile::DeletePage will not update the PageNumber tag of any page.
If the ESO_NOPAGENUMBER is not set, then LEADTOOLS will write the PageNumber tag so do not call LFileSettings::SetTag to set this tag (tag 297).
When saving RAW uncompressed data, the bits in each byte can be reversed by passing the ESO_REVERSEBITS flag. In addition, each line of data can be padded so that the length is a multiple of four bytes by passing the ESO_PAD4 flag. The raw data can be saved at any offset in the file by using the LFile::SaveOffset function.
Tiled TIFF Images
Note: For more information about loading and saving large TIFF files faster, refer to Loading and Saving Large TIFF/BigTIFF Files.
When saving TIFF files, the size of the tiles or strips saved in the file can be controlled.
Some graphic packages cannot load TIFF files unless the files are saved with a certain tile or strip size. LEADTOOLS can load files of any strip and tile size, so modifying these settings is not necessary when saving files that will be loaded with LEADTOOLS.
If ESO_TILEINFOVALID is not set, then the TileWidth and TileHeight members of the SAVEFILEOPTION structure are ignored. In this case, the bitmap will be saved like in the previous versions of LEADTOOLS.
If TileWidth is less than or equal to the bitmap width, the bitmap will be saved as tiles. If TileWidth is greater than the bitmap width, the bitmap will be saved as strips.
If the bitmap is saved as tiles, TileHeight controls the height of the tile.
If the bitmap is saved as strips, TileHeight controls the height of the strip. The image can be saved as one strip by setting TileHeight to a value greater than or equal to the bitmap height.
Some compressions (like JPEG or CMP) have limits on the size of the tiles used when saving a file. For example, the JPEG compression requires the tile width and height are multiple of 8 or 16 depending on the subsampling chosen. For these files, if you specified a certain tile size (by setting ESO_TILEINFOVALID and TileWidth and TileHeight), the requested tile size might be updated to the nearest acceptable tile size.
Note: When using the Flags and Flags2 members take care not to mix the placement of the flags. All the EXO_XXX flags should be set in the Flags member, while the ESO2_XXX flags should be set in the Flags2 member.
ESO2_NOLZWAUTOCLEAR can be used when saving TIFF LZW files to save files compatible with some buggy LZW decoders that cannot handle early CLEAR codes. Some IBM decoders are known to have this problem. They will not decode LEAD TIFF LZW files unless this flag is set. This flag is not set by default, which allows LEADTOOLS to insert CLEAR LZW codes and reset the LZW compression engine if the compression ratio is not adequate.
If the ESO2_BIGTIFF flag is set, the file or page being saved will use the BigTIFF format with 64-bit file offsets instead of the 32-bit file offsets that regular TIFF files use. The format passed to the save function determines which compression and color space to use. For example, if the FILE_TIF_J2K format, the file or page being saved will use J2K compression but in the BigTIFF file format instead of the TIFF file format. The BigTIFF file format is less common, but can be used to save files > 4GB.
TIFF and BigTIFF pages cannot be mixed in the same file. For example, you can only append TIFF pages to a TIFF file and BigTIFF pages to a BigTIFF file format. Trying to append/insert TIFF pages into BigTIFF files or vice versa will generate the ERROR_FORMAT_MISMATCH error.