References ▼
A file can be saved using the LEAD Proprietary MRC Format, the Standard MRC format, or PDF format with MRC segmentation. To save the bitmap in the LEAD Proprietary MRC, MRC TIF, or in PDF format, call the LSegment::MrcSaveBitmap function, or call LSegment::MrcSaveBitmapList to save a multi-page file. To save the bitmap in Standard MRC or in the TIF format, call the LSegment::MrcSaveBitmapT44 function.
The LEAD proprietary MRC formats used by the LSegment::MrcSaveBitmap or LSegment::MrcSaveBitmapList function differ from the Standard MRC format used by the LSegment::MrcSaveBitmapT44 function in the following ways:
when using the LEAD Proprietary MRC formats, segments can be 1-bit black and white, 1-bit color, 2-bit color, 2-bit grayscale, 8-bit grayscale, or picture. When using the standard MRC format, segments can be 1-bit black and white, 1-bit color, or picture.
while any application that supports the T44 standard can open a file saved in those formats, only an application with LEADMrc support can open a file saved in one of the LEAD proprietary MRC formats.
saving a given bitmap in one of the LEAD proprietary MRC formats creates a smaller file than saving the same bitmap in the Standard MRC format.
saving a given bitmap in one of the LEAD proprietary MRC formats creates a higher quality file than saving the same bitmap in the Standard MRC format.
when saving a multipaged file as a Standard MRC format (MRC), only one page can be saved. The LEAD Proprietary MRC formats (LEAD-MRC and LEAD-MRC2) are single page file formats.
Note: |
The characteristics of individual images differ greatly and not every image compresses well as mixed raster content. |
The LEADTOOLS implementation of the MRC model involves dividing an object into segments. A segment is a rectangular area on the bitmap that can be classified as text, grayscale, or picture, depending on the number of colors used in its area. Segmentation can be performed automatically, manually, or internally. Different types of compression are available, depending upon which save method is being used as well as which segment type is being compressed.
All save functions use the COMPRESSIONOPTIONS structure to specify the compression and quality factor information for the file. The following members of this structure are used to specify compression and quality characteristics to be used when saving an MRC file:
nMaskCoder
nPictureCoder
nPictureQFactor
In addition, when saving a bitmap in one of the LEAD Proprietary MRC formats, the following members of the COMPRESSIONOPTIONS structure can be used to specify compression and quality for the additional segment types available to that format:
nGrayscale2BitCoder
nGrayscale8BitCoder
nGrayscale8BitQFactor
nText2BitCoder
LSegment::MrcSaveBitmap and LSegment::MrcSaveBitmapList use the COMPRESSIONOPTIONS structure to specify the compression and quality factor information for the PDF file. The following members of this structure are used to specify compression and quality characteristics to be used when saving an PDF file:
nMaskCoder
nPictureCoder
nPictureQFactor
nText2BitCoder
With LEADTOOLS it is easy to handle the segmentation process, whether performing segmentation automatically using the LSegment::MrcSegmentBitmap function or manually using the LSegment::MrcCreateNewSegment function.