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TITLE:Chapter 8: Bitmaps

#contents

* Bitmaps [#Bitmaps]

- The SWF file format specification supports a variety of bitmap formats.
- All bitmaps are compressed to reduce file size.
-  Lossy compression, best for imprecise images such as photographs, is provided by JPEG bitmaps; lossless compression, best for precise images such
as diagrams, icons, or screen captures, is provided by ZLIB bitmaps.
- Both types of bitmaps can optionally contain alpha channel (opacity) information.
- The JPEG format, officially defined as ITU T.81 or ISO/IEC 10918-1, is an open standard developed by the Independent Joint Photographic Experts Group.
- The JPEG format is not described in this document.
- For general information on the JPEG format, see JPEG at www.jpeg.org/.
- For a specification of the JPEG format, see the International Telecommunication Union at www.itu.int/ and search for recommendation T.81.
- The JPEG data in SWF files is encoded using the JPEG Interchange Format specified in Annex B.
- Flash Player also understands the popular JFIF format, an extension of the JPEG Interchange Format.
- In all cases where arrays of non-JPEG pixel data are stored in bitmap tags, the pixels appear in row-major order, reading like English text, proceeding left to right within rows and top to bottom overall.

** DefineBits [#DefineBits]

** JPEGTables [#JPEGTables]

** DefineBitsJPEG2 [#DefineBitsJPEG2]

** DefineBitsJPEG3 [#DefineBitsJPEG3]

** DefineBitsLossless [#DefineBitsLossless]] [#c362c783]

** DefineBitsLossless2 [#DefineBitsLossless2]] [#le6bae11]

** DefineBitsJPEG4 [#DefineBitsJPEG4]