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Conclusion { IHDR Data Length: 13 Data CRC: 9cc69707 File CRC: 9cc69707 Image Size: 383 x 262 Bit Depth: 8 Color Type: Palette Index Compression Method: deflate/inflate - 32k Sliding Window Filter Method: adaptive Interlace Method: none } { PLTE Data Length: 768 Data CRC: 9fe76824 File CRC: 9fe76824 Palette Color Count: 100 } { IDAT Data Length: 2000 Data CRC: 710a2c5b File CRC: 710a2c5b } { IDAT Data Length: 2000 Data CRC: d857c86a File CRC: d857c86a } { IDAT Data Length: 2000 Data CRC: 119cab52 File CRC: 119cab52 } { IDAT Data Length: 2000 Data CRC: 1ab5b934 File CRC: 1ab5b934 } { IDAT Data Length: 2000 Data CRC: 610914db File CRC: 610914db } { IDAT Data Length: 5b7 Data CRC: cee96fbe File CRC: cee96fbe } { IEND Data Length: 0 Data CRC: ae426082 File CRC: ae426082 }
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Figure 136 Sample PNGDUMP Output
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Decompressing PNG Image Data
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The previous chapter explained how to decode a PNG file up to the point where the image data within the IDAT blocks is interpreted This chapter covers the remaining topics needed to decode a PNG file The main focus is the Deflate compression process that PNG uses to store pixel data in IDAT chunks
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Decompressing the Image Data The first step in processing the image data is to decompress it During the decompression process we treat the chunk data from the IDAT chunks in the image file as a continuous stream of bytes; then we pass them to a decompressor for the Deflate/Inflate processes The segmentation of the compressed stream into IDAT chunks is irrelevant to the decompression processes The sequence of compressed data bytes would be the same if one IDAT were used to hold the entire compressed block, if each compressed byte were placed in a separate IDAT chunk, or any combination between these two extremes ZLIB, Deflate, and PNG Before Unisys started to demand licenses for its use in software, LZW had not been confined to GIF It had also been used in many types of compression applications including the Unix compress program When LZW could no longer be used in free software, there was an immediate need for a freely usable compres-
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Decompressing PNG Image Data sion method to replace it The solution came in the form of a general-purpose compression library known as ZLIB ZLIB employs an LZ77-based compression process known as Deflate, which had its origins in the ZIP and PKZIP programs The compression source code within ZIP was too tightly bound to the application for general use, so JeanLoupe Gailly and Mark Adler created ZLIB to implement Deflate compression in a manner that can be used by other applications ZLIB has been used not only in PNG but in the GZIP archiving program as well Currently, Deflate is the only compression method supported by ZLIB, but the ZLIB format has provisions for other methods to be added in the future For this discussion we are going to describe ZLIB and Deflate only as they apply to PNG Not all settings that are valid in ZLIB/Deflate are legal when used in PNG files The source code examples in this and the following chapters contain implementations of the PNG subset of Deflate
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LZ77 Compression The LZ77 process uses a sliding window to maintain a dictionary of recently processed text The compressed stream is a sequence of codes that are either literal values or commands for the decompressor to copy text from the window to the output stream An LZ77 decompressor reads each code in the compressed stream in sequence Codes that represent literal values are copied directly to the output stream Command codes are replaced in the output stream with text copied from the LZ window In either case, the LZ window is advanced so that the last character copied to the output stream is included in the window The big advantage of dictionary compression over Huffman coding is that compression can be done on the fly without having to process the entire stream, making it suitable for applications such as compression of data streams in a computer network Figure 141 contains a simplified example of LZ77 decompression using a 16-byte window The data consists of 7-bit ASCII text, so by using 1 bit to differentiate a literal value from a command, each code in the compressed stream can be encoded using 8 bits In this example copy commands are represented as <Offset:Length> where the offset is the number of bytes from the start of the LZ77 window and the length is the number of bytes to copy In this example the first six codes are literal values that are copied to the output stream The seventh code copies two characters from the tenth position in the LZ Window ("A") to the output stream As new codes are read, the window fills up and text starts to become lost to the compression processes Notice that the final "MA" in the text could have been compressed into a code had that string not slid out of the window
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