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Conclusion This chapter on progressive mode brings to a close our coverage of JPEG In this and preceding chapters, we have discussed all of the JPEG features that are in common use The material presented covers all of the JPEG modes that you are likely to encounter in JPEG files on the Internet The source code for this chapter is not a complete example, but rather the additional code required to expand the sample applications from s 8 and 9 to include progressive encoding and decoding
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This chapter describes the CompuServe GIF format and the LZW compression method used to compress image data in this format Until recently, CompuServe GIF (Graphics Interchange Format) was the most widely used format for image storage In 1987 CompuServe published the first GIF specification called GIF87a This specification was freely distributed, and the format was adopted by practically every image processing application CompuServe later released an enhanced, upwardly compatible version of the standard known as GIF89a However, most GIF images use only the features in GIF87a The main features of GIF are: Up to 256 colors using 1 to 8 bits per pixel Multiple images per file Because of its better compression and greater color depth, JPEG has generally replaced GIF for photographic images GIF continues to be used for other applications, but legal entanglements have certainly condemned it to obsolescence
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Byte Ordering The GIF format stores multi-byte integers with the least significant byte first (little-endian) Bit strings are read from the least significant bit to the most significant bit In bit strings that cross byte boundaries, the bits in the second byte are more significant than the bits in the first byte
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File Structure A GIF file consists of a fixed area at the start of the file, followed by a variable number of blocks and ending with an image trailer In the GIF87a format the variable area consists solely of image definitions In the GIF89a format these can be either images or extension blocks The general format of a GIF file is shown in Figure 121 GIF Header The GIF header is required and must occur at the very start of the file The header allows an application to identify the format as GIF and determine the version Table 121 shows the structure of the GIF header It is still common for applications that do not use the features added in GIF89a to create GIF87a headers in order to insure the image is compatible with older decoders Logical Screen Descriptor The global screen description defines the logical screen area in which the individual images in the GIF file are displayed It specifies the dimensions of the area as well as the background color (selected from the global color table) The individual image descriptors specify where the image is to be placed within the logical screen The screen descriptor structure is 7 bytes and is shown in Table 122 Figure 122 illustrates the relationship between the logical screen and the individual images in a GIF file Global Color Table The individual images within the file can either use the global color table or define a color table of their own Having the images in a file share the global
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Figure 121 GIF File Structure
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Table 121 GIF Header Structure
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Field Name Signature Version
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Description Must be the ASCII string GIF Must be the ASCII string 87a or 89b
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Table 122 Logical Screen Descriptor Format
Field Name Logical Screen Width Logical Screen Height Bit Fields Global Color Table Size Color Table Sort Flag Bits Per Pixel Global Color Table Flag Background Color Pixel Aspect Ratio
Size 2 bytes 2 bytes 1 byte Bits 0-2
Bit 3
Description
Bits 4-6 Bit 7 1 byte 1 byte
2(N+1) gives the number of entries in the global color table Set when the colors in the global color table are sorted in order of importance Bits per pixel minus 1 Set when there is a global color table Index into the global color table If this value is nonzero, the pixel width and height are not equal (N+15)/64 is the pixel width divided by the pixel height