background image
ISO/IEC 10918-1 : 1993(E)
The marker and parameters shown in Figure B.10 are defined below. The size and allowed values of each parameter are
given in Table B.8.
COM:
Comment marker ­ Marks the beginning of a comment.
Lc:
Comment segment length ­ Specifies the length of the comment segment shown in Figure B.10
(see B.1.1.4).
Cm
i
:
Comment byte ­ The interpretation is left to the application.
Table B.8 ­ Comment segment parameter sizes and values
Values
Parameter
Size (bits)
Sequential DCT
Progressive DCT
Lossless
Baseline
Extended
Lc
16
2-65 535
Cm
i
1
8
0-255
22
B.2.4.6
Application data syntax
Figure B.11 specifies the marker segment structure for an application data segment.
1
. . .
APP
n
Lp
Ap
Ap
Lp-2
TISO0930-93/d029
Application data segment
Figure B.11 ­ Application data syntax
Figure B.11 [D29], = 2.8 cm = 98.%
The marker and parameters shown in Figure B.11 are defined below. The size and allowed values of each parameter are
given in Table B.9.
APP
n
:
Application data marker ­ Marks the beginning of an application data segment.
Lp:
Application data segment length ­ Specifies the length of the application data segment shown in
Figure B.11 (see B.1.1.4).
Ap
i
:
Application data byte ­ The interpretation is left to the application.
The APP
n
(Application) segments are reserved for application use. Since these segments may be defined differently for
different applications, they should be removed when the data are exchanged between application environments.
Table B.9 ­ Application data segment parameter sizes and values
Values
Parameter
Size (bits)
Sequential DCT
Progressive DCT
Lossless
Baseline
Extended
Lp
16
2-65 535
Ap
i
1
8
0-255
22
44
CCITT Rec. T.81 (1992 E)
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