CS 258 Introduction to
Graphics
Spring
Images:
The Tiff Image Specification
CS 258 Introduction to Graphics Fall
Big-Endian and Little-Endian
• Big-Endian: most significant byte to least
significant byte both for 16-bit and 32-bit
integers. This is the “normal” way we write
numbers out.
• Little-Endian: least significant byte to most
significant, again for both 16- and 32-bit
integers.
CS 258 Introduction to Graphics Fall
Some Sample Code
void
SwapShortBytes(unsigned short int * twobytes)
{
unsigned char * tmp = (unsigned char *)twobytes;
unsigned int i;
i = tmp[1];
tmp[1] = tmp[0];
tmp[0] = i;
return;
}
CS 258 Introduction to Graphics Fall
pooh.tif
Color Image. 239 x 184 pixels.
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
Big-Endian
or
Little-Endian
4d4d = Big
4949 = Little
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
Magic
Number
= 42
(0x2a)
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
Address of
the Image
File Directory
(IFD). Must
begin on a
WORD
boundary
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
Address of
the Image
File Directory
(IFD). Must
begin on a
WORD
boundary
CS 258 Introduction to Graphics Fall
[501] seville & od -A x -t x1 pooh.tif | more
0000000 4d 4d 00 2a 00 00 00 08 00 11 00 fe 00 04 00 00
0000010 00 01 00 00 00 00 01 00 00 03 00 00 00 01 00 ef
0000020 00 00 01 01 00 03 00 00 00 01 00 b8 00 00 01 02
0000030 00 03 00 00 00 03 00 00 00 da 01 03 00 03 00 00
0000040 00 01 00 01 00 00 01 06 00 03 00 00 00 01 00 02
0000050 00 00 01 0e 00 02 00 00 00 10 00 00 00 e0 01 11
0000060 00 04 00 00 00 01 00 00 03 2e 01 15 00 03 00 00
0000070 00 01 00 03 00 00 01 16 00 03 00 00 00 01 00 b8
0000080 00 00 01 17 00 04 00 00 00 01 00 02 03 58 01 1a
0000090 00 05 00 00 00 01 00 00 00 f0 01 1b 00 05 00 00
00000a0 00 01 00 00 00 f8 01 1c 00 03 00 00 00 01 00 01
00000b0 00 00 01 28 00 03 00 00 00 01 00 02 00 00 86 49
00000c0 00 01 00 00 01 ea 00 00 01 00 83 bb 00 04 00 00
00000d0 00 11 00 00 02 ea 00 00 00 00 00 08 00 08 00 08
IFD – all data
pertaining to
the
characteristics
of the image.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
First two bytes:
the count, that
is, the number
of entries in the
IFD. Entries
are sorted by
TAG, in
ascending
numerical
order.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Next, the IFD
Entries. Each is
12 Bytes long.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Next, the IFD
Entries. Each is
12 Bytes long.
Bytes 0-1: The
TAG that
Identifies the
field.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Next, the IFD
Entries. Each is
12 Bytes long.
Bytes 0-1: The
TAG that
Identifies the
field.
Bytes 2-3: The
Type of the
field.
Types:
1 = Byte
(8 bit)
2 = Ascii
(8 bit)
3 = Short
(2 byte)
4 = Long
(4 byte)
5 = Rational
(2 Longs)
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Next, the IFD
Entries. Each is
12 Bytes long.
Bytes 0-1: The
TAG that
Identifies the
field.
Bytes 2-3: The
Type of the
field.
Bytes 4-7: The
Count (no. of
values)
Types:
1 = Byte
(8 bit)
2 = Ascii
(8 bit)
3 = Short
(2 byte)
4 = Long
(4 byte)
5 = Rational
(2 Longs)
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Bytes 8-11:
the Value
Offset. The
offset in bytes
of the value
for the field.
Must begin on
a word
boundary.
Can point
anywhere in
the file.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
Bytes 8-11:
the Value
Offset. The
offset in bytes
of the value
for the field.
Must begin on
a word
boundary.
Can point
anywhere in
the file.
If the Value
fits into 4
bytes (i.e. is
1 byte and
has count les
than 5, is a
short and has
count less
than 2, or is
one long,
etc.) THEN
the Value
will be
stored in
bytes 8-11,
and will be
left justified.
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
ImageWidth
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
0000090 00 f0 01 1b 00 05 00 00 00 01 00 00 00 f8 01 1c
00000a0 00 03 00 00 00 01 00 01 00 00 01 28 00 03 00 00
00000b0 00 01 00 02 00 00 86 49 00 01 00 00 01 ea 00 00
00000c0 01 00 83 bb 00 04 00 00 00 11 00 00 02 ea 00 00
00000d0 00 00 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64
ImageLength
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
[503] seville & od -A x -t x1 -j 0xda pooh.tif | more
0000000 00 08 00 08 00 08 50 6f 6f 68 20 61 6e 64 20 54
0000010 69 67 67 65 72 00 00 0a fc 80 00 00 27 10 00 0a
BitsPerSample
CS 258 Introduction to Graphics Fall
Tiff Image Data
Organized into strips. Three fields govern
this: RowsPerStrip, StripOffsets, and
StripBytecounts.
Strips per Image =
÷÷
ø
ö
çç
è
æ +
ipRowsPerStr
1- ipRowsPerStrh ImageLengtfloor
CS 258 Introduction to Graphics Fall
Tiff Image Data
Each strip contains a number of rows of image data.
Putting them all together gives you the image data
for the image.
RowPerStrip = How many rows for each strip
StripOffsets = The location of each of the strips
StripByteCounts = The number of bytes in each strip
CS 258 Introduction to Graphics Fall
[502] seville & od -A x -t x1 -j 0x8 pooh.tif | more
0000000 00 11 00 fe 00 04 00 00 00 01 00 00 00 00 01 00
0000010 00 03 00 00 00 01 00 ef 00 00 01 01 00 03 00 00
0000020 00 01 00 b8 00 00 01 02 00 03 00 00 00 03 00 00
0000030 00 da 01 03 00 03 00 00 00 01 00 01 00 00 01 06
0000040 00 03 00 00 00 01 00 02 00 00 01 0e 00 02 00 00
0000050 00 10 00 00 00 e0 01 11 00 04 00 00 00 01 00 00
0000060 03 2e 01 15 00 03 00 00 00 01 00 03 00 00 01 16
0000070 00 03 00 00 00 01 00 b8 00 00 01 17 00 04 00 00
0000080 00 01 00 02 03 58 01 1a 00 05 00 00 00 01 00 00
[504] seville & od -A x -t x1 -j 0x32e pooh.tif | more
0000000 bb aa ee bb aa ee bb aa ee bb aa ee bb aa ee bb
0000010 aa ee bb aa ee bb aa ee bb aa ee bb aa ee bb aa
0000020 ee bb aa ee bb aa ee bb aa ee bb aa ee bb aa ee
0000030 bb aa ee bb aa ee bb aa ee bb aa ee bb aa ee bb
CS 258 Introduction to Graphics Fall
[507] seville & od -A x -t x1 play2.tif | more
0000000 49 49 2a 00 08 00 04 00 61 3f a8 a3 8a 10 4b 0c
0000010 46 37 0a 16 16 0a 08 0a 08 08 16 9f 9f 9f 9f 9f
0000020 9f 14 58 9e 9e 9e 99 9f 9f 9f 86 9f 9f 9f 9f 9f
[509] seville & od -A x -t x1 -j 0x40008 play2.tif
0040008 10 00 fe 00 04 00 01 00 00 00 00 00 00 00 00 01
0040018 03 00 01 00 00 00 00 02 00 00 01 01 03 00 01 00
0040028 00 00 00 02 00 00 02 01 03 00 01 00 00 00 08 00
0040038 00 00 03 01 03 00 01 00 00 00 01 00 00 00 06 01
0040048 03 00 01 00 00 00 01 00 00 00 0d 01 02 00 2b 00
0040058 00 00 ce 00 04 00 11 01 04 00 20 00 00 00 fa 00
0040068 04 00 12 01 03 00 01 00 00 00 01 00 00 00 15 01
0040078 03 00 01 00 00 00 01 00 00 00 16 01 03 00 01 00
0040088 00 00 10 00 00 00 17 01 04 00 20 00 00 00 7a 01
Little Endian
#include
#include
using namespace std;
int main () {
char buffer[3];
short magicno; // 2 byte quantity
int ifdaddress; // 4 byte quantity
short ifdcount; // 2 byte quantity
ifstream imfile;
imfile.open (“eeyore2.tif", ios::binary );
imfile.seekg (0, ios::beg); //not strictly necessary, but a good idea
Binary File Input
CS 3258 Introduction to Graphics Spring
imfile.read (buffer,2);
imfile.read ((char *)&magicno,2);
imfile.read ((char *)&ifdaddress,4);
imfile.seekg(ifdaddress,ios::beg);
imfile.read((char *)&ifdcount,2);
imfile.close();
buffer[2]='\0';
//Necessary because buffer is a C-style string
cout << "Endian: " << buffer << "\n";
cout << "Magic: " << magicno << "\n";
cout << "IFD Address: " << ifdaddress << "\n";
cout << "IFD Count: " << ifdcount << "\n";
return 0;
}
CS 258 Introduction to Graphics Spring
istream& read (char* s, streamsize n);
Read block of data
Extracts n characters from the stream and stores
them in the array pointed to by s.
imfile.read ((char *)&magicno,2);
#define BIG_ENDIAN 0
#define LITTLE_ENDIAN 1
int IsLittleEndian()
{
short int one = 1;
char *byte = (char *) &one;
return(byte[0] ? LITTLE_ENDIAN : BIG_ENDIAN);
}
What’s the endian-ness of the
machine?
CS 3258 Introduction to Graphics Spring
ofstream outFile(filename.c_str(), ios::binary);
if (outFile.fail())
return 3;
outFile.write("MM", 2);
short magic(42);
outFile.write((char*)&magic, 2);
Binary File Output
CS 3258 Introduction to Graphics Spring

欢迎咨询51作业君