| author | eckhart.koppen@nokia.com |
| Wed, 31 Mar 2010 11:06:36 +0300 | |
| changeset 7 | f7bc934e204c |
| permissions | -rw-r--r-- |
|
7
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
1 |
<HTML> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
2 |
<HEAD> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
3 |
<TITLE> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
4 |
Introduction to the TIFF Documentation |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
5 |
</TITLE> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
6 |
</HEAD> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
7 |
<BODY BGCOLOR=white> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
8 |
<FONT FACE="Arial, Helvetica, Sans"> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
9 |
<H1> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
10 |
<IMG SRC=images/strike.gif WIDTH=128 HEIGHT=100 ALIGN=left HSPACE=6> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
11 |
Introduction to the TIFF Documentation |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
12 |
</H1> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
13 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
14 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
15 |
<P> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
16 |
The following definitions are used throughout this documentation. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
17 |
They are consistent with the terminology used in the TIFF 6.0 specification. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
18 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
19 |
<DL> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
20 |
<DT><I>Sample</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
21 |
<DD>The unit of information stored in an image; often called a |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
22 |
channel elsewhere. Sample values are numbers, usually unsigned |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
23 |
integers, but possibly in some other format if the SampleFormat |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
24 |
tag is specified in a TIFF |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
25 |
<DT><I>Pixel</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
26 |
<DD>A collection of one or more samples that go together. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
27 |
<DT><I>Row</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
28 |
<DD>An Nx1 rectangular collection of pixels. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
29 |
<DT><I>Tile</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
30 |
<DD>An NxM rectangular organization of data (or pixels). |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
31 |
<DT><I>Strip</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
32 |
<DD>A tile whose width is the full image width. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
33 |
<DT><I>Compression</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
34 |
<DD>A scheme by which pixel or sample data are stored in |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
35 |
an encoded form, specifically with the intent of reducing the |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
36 |
storage cost. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
37 |
<DT><I>Codec</I> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
38 |
<DD>Software that implements the decoding and encoding algorithms |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
39 |
of a compression scheme. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
40 |
</UL> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
41 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
42 |
<P> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
43 |
In order to better understand how TIFF works (and consequently this |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
44 |
software) it is important to recognize the distinction between the |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
45 |
physical organization of image data as it is stored in a TIFF and how |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
46 |
the data is interpreted and manipulated as pixels in an image. TIFF |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
47 |
supports a wide variety of storage and data compression schemes that |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
48 |
can be used to optimize retrieval time and/or minimize storage space. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
49 |
These on-disk formats are independent of the image characteristics; it |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
50 |
is the responsibility of the TIFF reader to process the on-disk storage |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
51 |
into an in-memory format suitable for an application. Furthermore, it |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
52 |
is the responsibility of the application to properly interpret the |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
53 |
visual characteristics of the image data. TIFF defines a framework for |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
54 |
specifying the on-disk storage format and image characteristics with |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
55 |
few restrictions. This permits significant complexity that can be |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
56 |
daunting. Good applications that handle TIFF work by handling as wide |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
57 |
a range of storage formats as possible, while constraining the |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
58 |
acceptable image characteristics to those that make sense for the |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
59 |
application. |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
60 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
61 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
62 |
<P> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
63 |
<HR> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
64 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
65 |
Last updated: $Date: 1999/08/09 20:21:21 $ |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
66 |
|
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
67 |
</BODY> |
|
f7bc934e204c
5cabc75a39ca2f064f70b40f72ed93c74c4dc19b
eckhart.koppen@nokia.com
parents:
diff
changeset
|
68 |
</HTML> |