晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Introduction to the TIFF Documentation
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Introduction to the TIFF Documentation
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<P>
The following definitions are used throughout this documentation.
They are consistent with the terminology used in the TIFF 6.0 specification.

<DL>
<DT><I>Sample</I>
<DD>The unit of information stored in an image; often called a
  channel elsewhere.  Sample values are numbers, usually unsigned
  integers, but possibly in some other format if the SampleFormat
  tag is specified in a TIFF
<DT><I>Pixel</I>
<DD>A collection of one or more samples that go together.
<DT><I>Row</I>
<DD>An Nx1 rectangular collection of pixels.
<DT><I>Tile</I>
<DD>An NxM rectangular organization of data (or pixels).
<DT><I>Strip</I>
<DD>A tile whose width is the full image width.
<DT><I>Compression</I>
<DD>A scheme by which pixel or sample data are stored in
  an encoded form, specifically with the intent of reducing the
  storage cost.
<DT><I>Codec</I>
<DD>Software that implements the decoding and encoding algorithms
  of a compression scheme.
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<P>
In order to better understand how TIFF works (and consequently this
software) it is important to recognize the distinction between the
physical organization of image data as it is stored in a TIFF and how
the data is interpreted and manipulated as pixels in an image.  TIFF
supports a wide variety of storage and data compression schemes that
can be used to optimize retrieval time and/or minimize storage space.
These on-disk formats are independent of the image characteristics; it
is the responsibility of the TIFF reader to process the on-disk storage
into an in-memory format suitable for an application.  Furthermore, it
is the responsibility of the application to properly interpret the
visual characteristics of the image data.  TIFF defines a framework for
specifying the on-disk storage format and image characteristics with
few restrictions.  This permits significant complexity that can be
daunting.  Good applications that handle TIFF work by handling as wide
a range of storage formats as possible, while constraining the
acceptable image characteristics to those that make sense for the
application.


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Last updated: $Date: 2016-09-25 20:05:44 $

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