diff -r 000000000000 -r 1918ee327afb src/3rdparty/libtiff/html/intro.html --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/3rdparty/libtiff/html/intro.html Mon Jan 11 14:00:40 2010 +0000 @@ -0,0 +1,68 @@ + + + +Introduction to the TIFF Documentation + + + + +

+ +Introduction to the TIFF Documentation +

+ + +

+The following definitions are used throughout this documentation. +They are consistent with the terminology used in the TIFF 6.0 specification. + +

+
Sample +
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 +
Pixel +
A collection of one or more samples that go together. +
Row +
An Nx1 rectangular collection of pixels. +
Tile +
An NxM rectangular organization of data (or pixels). +
Strip +
A tile whose width is the full image width. +
Compression +
A scheme by which pixel or sample data are stored in + an encoded form, specifically with the intent of reducing the + storage cost. +
Codec +
Software that implements the decoding and encoding algorithms + of a compression scheme. + + +

+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. + + +

+

+ +Last updated: $Date: 1999/08/09 20:21:21 $ + + +