Gimp - 2.4 Guía Del Usuario
GNU Image Manipulation Program
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U
URI
A Uniform Resource Identifier (URI) is a string of characters that serves to identify an abstract or a physical resource.
URIs are used for the identification of resources in the Internet (such as web pages, miscellaneous files, calling up web
services, and for receivers of e-mail) and they are especially used in the Worldwide Web.
URIs are used for the identification of resources in the Internet (such as web pages, miscellaneous files, calling up web
services, and for receivers of e-mail) and they are especially used in the Worldwide Web.
URL
URLs (Uniform Resource Locators) are one type of Uniform Resource Identifiers (URIs). URLs identify a resource by its
primary access mechanism (commonly http or ftp) and the location of the resource in the computer network. The name of
the URI scheme is therefore generally derived from the network protocol used for it. Examples of network protocols are
http, ftp and mailto.
primary access mechanism (commonly http or ftp) and the location of the resource in the computer network. The name of
the URI scheme is therefore generally derived from the network protocol used for it. Examples of network protocols are
http, ftp and mailto.
Since URLs are the first and most common kinds of URIs, the terms are often used synonymously.
V
Value
This term often refers to the light intensity, the luminosity of a color. It varies from 0 (black) to 100 (full light).
X
XCF
XCF is a
which is special because it is GIMP’s native file format: that is, it was designed specifically to store
all of the data that goes to make up a GIMP image. Because of this, XCF files may be quite complicated, and there are few
programs other than GIMP that can read them.
programs other than GIMP that can read them.
When an image is stored as an XCF file, the file encodes nearly everything there is to know about the image: the pixel data
for each of the layers, the current selection, additional channels if there are any, paths if there are any, and guides. The
most important thing that is not saved in an XCF file is the undo history.
for each of the layers, the current selection, additional channels if there are any, paths if there are any, and guides. The
most important thing that is not saved in an XCF file is the undo history.
The pixel data in an XCF file is represented in a lossless compressed form: the image byte blocks are compressed using
the lossless RLE algorithm. This means that no matter how many times you load and save an image using this format, not
a single pixel or other image data is lost or modified because of this format. XCF files can become very large, however
GIMP allows you to compress the files themselves, using either the gzip or bzip2 compression methods, both of which are
fast, efficient, and freely available. Compressing an XCF file will often shrink it by a factor of 10 or more.
the lossless RLE algorithm. This means that no matter how many times you load and save an image using this format, not
a single pixel or other image data is lost or modified because of this format. XCF files can become very large, however
GIMP allows you to compress the files themselves, using either the gzip or bzip2 compression methods, both of which are
fast, efficient, and freely available. Compressing an XCF file will often shrink it by a factor of 10 or more.
The GIMP developers have made a great effort to keep the XCF file format compatible across versions. If you create a file
using GIMP 2.0, it ought to be possible to open the file in GIMP 1.2. However, some of the information in the file may
not be usable: for example, GIMP 2.0 has a much more sophisticated way of handling text than GIMP 1.2, so a text layer
from a GIMP 2.0 XCF file will appear as an ordinary image layer if the file is opened in GIMP 1.2.
using GIMP 2.0, it ought to be possible to open the file in GIMP 1.2. However, some of the information in the file may
not be usable: for example, GIMP 2.0 has a much more sophisticated way of handling text than GIMP 1.2, so a text layer
from a GIMP 2.0 XCF file will appear as an ordinary image layer if the file is opened in GIMP 1.2.
Y
YCbCr
YCbCr is a
which was developed for the PAL television standard as a simple modification to the YUV color
model. In the meantime, it has become the CCIR-601 standard for image and video recording. For example, it is used
for JPEG pictures and MPEG videos, and therefore also on DVDs, video CDs and for most other widespread digital video
standards. Note that a color model is still not a color space, since it doesn’t determine which colors are actually meant by
‘red’, ‘green’ and ‘blue’. For a color space, there must still be a reference to a specific absolute color value.
for JPEG pictures and MPEG videos, and therefore also on DVDs, video CDs and for most other widespread digital video
standards. Note that a color model is still not a color space, since it doesn’t determine which colors are actually meant by
‘red’, ‘green’ and ‘blue’. For a color space, there must still be a reference to a specific absolute color value.