summaryrefslogtreecommitdiffstats
path: root/Doc/lib/libjpeg.tex
diff options
context:
space:
mode:
Diffstat (limited to 'Doc/lib/libjpeg.tex')
-rw-r--r--Doc/lib/libjpeg.tex80
1 files changed, 0 insertions, 80 deletions
diff --git a/Doc/lib/libjpeg.tex b/Doc/lib/libjpeg.tex
deleted file mode 100644
index a10e06c..0000000
--- a/Doc/lib/libjpeg.tex
+++ /dev/null
@@ -1,80 +0,0 @@
-\section{\module{jpeg} ---
- Read and write JPEG files}
-
-\declaremodule{builtin}{jpeg}
- \platform{IRIX}
-\modulesynopsis{Read and write image files in compressed JPEG format.}
-
-
-The module \module{jpeg} provides access to the jpeg compressor and
-decompressor written by the Independent JPEG Group
-\index{Independent JPEG Group}(IJG). JPEG is a standard for
-compressing pictures; it is defined in ISO 10918. For details on JPEG
-or the Independent JPEG Group software refer to the JPEG standard or
-the documentation provided with the software.
-
-A portable interface to JPEG image files is available with the Python
-Imaging Library (PIL) by Fredrik Lundh. Information on PIL is
-available at \url{http://www.pythonware.com/products/pil/}.
-\index{Python Imaging Library}
-\index{PIL (the Python Imaging Library)}
-\index{Lundh, Fredrik}
-
-The \module{jpeg} module defines an exception and some functions.
-
-\begin{excdesc}{error}
-Exception raised by \function{compress()} and \function{decompress()}
-in case of errors.
-\end{excdesc}
-
-\begin{funcdesc}{compress}{data, w, h, b}
-Treat data as a pixmap of width \var{w} and height \var{h}, with
-\var{b} bytes per pixel. The data is in SGI GL order, so the first
-pixel is in the lower-left corner. This means that \function{gl.lrectread()}
-return data can immediately be passed to \function{compress()}.
-Currently only 1 byte and 4 byte pixels are allowed, the former being
-treated as greyscale and the latter as RGB color.
-\function{compress()} returns a string that contains the compressed
-picture, in JFIF\index{JFIF} format.
-\end{funcdesc}
-
-\begin{funcdesc}{decompress}{data}
-Data is a string containing a picture in JFIF\index{JFIF} format. It
-returns a tuple \code{(\var{data}, \var{width}, \var{height},
-\var{bytesperpixel})}. Again, the data is suitable to pass to
-\function{gl.lrectwrite()}.
-\end{funcdesc}
-
-\begin{funcdesc}{setoption}{name, value}
-Set various options. Subsequent \function{compress()} and
-\function{decompress()} calls will use these options. The following
-options are available:
-
-\begin{tableii}{l|p{3in}}{code}{Option}{Effect}
- \lineii{'forcegray'}{%
- Force output to be grayscale, even if input is RGB.}
- \lineii{'quality'}{%
- Set the quality of the compressed image to a value between
- \code{0} and \code{100} (default is \code{75}). This only affects
- compression.}
- \lineii{'optimize'}{%
- Perform Huffman table optimization. Takes longer, but results in
- smaller compressed image. This only affects compression.}
- \lineii{'smooth'}{%
- Perform inter-block smoothing on uncompressed image. Only useful
- for low-quality images. This only affects decompression.}
-\end{tableii}
-\end{funcdesc}
-
-
-\begin{seealso}
- \seetitle{JPEG Still Image Data Compression Standard}{The
- canonical reference for the JPEG image format, by
- Pennebaker and Mitchell.}
-
- \seetitle[http://www.w3.org/Graphics/JPEG/itu-t81.pdf]{Information
- Technology - Digital Compression and Coding of
- Continuous-tone Still Images - Requirements and
- Guidelines}{The ISO standard for JPEG is also published as
- ITU T.81. This is available online in PDF form.}
-\end{seealso}