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authorFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
committerFred Drake <fdrake@acm.org>1998-05-07 01:49:07 (GMT)
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-\section{Built-in Module \module{jpeg}}
-\label{module-jpeg}
-\bimodindex{jpeg}
-
-The module \module{jpeg} provides access to the jpeg compressor and
-decompressor written by the Independent JPEG Group%
-\index{Independent JPEG Group}%
-. JPEG is a (draft?)
-standard for compressing pictures. For details on JPEG or the
-Independent JPEG Group software refer to the JPEG standard or the
-documentation provided with the software.
-
-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}