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+\section{Built-in module \sectcode{rgbimg}}
+\bimodindex{rgbimg}
+
+The rgbimg module allows python programs to access SGI imglib image
+files (also known as \file{.rgb} files).  The module is far from
+complete, but is provided anyway since the functionality that there is
+is enough in some cases.  Currently, colormap files are not supported.
+
+The module defines the following variables and functions:
+
+\renewcommand{\indexsubitem}{(in module rgbimg)}
+\begin{excdesc}{error}
+This exception is raised on all errors, such as unsupported file type, etc.
+\end{excdesc}
+
+\begin{funcdesc}{sizeofimage}{file}
+This function returns a tuple \code{(\var{x}, \var{y})} where
+\var{x} and \var{y} are the size of the image in pixels.
+Only 4 byte RGBA pixels, 3 byte RGB pixels, and 1 byte greyscale pixels
+are currently supported.
+\end{funcdesc}
+
+\begin{funcdesc}{longimagedata}{file}
+This function reads and decodes the image on the specified file, and
+returns it as a python string. The string has 4 byte RGBA pixels.
+The bottom left pixel is the first in
+the string. This format is suitable to pass to \code{gl.lrectwrite},
+for instance.
+\end{funcdesc}
+
+\begin{funcdesc}{longstoimage}{data\, x\, y\, z\, file}
+This function writes the RGBA data in \var{data} to image
+file \var{file}. \var{x} and \var{y} give the size of the image.
+\var{z} is 1 if the saved image should be 1 byte greyscale, 3 if the
+saved image should be 3 byte RGB data, or 4 if the saved images should
+be 4 byte RGBA data.  The input data always contains 4 bytes per pixel.
+These are the formats returned by \code{gl.lrectread}.
+\end{funcdesc}
+
+\begin{funcdesc}{ttob}{flag}
+This function sets a global flag which defines whether the scan lines
+of the image are read or written from bottom to top (flag is zero,
+compatible with SGI GL) or from top to bottom(flag is one,
+compatible with X).  The default is zero.
+\end{funcdesc}