mirror of
https://github.com/python/cpython
synced 2024-11-02 12:55:22 +00:00
54 lines
2.2 KiB
TeX
54 lines
2.2 KiB
TeX
\section{\module{rgbimg} ---
|
|
Read and write ``SGI RGB'' files}
|
|
|
|
\declaremodule{builtin}{rgbimg}
|
|
\modulesynopsis{Read and write image files in ``SGI RGB'' format (the module
|
|
is \emph{not} SGI specific though!).}
|
|
|
|
\deprecated{2.5}{This module is not maintained anymore and seems to be
|
|
unused.}
|
|
|
|
The \module{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
|
|
enough in some cases. Currently, colormap files are not supported.
|
|
|
|
\note{This module is only built by default for 32-bit platforms; it is
|
|
not expected to work properly on other systems.}
|
|
|
|
The module defines the following variables and functions:
|
|
|
|
\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 \function{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 \function{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}
|