Built-in module imageop

imageop The imageop module contains some useful operations on images. It operates on images consisting of 8 or 32 bit pixels stored in python strings. This is the same format as used by gl.lrectwrite and the imgfile module. The module defines the following variables and functions:
\begin{excdesc}{error} This exception is raised on all errors, such as unknown number of bits per pixel, etc. \end{excdesc}

\begin{funcdesc}{crop}{image\, psize\, width\, height\, x0\, y0\, x1\, y1} This ... ... the new image is mirrored. The same holds for the y coordinates. \end{funcdesc}

\begin{funcdesc}{scale}{image\, psize\, width\, height\, newwidth\, newheight} T... ...rated images or dithered images will not look nice after scaling. \end{funcdesc}

\begin{funcdesc}{tovideo}{image\, psize\, width\, height} This function runs a v... ...isplayed on a video device that uses interlacing, hence the name. \end{funcdesc}

\begin{funcdesc}{grey2mono}{image\, width\, height\, threshold} This function co... ...d and is probably only useful as an argument to \code{mono2grey}. \end{funcdesc}

\begin{funcdesc}{dither2mono}{image\, width\, height} This function also convert... ...nochrome image but it uses a (simple-minded) dithering algorithm. \end{funcdesc}

\begin{funcdesc}{mono2grey}{image\, width\, height\, p0\, p1} This function conv... ...o greyscale pass the values \code{0} and \code{255} respectively. \end{funcdesc}

\begin{funcdesc}{grey2grey4}{image\, width\, height} Convert an 8-bit greyscale image to a 4-bit greyscale image without dithering. \end{funcdesc}

\begin{funcdesc}{grey2grey2}{image\, width\, height} Convert an 8-bit greyscale image to a 2-bit greyscale image without dithering. \end{funcdesc}

\begin{funcdesc}{dither2grey2}{image\, width\, height} Convert an 8-bit greyscal... ...e{dither2mono}, the dithering algorithm is currently very simple. \end{funcdesc}

\begin{funcdesc}{grey42grey}{image\, width\, height} Convert a 4-bit greyscale image to an 8-bit greyscale image. \end{funcdesc}

\begin{funcdesc}{grey22grey}{image\, width\, height} Convert a 2-bit greyscale image to an 8-bit greyscale image. \end{funcdesc}