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%\title{{\boldmath FOUR TUTORIALS ON IMAGES: NOVICE $\rightarroww$ EXPERT \\ \today}}
\title{ FOUR TUTORIALS ON IMAGES: NOVICE $\rightarrow$ EXPERT \\ \today}

\author{Carl Heiles}

Images are important. We have IDL procedures that help you do images and
we have prepared four tutorials on images that explain things, including
our procedures. These tutorials take you from the know-nothing novice to
the overconfident expert. Like a four-course French dinner, you
ingest them in order of presentation. They're bite-sized; don't gobble,
finish each course before trying the next.  Here they are:
\begin{enumerate}

\item You need to know plotting to do images, e.g.\ if you want to label
  them with axes and annotations. For this you need {\tt bpidl.ps,
  bpidl.pdf}: {\bf BPIDL---BASIC PLOTTING IN IDL...} It covers\dots
  \begin{enumerate}
\item Basic plotting, overplotting
\item Sampling the plot with the cursor (we like Tim Robishaw's {\tt
  trc.pro}
\item Annotating plots; Greek letters, etc., using {\tt textoidl}
\item Arrays of plots
\item Plottine up to five variables simultaneously using 
  plotting symbols, color, size
\item Selecting groups of points in a plot with the cursor
\item Making good-looking PostScript files
\end{enumerate}

\item You need to understand basic concepts and to learn how to display
  and manipulate images on your computer screen. Enter our introductory
  tutorial {\tt ididl.ps, ididl.pdf}: {\bf Image Display and
  Manipulation in IDL (IDIDL) ... Images with a Single 256-Entry Color
  Table}. It covers\dots \begin{enumerate}
\item The X-window and your computer screen; pixels, bytes.
\item TrueColor, PseudoColor, the color table, combined color,
  decomposed color
\item The {\it Visual Class}: Dynamic {\it vs.}\ static colortables 
\item Displaying the image with IDL's {\tt tv} and with Tim Robishaw's
{\tt display.pro} .
\item Image manipulation, processing, contrast enhancement.
\item Colorbars: one-d (intensity only) and two-d (intensity and color)
\end{enumerate}

\item Ordinary images display a single quantity, often surface
  brightness; we call these {\it one-dimensional} images. However, in a
  single image you can use color to display two or three quantities
  simultaneously. We call these {\it two-dimensional} and {\it
  three-dimensional} images, respectively., so appropriately enough this
  final tutorial ({\tt newdimensionalcolor.ps, newdimensionalcolor.pdf}
  is entitled {\bf 1d2d3d: One, Two, and Three Dimensional Color
  Images}\dots
  \begin{enumerate}
\item One-dimensional images; contrast; colortables; the colorbar
\item Non-gray one-dimensional color images: choosing the colortable.
\item Two-dimensional color images: intensity combined with a
   non-gray colortable; using nonsaturated colors to make perceived
   intensity orthogonal to color.
\item Three-dimensional color images: the orthogonality of red, green,
  and blue.
\item Colorbars for one-, two-, and three-dimensional color images.
\item Appendices, which tell how to make these images in IDL.
\end{enumerate}

====================================================

\item The first course dealt with the bare image. That's like having an
  hors d'oeuvre without wine: usually you want
  to {\it annotate} the image by labelling with axes or putting arrows
  or labels on the image itself. Moreover, you should indicate what a
  particular color or intensity on the image means in terms of physical
  units (such as surface brightness), for which you use a colorbar. So
  the next course is {\bf IACIDL: Image Annotation and Colorbars in IDL}
  It covers\dots \begin{enumerate}
\item How to insert your image in the window and leave appropriate space
  around the border for axes and/or a colorbar.
\item How to make labelled axes and insert comments on images.
\item How to insert a colorbar.
\item How to scale an arbitrary-sized image so that it fits on your
  computer screen.
\item Important basic details for making X-windows and PostScript images.
\end{enumerate}

\item The first two courses concentrate on images for the computer screen.
  That's like cooking for yourself: it's fine for you, but you usually want
  to present your final, beautifully handcrafted image to the world, either
  on paper or in (God Forbid!)  PowerPoint. The first step is making a
  PostScript image, so the next course is entitled {\bf PSIDL: PostScript
    Files in IDL -- Making, Printing, and PowerPointing}. Note this works
  for graphs as well as images!  Your PostScript images can be either
  objects of beauty or\dots not. We much prefer the former and this
  tutorial tells all about it\dots \begin{enumerate}
\item Greek letters and Fonts in X and PS: \verb$psopen$ and
  \verb$textoidl$. 
\item Plotting directly to PostScript.
\item Printing PostScript images; PowerPointing PostScript images.
\item Lots of appendices with details you might wwant to know, including
  how to make quick and dirty PostScript directly from your computer
  screen image.
\end{enumerate}


\end{enumerate}
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