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

\author{Carl Heiles}

Images are important. We have IDL procedures that help you do images and
we have prepared tutorials on images that explain things, including
our procedures. The first below talks about the different kinds of
color images---one, two, or three independent
quantities. The second details how to do this in
IDL. And the third tells how to use images for exploration and
modification of data sets, and how to obtain numbers from them that you
can use for science. Here they are:
\begin{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
  tutorial ({\tt 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.
  \end{enumerate}

\item To make the three different kinds of image in {\bf 1d2d3d\dots}, you
  can follow the IDL codes in its appendicies. For a more
  explanation of these procedures, including how to position colorbars, 
considerable detail on several fronts, and a
  discussion of options, see {\it trdisplay.pdf}, which
  is entitled {\bf TRDIDL: Image Display, Annotation, and Examination
    with Tim Robishaw's {\tt display.pro} and Related Procedures}.

\item Don't forget our plotting handout. For annotating images,
  you need to know plotting; this is {\tt bpidl.pdf}, which we alrready
  distributed; it's titled {\bf BPIDL---Basic Plotting in IDL\dots}. In
  particular, it covers plotting up to five variables simultaneously using 
  plotting symbols, color, size, and shape.

\enlargethispage{6em}
\item The above are oriented towards making nice plots for illustrative
  and presentation purposes. You also need to understand image
  processing---how to extract information from and manipulate images on
  your computer screen. Enter our introductory tutorial {\tt
    ididl_2015.pdf}: {\bf IDEAMAN---Image Display, Exploration, And
    MANipulation}. 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 Displaying the image with IDL's {\tt tv}.
\item Image manipulation, processing, contrast enhancement.
\end{enumerate}
  
\end{enumerate}
\end{document}

