[daip] displaying big images

[Lynn D. Matthews]

When one does an interactive clean with IMAGR, it has the very convenient
feature of figuring out automatically how to size the image to fit the
display, and then redetermining the optimal txinc,tyinc if one zooms in to
examine a smaller region.

I wanted to suggest that an interactive TV display of this kind would be
extremely valuable to have outside of IMAGR as well.

In my case, I am lately doing a great deal of work with large
(8192x8192x512) spectral line image cubes, and frequently need to examine
both the large-scale emission distribution and small-scale structure of
features in a given channel (or a series of channels).  Currently I define
many different windows, resetting txinc,tyinc each time to get sufficient
resolution at different scales, but this becomes tedious and limits how
thoroughly I can explore each cube, uncover artifacts, compact isolated
features, etc. TVROAM is sometimes a help, but is not compatible with
other functions I often use, such as the ability to overplot/modify clean
boxes with DRAWBOX.

Lynn Matthews