With the left mouse button you can creates and edit a selection rectangle. The middle mouse button is used to start drag'n'drop operations. The right mouse button brings up the control window with menus, toolbar and file list.

Many keyboard shortcuts used by xv are available in ida too. If you are familiar with xv if should be easy for you to get started with ida.

All available keyboard shortcuts are also listed in the menus of the control window. The most important ones are listed below:

space           next file
backspace       previous file
cursor keys     scrolling (hold ctrl key for big steps).
plus / minus    zoom in/out
Q               quit

read: PPM, xwd, PhotoCD, xpm, xbm, bmp (uncompressed), JPEG, TIFF, PNG, GIF. The last four are supported using the usual libraries, i.e. you need to have them installed at compile time.

write: PPM, PostScript, JPEG, TIFF, PNG.

ida is a motif application and thus supports the motif drag'n'drop protocol in both directions. The xdnd protocol is supported too, but only in one direction (receive drops).

ida uses the middle mouse button to start a drag'n'drop operation (as the motif style guide suggests). This works for the main window and the file buttons within the file browser.

motif applications should have absolutely no problems to deal with ida's drag'n'drop support. You can drop images into some netscape 4.x window -- it simply works. Mozilla accepts motif drops too.

Interoperation with gnome / gtk is good. I can drag files from ida to eeyes and visa versa without problems. File drops from gmc into ida work just fine too.

Interoperation with KDE is bad. cut+paste works most of the time, drag'n'drop often doesn't. The X11 selection handling of the Qt toolkit has a few design bugs and sucks. Basically the troll guys didn't understand what the TARGETS target is good for and violate the ICCCM specs by ignoring it.