ilabel displays the given Silicon Graphics image_file and
lets the user put labels over the image. The Silicon
Graphics image file may be generated by scrsave(1),
imgsnap(1), or some other program, such as conic(1L), that
uses the Silicon Graphics Image Library. The labels are
drawn using the Silicon Graphics GL Font Manager, which
supports many fonts in arbitrary sizes. Labels may be saved
to a file for reuse via the -o flag. The stored attributes
of labels include color, vertical and horizontal
justification, font, size, and position relative to the
image. The saved label files may be displayed again using
the -i flag. There may be several -i files but at most one
-o file. The output file is created when the user selects
Exit from the pop-up menu. If the file already exists, the
user is asked whether the file should be overwritten (unless
the -f flag was specified, in which case no question is
asked). You can also save labels before exiting by choosing
SaveLabels off the pop-up menu. If you do this, you will
be prompted for a file name whether or not you specified -o
on the command line. You can save a new image with the
labels embedded in it by choosing SaveImage from the pop-up
menu. You will be prompted for a file name. Note that if
you intend to use the itops(1) utility to print the image,
it is better to save the labels in a separate file rather
than embedded in the image, since the quality of the labels
will then be limited by the resolution of the printer rather
than the resolution of the image. Labeled images can be
converted to printable PostScript files with the itops(1)
utility provided with the MidasPlus distribution. It is
necessary to use the -L flag of itops in order to have the
labels placed on the image.
To add a new label, simply click the left mouse button,
which should make a triangular cursor appear, and type in
the label. Labels containing multiple lines may be created
by typing either RETURN or LINEFEED at the appropriate
place. The left button is also used to select other labels
so that they may be edited. The middle button is used to
select and move labels. The right button displays a menu
which contains options to show and hide the defaults panel
(see below), redraw the images and labels, save the current
labels in a file, save the current image, turn the mouse
cursor on and off, and quit.
The default display attributes for labels are as follows:
font
Times Roman
size
14
color
white justification bottom left
All these values may be changed via the defaults panel,
which is shown when the user selects the ShowDefaults
option from the right-button menu. When the mouse cursor is
over the defaults panel, the left mouse button is used to
select the justification mode and label color; the font size
may be changed by typing the size and then RETURN (no cursor
is shown); and new fonts may be selected from the right-
button menu. Also, colors may be selected from anywhere on
the screen. If the mouse button is depressed over the color
selection area, the mouse may be moved anywhere and a color
will not be selected until the button is released.