POW and X Colormaps
POW allows some interactive manipulation of the Colortable used
to display grayscale images. POW has detailed X Colormap
handling options with this release. There are four different
ways of dealing with colormaps. The powColormap options are
available in fv by using the "-cmap" command line argument to
fv. The different options are:
- 0 - let POW attempt to determine the optimum colormap
setup for you. This is the default.
- 1 - Force POW to setup a private colormap. POW will setup
this colormap to minimize (but not eliminate) flashing.
- 2 - Force POW to use truecolor. If you have a 16 or
24 bit truecolor visual available, this looks very nice,
and allows different colortables for different images,
but interactive changes to the image colortable are slow.
If you only have 8 bit truecolor, this will look pretty
bad.
- 3 - Force POW to use the screen default colormap. This
guarantees no flashing, but may force truecolor
image mode to be used with an 8-bit visual
which looks really awful.
Generally, if you experience colormap problems, mode 1 is
probably the most robust unless you don't have any pseudocolor
visuals (e.g. a Linux machine running in 16 or 24 bit mode).
The POW Color Menu
The POW Color menu has three parts:
- The top section has a few default colortables to choose
from.
- You can reverse the "dark to light" direction of your
colortable by checking the Invert Colortable button.
- There are three scalings of the colortable available in the
lower section.
You can interactively change the contrast and brightness of the
current image's colortable by dragging the left mouse button across
the image.
The FTOOLS help hotline
Last modified: Tue Oct 27 12:20:00 EDT