How to make an SEG talk
Prepare the slides
I could convert it all to postscript and shoot it from a ghostview
display. But I guess I feel that the xtpen display of vplot is superior
to the ghostview display of the the figures postscript version.
- To create text and math slides
I write the text and formulas in TeX files such as example
I then bring the pages up with ghostview and shoot them
- To compute the figures:
Here are two sample makefiles (
) that have rules to make great slide figures.
- To display Vplot figures:
Vplot figures I bring up on the screen
with a rule specified in the makefiles above,
and shoot the slides (see below).
- To display Postscript figures:
Postscript figures (e.g. made by xfig) I
create with a rule in the makefiles above,
include them in a
bring it up with ghostview, and
shoot the slides (see below).
Shoot slides from screen
Here is another person and his experience:
- Get a 200 Asa film (Kodak Chrom for example).
- Get a SLR camera with stative and cable trigger.
- Set back ground either blue or black.
Copy this Xdefaults
file into your Setup directory.
- Darken the room entirely: glue the hallway window if necessary.
- Choose long exposure and small aperture (no screen streaks).
- Take each slide twice and vary the aperture slightly.
Last week I ended up wasting about 5 hours trying to get the slide maker
to work. In the end I not only wsated my time, but also a role of film.
After a suggestion from Mani, I tried taking pictures of the screen, and I
must say that the results were impressive. I believe that the potential
for quality is probably higher as the screen resolution is better than the
If you need to make slides let me propose the following proceedure:
- 1) Arrange your slides in a presentation, or put all pictures in a
single directory, making empty space black.
- 2) Turn off lights, and set up a manual camera on a tri-pod a few
feet from the screen (leaving space to move it as necessary)
- 3) If you have a cable release then I recommend attaching it,
otherwise just try to be still as you take the pictures. I also ended up
needing to use my macrolens on a 50mm lens in order to get the screen in
focus at the desired distance. A longer lens may eliminate the need for
- 4) Move the tri-pod and camera in order to get the framing you
- 5) Focus screen. I found that it helps to focus on the edge, as
there will tend to be a straight line on the border which aids in
- 6) Using the spot meter, adjust the aperture and shutter speed to be
correct for the brightest spot on the screen. Next, OPEN UP TWO FULL
STOPS (give it 4 times the exposure, putting the brights in zone 7) If
you are shooting on negative film instead of slide, then you must do the
opposite: meter the darkest spot and then close down two full stops.
- 6) It is recommended to use the longest exposure time possible to
overcome the flickering of the screen.
- 7) For next frame, repeat steps 4-6
- 8) Take to developer (Photo-time at the Stanford Shopping Center does
2 hour E-6 processing: $9.20 for 36) and voila.