photos from screen

Judy Callaway callaway at JAC.PDB.BNL.GOV
Wed May 5 17:13:17 EST 1993

On May 5,  8:30pm, aj greenwood wrote:
> Subject: Sharp Ribbons Photographs
> Can anyone post to this group or e-mail to me such tricks and
> tips that I may use to get crisp, clear, sharp photographs and
> slides of protein ribbon models from a computer graphics screen.
> We are using Ribbons 2.0 by Mike Carson on an SGI 4D/320 VGX.
> Our camera is a Cannon T-60.

I work on an SGI 4D/35 with a standard 19" SGI monitor.  Here's the dope from
the machine itself:

1 36 MHZ IP12 Processor
FPU: MIPS R2010A/R3010 VLSI Floating Point Chip Revision: 4.0
CPU: MIPS R2000A/R3000 Processor Chip Revision: 3.0
On-board serial ports: 4
Data cache size: 64 Kbytes
Instruction cache size: 64 Kbytes
Main memory size: 24 Mbytes
Integral Ethernet: ec0, version 0
Disk drive: unit 1 on SCSI controller 0
Integral SCSI controller 0: Version WD33C93A, revision 9
Graphics board: GR1.2 Bit-plane, Z-buffer, Turbo options installed

I take pictures directly off the screen as follows:
1. clean the screen (of course, sorry, but it vital)
2. degauss
3. I use either a Hassleblad 500C with 80 mm lens and number 16 extension tube
to get close enough OR a Pentax something or other, but the key is a nice Zeiss
lens and again extension tubes to get close enough so that the screen completely
fills the frame you want to take
4. I use Kodak Ektachrome 100 ASA and shoot at f8 and 1 second. Usually I
bracket an f-stop each way to compensate for dark or light atom colors I have
5. Our graphics program is Midas Plus
6. I have the room completely dark except for my computer screen

If you have seen the Protein Data Bank booth at the ACA convention or the
Biophysical Society convention is D.C., the pictures in our booth are mine.

I've blown the Hassy photos up to 20 X 20 and 20 X 24 and they hold up, I have
not blown up the Pentax ones primarily because I've had no reason to.

This is one of my most favorite parts of my job here, so if I can be of further
assistance let me know.  My next project is to import our images into Adobe
Photoshop and do some interesting manipulations with them there.

					Good Luck,

					Judy Callaway

  Judith A. Callaway		* internet:  callaway at
  Protein Data Bank             * bitnet:    callaway at bnlchm			
  Bldg. 555 Chemistry Dept.     * telephone: (516) 282-5748
  Brookhaven Nat'l Laboratory	* fax:       (516) 282-5751
  Upton, New York   11973 	* 

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