FRANGE(OPCSDEFS) Optical Printer Control System FRANGE(OPCSDEFS) NAME frange - configure the open/close positions for fades/dissolves USAGE frange [close] [open] # values are in degrees EXAMPLES frange 0 170 # normal for a 170 degree shutter frange 90 130 # for special Hicon film stocks # (fades/dissolves go from 90 to 130 # degrees) DESCRIPTION FRANGE(OPCSDEFS) allows the user to specify the open and closed positions [in degrees] for the FADE/DISSOLVE commands. NOTES ************************************************************************* ** This command does NOT affect the OPN/CLS commands, which still go ** ** full open/full closed. ** ************************************************************************* The fader must be in the correct start position for a fade/dissolve to occur without giving an error. If the FRANGE is set to 90/150, then the fader must be at 90 degrees before doing a FDI/DXI, and 150 degrees before doing a FDO/DXO. ************************************************************************ ** Use the 'shu' command to correctly position the fader before ** ** doing a fade/dissolve with a custom FRANGE in effect. ** ************************************************************************ EXAMPLE USE By wedging the fader positions, you can find at what points light becomes exposed on the film. You can then set the FRANGE parameters to the low and high values that you find from wedging. You can then make two small scripts that turn the special fade/dissolve setup on and off. Make the following two files: ********************* *** 0-170.RUN *** ********************* @# ENABLE NORMAL FADES AND DISSOLVES (0-170) @! echo frange 0 170 > foo.defs ! ldefs foo.defs @! echo FADES/DISSOLVES NOW RUN FROM 0 TO 170 DEGREES ********************** *** 90-150.RUN *** ********************** @# ENABLE SPECIAL FADES/DXS (90=closed, 150=open) @! echo frange 90 150 > foo.defs ! ldefs foo.defs @! echo FADES/DISSOLVES NOW RUN FROM 90 TO 150 DEGREES You then need only to run the appropriate script before shooting: run 90-150.run # setup new fader values shu 90 # (fader starts in new position) fdi 12 rep 12 # shoot 12 frame fadein using 90-150 rep 200 # (fader is at 150 for rest of shoot) dxo 24 rep 12 # dissolve out from 150 to 90 degrees cls cam 120 # (closes fader to 0 for windoff) run 0-170.run # Go back to normal fades/dissolves BUGS none reported. SEE ALSO OPCS Commands CAM(OPCS) - shoot camera (fades/dissolves too) OPN(OPCS), CLS(OPCS) - open/close fader shutter SHU(OPCS) - move fader to an absolute position in degrees DXI(OPCS), DXO(OPCS) - set up dissolve in/out FDI(OPCS), FDO(OPCS) - set up fade in/out OPCSDEFS Commands FLOG(OPCSDEFS) - set Fader LOGarithmic curve for custom fades FRANGE(OPCSDEFS) - set fade/dx's degrees range (for Hicon film stocks) INTERP(OPCSDEFS) - set interpolation positions (fader, focus, etc) SLOP(OPCSDEFS) - correct for slop in a motor (fader, focus, etc) General MATH(DOCS) - math expressions (for use in frame specifications) SYNTAX(DOCS) - online calculator and OPCS math expression syntax ORIGIN Gregory Ercolano, Los Feliz California 04-21-92