FLOG(OPCSDEFS)         Optical Printer Control System      FLOG(OPCSDEFS)

    NAME
	flog - configure fader's logarithmic movement

    SYNOPSIS
	flog [value]    # value is a signed floating point number
	                # (-2.0 is recommended for NORMAL fades)

    DESCRIPTION
	Sets characteristics of log function used to calculate fades. This 
	command lets you harden the log curve, or 'soften' it to almost linear.

	Values for FLOG are normally negative, since it is usually desirable
	to have a sharper curve on the OPEN end of a fade.

	In the NEGATIVE range, FLOGs that approach -1.0 force the curve to
	become more linear, whereas values that approach -10000 (lowest value 
	recommended) harden the fading curve on the OPEN end (normal).

	In the POSITIVE range, FLOGS that approach 1.0 force the curve to
	become more linear, whereas values that approach 10000 (highest value 
	recommended) harden the fading curve on the CLOSED end (giving a comical
	'zip' to/from black).

	Values between -1.0 and 0.0 (and values between 1.0 and 0.0) cause
	a linear fade, which is more or less a DISSOLVE.

    TABLE OF FLOG VALUES AND THEIR EFFECT ON A 12 FRAME FADE

                   <----  FLOG  VALUES  ---->
FRM |  -50   |  -20   |   -5   |   -2   |    2   |   5    |   20   |  50
----|--------|--------|--------|--------|--------|--------|--------|-------
1   |   3.70 |   4.68 |   7.29 |  10.44 |  19.63 |  30.39 |  53.86 |  70.66
2   |   7.75 |   9.78 |  15.12 |  21.34 |  37.81 |  53.96 |  80.99 |  96.28
3   |  12.21 |  15.39 |  23.57 |  32.75 |  54.73 |  73.22 |  99.26 | 112.29
4   |  17.19 |  21.61 |  32.76 |  44.72 |  70.56 |  89.50 | 113.07 | 123.96
5   |  22.81 |  28.60 |  42.83 |  57.30 |  85.43 | 103.60 | 124.16 | 133.16
6   |  29.26 |  36.57 |  53.96 |  70.56 |  99.44 | 116.04 | 133.43 | 140.74
7   |  36.84 |  45.84 |  66.40 |  84.57 | 112.70 | 127.17 | 141.40 | 147.19
8   |  46.04 |  56.93 |  80.50 |  99.44 | 125.28 | 137.24 | 148.39 | 152.81
9   |  57.71 |  70.74 |  96.78 | 115.27 | 137.25 | 146.43 | 154.61 | 157.79
10  |  73.72 |  89.01 | 116.04 | 132.19 | 148.66 | 154.88 | 160.22 | 162.25
11  |  99.34 | 116.14 | 139.61 | 150.37 | 159.56 | 162.71 | 165.32 | 166.30
12  | 170.00 | 170.00 | 170.00 | 170.00 | 170.00 | 170.00 | 170.00 | 170.00


    BUGS
        FLOG values above 10000 or below -10000 blow out the software with a 
	range error when you try to shoot a fade. Keep values out of this range.

    SEE ALSO
	-- Operator Commands --
        CAM	  - shoot camera (fades/dissolves too)
        OPN	  - open the fader shutter to 170 degrees
	SHU 	  - send fader shutter to an absolute position
	CLS	  - close the fader shutter to 0 degrees
        DXI/DXO   - set up dissolve in/out
        FDI/FDO   - set up fade in/out

	-- Opcs Setup Commands --
	FLOG      - set Fader LOGarithmic curve for custom fades
	FRANGE    - set fade/dx's degrees range (for Hicon film stocks)
	INTERP    - set interpolation positions (fader, focus, etc)
	SLOP      - correct for slop in a motor (fader, focus, etc)

    ORIGIN
	Gregory Ercolano, Los Feliz California 12/14/89
© Copyright 1997 Greg Ercolano. All rights reserved.