With the help from Scion, the following program modifies NIH Image 1.50b83 and has several features (with Scion LG-3 board):
 
The first change to look at is the Make Movie command.  The dialog box structure has been changed.  There is only one box for entering the number of frames and the frame delay.  There are two check boxes: one to activate video rate capturing and the other to activate blind movie capturing.
 
A macro command MakeMovie has been added,  which optionally takes three arguments. The first argument is a string which may contain some combination of 'Blind', 'VideoRate', and 'DacControl'.  The first two strings activate the same modes as the check boxes mentioned above. 'DacControl' enables control of the digital to analog converters during movie capturing.  This feature will only work if video rate capturing is enabled. The second argument is the number of frames to capture.  The third argument is the delay between frames.  Note that if video rate capturing is specified, the frame delay will always be taken as zero.
 
You may specify how the dacs are to be manipulated during capture using the new macro command, StoreScion(frame: integer, dacA: integer, dacB: integer,delay:integer). Frame may be from 1 to 128, the dac's may range from 0 to 255. Delay can be from 0 to 255. When this command is used, it will cause the dac's to be set to the given values prior to capture of the specified frame during a MakeMovie command (provide that 'DacControl' is specified. After the Dacs are set prior to the specified frame the software will wait for delay frames before recommencing video rate capturing.
 
All previous dac specifications can be cleared (set to zero) using the macro
command ScionClear.
 
For example, suppose you wish to capture 32 frames at video rates with the
following dac specifications:
 
    Before frame 1      dacA    37      dacB    221
    Skip 2 frams
    Before frame 19     dacA    147     dacB    0        
    Skip 3 frams
    Before frame 23     dacA    12      dacB    178
 
Then you could use the following macro
 
    macro 'Example';  
{for video rate capture}
    begin
        ClearScion;
        StoreScion(1,37,221,0);
        StoreScion(19,147,2);
        StoreScion(23,12,178,3);
        MakeMovie('VideoRate DacControl',32,0.0);
    end;
 
 
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Guang Mei   gmei@hoh.mbl.edu     Tel:(508)548-3705 ext 374
Program of Architectural Dynamics in Living Cells
Marine Biological Laboratory, Woods Hole, MA 02543-1031