coolscan 5000 vs Minolta dimage II

  • Thread starter Thread starter gotnoname
  • Start date Start date
Steven said:
The LOG lines certainly are the feature missing from the NEC sensor that
Rafe referenced. Please ignore this question if it has already been
answered but is there any way to discharge the imaging cells apart from
pulsing TG which would have the unfortunate side-effect of loading the
transport cells ?
Click to expand...
Yes it loads the transport cells, but you don't have to use the data
that you know is corrupt. In fact, it won't even reach the output if
you assert the output reset and clamp lines.

Normally, the channel with the shortest exposure would have a similar
exposure as in the normal case, with the other channels requiring longer
exposure. This would certainly be the case in the example that
initiated this discussion - extending the blue, and to a lesser degree
the green, exposure to compensate for the orange mask on a negative
film. So for that type of application there is plenty of time do clock
out the pre-exposure charge conventionally without even resorting to any
of the tricks with clock and clamp phasing that I referred to earlier,
but you can get rid of it faster using those steps if you need to.
 
It would only corrupt the previous line if it hasn't been read out yet.
After that the transport cells are empty and you can pulse the TG lines
independently to transfer any photocharge that has accumulated
pre-exposure into the transport cells and then dump it all from there
once the shortest exposure has been initiated. As I said, it is less
than ideal, but it works.
Click to expand...

I can now see that this would work because the previous line would not
be the last valid line but a junk intermediate line taken while the
stepper motor was advancing the carriage to the next position.

-- Steven
 
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