[filmscanners] Re: rebuild your scanner and get better results

["Arthur Entlich" <artistic-1@shaw.ca>]

The Minolta Pro doesn't use LEDs, but cold cathode lighting.  The new
software Minolta recently released or it allow for exposure adjustments
for the R G and B components of the scan which allow for the color
variations and exposure factors from the diffusion materials to be
corrected for.  So there may be a slight increase in scanning time due
to the additional expose time required for the CCDs.

Art


Major A wrote:

>>>They forget to mention that scanning times also increase, and they
>>>probably get more noise as well.
>>>
>>Scanning times WON'T increase. All they are changing is the effective
>>light source.
>>
>
> I assume that the LEDs have constant intensity (it would be
> technically very difficult to make it variable, and wouldn't be of any
> advantage anyway). Therefore you have to increase exposure time to
> compensate for the loss of intensity by the diffusor -- unless you do
> that, you reduce the signal-to-noise ratio. Longer exposure times also
> mean longer scan times (unless your data connection to the computer is
> the bottleneck).
>
>
>>It should also be noted that the web pages about this are meant to be
>>private and the author has asked them not to be publicised as yet.
>>
>
> Oh!
>
> The tonality argument is rather convincing, so I might do tests with
> the LS-30 when I have some time. Note that the film holder is probably
> the worst place for the diffusor, the further away from the film it
> is, the better. I know already where to place it in the LS-30.
>
>   Andras
>


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