AKAIK, a true HDR image is a 64 bit floating point number. 48 bits is
nothing special... just 16 bits per color channel. I can't believe it
should be dark. There's not enough digital data at the dark end of the
histogram.
Chuck Norcutt
On 6/14/2012 10:21 AM, Tina Manley wrote:
> Yes, I'm using a Nikon LS5000 with an SF-210 batch loader. I'm using the
> Silverfast 48bit HDR scan with two exposures. According to the Silverfast
> site, it is normal for the raw scan to be very dark but it does contain all
> of the information available in the slide. I think where I am messing up
> is in the conversion and post-processing. I have no problem at all with
> any other film. Just the Kodachromes behave this way. But I have tons of
> Kodachromes to scan!
>
> Color negatives scan fine: http://www.pbase.com/tinamanley/image/143476719
>
> And Astia, too: http://www.pbase.com/tinamanley/image/143565322
>
> Tina
>
> On Thu, Jun 14, 2012 at 10:12 AM, Ken Norton<ken@xxxxxxxxxxx> wrote:
>
>> Tina,
>>
>> I'm not suggesting dropping Silverfast at all. From what I've seen of
>> it, it's easier and faster to work with than Vuescan. I've been
>> tempted to actually get it myself, but the tightwad in me says "stay
>> content with what you have".
>>
>> Am I correct that you are using a Nikon scanner?
>>
>> Silverfast, like Vuescan is able to do the two-pass "HDR" like scan.
>> This is important as it helps pull the details out of the shadows. If
>> the "raw file" is dark and the highlights are more than a stop away
>> from clipping, then you really do have a scan exposure problem going
>> on.
>>
>> It really is true--scanning requires an "ETTR" (Expose To The Right)
>> methodology to maximize quality. I wonder how much of the "grain" you
>> are seeing in the scans is actually scanner noise and lack of bit
>> depth coming off the scanner.
>>
>>
>> --
>> Ken Norton
>> ken@xxxxxxxxxxx
>> http://www.zone-10.com
>> --
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>>
>
>
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