Re: filmscanners: Canon 4000 scanner VS Nikon LS4000 >Mikael

[Arthur Entlich <artistic@ampsc.com>]

Hi Ed,

I think someone just quoted Nikon's own manual in one of the groups
(maybe this one) and it stated that the LED brightness was altered
(unfortunately, I deleted it  Aha! I found it in my trash bin...  I
quote it below)  Maybe Nikon doesn't know what their own devices do,
that wouldn't surprise me at all.


 > In case it might be of interest, here's the text from my LS-30
 >> Nikonscan manual (pdf file):
 >>
 >> Analog gain is used to adjust the intensity of the scanners light
 >> source, emphasizing selected colors in the input image. The
 >> controls for analog gain consist of four sliders: a master slider
 >> that allows the user to increase the brightness of all LEDs in the
 >> scanner's light source simultaneously, and red, green, and blue
 >> sliders that allow independent adjustment of the red, green, and
 >> blue LEDs.
 >> Moving a slider to the right increases the intensity of the affected
 >> LED; moving it to the left decreases the intensity. Click
 >> the Help button for information on using analog gain.
 >> Note: Setting the intensity of the scanner's light source too high
 >> may produce 'smear' or other defects in the scanned image.
 >

Am I missing something in my reading of this?

Art

EdHamrick@aol.com wrote:

 > In a message dated 11/21/2001 8:07:15 AM EST, artistic@ampsc.com writes:
 >
 >
 >>Nikon might be approaching the limits of linearity in the LEDs.  They
 >> also need to be able to have a range of brightness available to them 
for
 >> the "analog exposure" they offer.
 >>
 >
 > No, Nikon scanners don't vary the brightness of the LEDs.  The
 > "analog gain" option in NikonScan only changes the CCD exposure
 > time.  I've traced the commands that NikonScan sends to the
 > scanner, and the field it changes is definitely the CCD exposure
 > time field.
 >
 > In addition, the scan speed is proportional to the "analog gain"
 > setting, which it wouldn't be if NikonScan were only changing
 > the brightness of the LEDs.
 >
 > Regards,
 > Ed Hamrick
 >
 > .
 >
 >