Digital BW, The Print

Paul Roark wrote:
> I'm scanning some old slides to be made into B&W prints.  I have the
> impression if I scan them in "grayscale" mode I'm probably only getting the
> green sensors and green information out of the slide.  Is that correct?  If
> so, I suspect I'm far better off scanning in full 16 bit color and
> converting later.  (Although medium format RGB 16 bit files start to get
> slow to work with on my PC.)
> 
>  
> 
> Paul
> 
> www.PaulRoark.com <http://www.paulroark.com/>  

In Vuescan the green part of the data collection is increased
in a greyscale scan. I don't know what other software does. I
doubt it would be wise to completely eliminate the red and
blue part in view of the signal/noise ratio if no multi-sampling
  is done.
Converting the color scan later on is better in this case.

I tried to make some profiles that allowed a conversion from 
AdobeRGB to the QTR RGB Lab space along the spectral 
sensitivity curve of specific films (Tri-X etc) but that asks 
for more knowledge. Would be nice though to do that in one 
step. There was solarisation in some cases, in other cases the 
greywedge translated incorrectly.

                    --
           Ernst Dinkla


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