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[filmscanners] Re: Scanning chromogenic

Just for clarification, because I was not aware of this:

1) In the case of a film scanner, if one sets the scanner driver to
black and white film, and it scans in greyscale, is there a standard
method this is accomplished?

In other words, does it only use the green channel to create the scan or
does it take a RGB scan and then discard the R and B channels? Or do
some create some type of mixed channel file?

In Photoshop, when I take an RGB scan and convert it to greyscale in the
"Image-Mode" menu, and the program indicates "discard color information"
is Photocopy really just dumping the R and B channel info and using the
G as the full greyscale info?

Indeed, if this is the case, then desaturation might prove best.


TonySleep@halftone.co.uk wrote:

> On Thu, 31 Jan 2002 22:58:10 +1100  Op's (martin@wollongong.apana.org.au)
> wrote:
>>Then what happens when an image scanned in colour is desaturated in
>>Photoshop and printed
>>with colour inks. Epson do say, as you mentioned also, that by printing
>>in this manor gives
>>a smoother gradient.
>>By keeping the scan colour RGB and desaturating it there is more
>>information kept than
>>scanning in grey scale.
> I agree with this. Scanning greyscale usually only uses one channel (green,
>  typically). You get much smoother tones and lower apparent grain
> by scanning RGB and then discarding colour information.
> Regards
> Tony Sleep


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