Digital BW, The Print

Dale,

I cannot speak to scanners specifically, but Photoshop converts to grayscale directly in the 
red channel.  ie,    Image>Mode>grayscale  (100% red, 0% green, 0% blue)

There are other ways to grayscale, using various values of red, green or blue, but I would 
suspect that scanners use the same 100% red channel method.

Lincoln


- In DigitalBlackandWhiteThePrint@yahoogroups.com, "dale40203" <dhoff@...> wrote:
>
> How does an RGB scanner determine Greyscale equivalents? Is there a formula it applies 
to 
> the three components? If so, would the color "fringing" I see on some RGB scans 
contribute to 
> a softening of Greyscale scans? 
> 
> The only way I can see to avoid this is for only one of the RGB components to be used, 
and I 
> know that would not be an accurate representation of RGB translated into GS.
> 
> Thanks,
> Dale Hoffman
>