Digital BW, The Print

I think what it is to which you are referring is the technique to
segment the various grey ink tones to grey shades of the print...

Consider the Epson driver: it creates grey shades by a balanced mixing
of cyan magenta and yellow inks to make grey. Thus the lighter shades
of a print above black will have small dots of CM&Y sprayed out on to
the paper. If the color inks are replaced with three shades of grey,
the Epson driver, if printing a B&W image, will do the same thing. The
result is that the darkest grey will be included in the very light
tones and visible dots will result.

Now a way to use only the light grey in the light areas, medium in
medium and the darkest grey ink in the shadows: If the lightest grey
is in the Yellow position, tell the Epson driver to print levels of
yellow ( 'color' ) and you will use Only the lightest ink for the
shades near white and render the print 'dotless'. Make areas of the
print a nice ugly magenta, and only the medium grey will be applied,
cyan colors in your RGB print (as shown on the monitor) will make the
dark greys.

So, your print must be converted to RGB, then turned in to intensely
colored areas to force the Epson driver to use an appropriate grey ink
for a particular grey level. If adjusted correctly, a segemented
workflow can create a wonderful dot free, fine quality black and white 
print !

Best,
Alex
> Can someone explain to a relative novice, why it is , in many
> worflows I've read, a grayscale file of a B&W image is converted
back
> into RGB before printing? How will the print differ if the grayscale
> file is printed?
>
>
>
> Thanks,
>
> Andrew