Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Eric Neilsen"
<e.neilsen2@...> wrote:
>
> I have done a bit more research on this and I think that the %s
given might
> be old hat. 

Eric, I suspect you are right.  I opened an sRGB color image in PSCS2
and made three duplicates.  The first I converted to grayscale
(Mode>Grayscale) using gamma 2.2 space.  The 2nd duplicate used
Hue/Saturation, and the saturation slider was totally desaturated. 
The 3rd duplicate used Channel Mixer and I played around with the
sliders. 

The mode conversion and desatuated images were totally different. 
Channel Mixer did not match either when set to 30R, 59G, 11B.  In
fact, it was tough to duplicate the mode conversion without also
adjusting the "constant" slider, and even that was just close.  

To me, it is a moot point, since I rarely find that any of the default
conversions work well (unless, as Paul Roark pointed out, you are
starting with a relatively low key image to begin with).  Sometimes a
single channel works, but I find I need to blend channels to get a
grayscale image that works.  

Lou