Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Bill Morse"
<Bill.Morse@...> wrote:
>
> I don't believe that's true. You can test this with a Channel Mix 
> layer, just compare the conversion with and without.

Correct, Bill.  When converting from color to grayscale in Photoshop
(using Desaturate or Mode : Grayscale), Photoshop takes its tonal
values as follows: approximately 30% of the red channel, 60% of the
green channel, and 10% of the blue channel.  Works fine for some
images, but lousy for others.  "Usually", the green channel comes
closest to the true tonality, but even that is a dangerous statement,
depending on the colors and tonalities of the image.  Green is also
usually the least noisy channel, but again, not always.  Blue is
usually the noisiest.  

Channel Mixer, Calculations, Apply Image and numerous plugins do a
good job on color to B&W conversion.  You can also do quite a bit of
tonal manipulation in LightRoom.  

Lou