Digital BW, The Print

"Louis Dina" <lou@...> wrote:


> ...  All the information I can find suggests 30%R, 60%G, 10%B 
> is about right for a standard mode change.  ...

> Sometimes a single channel provides the best conversion, ...

With my older DSLR, the blue channel was very noisy.  With the new 
Canon 5D2, for at least some lenses, blue is sharper and noise free, 
at least outside the deep shadows.  The shorter wavelengths are 
affected less by diffraction, so it makes sense blue would be 
sharper, all else being equal.

> ... it's a matter of selecting and blending those channels 
> that give you the tonality distribution and separation you 
> want between tones. 

I split the RGB channels so that I can compare the B&W images of 
each.  Then I clone/pull image information from each as needed.

> Adobe decided 3/6/1 was a good "general" formula for the 
> "average" mode conversion, ...

And often if there is no significant color information in the shot, 
I'll just use their mode change.  It's easy.

Paul
www.PaulRoark.com