Digital BW, The Print

Todd,

I did the same thing as Tim, created a new Photoshop grayscale file 
(Gray Gamma 2.2) 2000 x 2000 pixels and filled it edge-to-edge with a 
gradient. I then converted it to LAB mode then to RGB mode (sRGB 
IEC61966-2.1 with a gamma of 2.2).

I repeated converting 8-bit to 16-bit to RGB mode path.

I repeated this using the Multichannel workflow Dan Culbertson 
suggested in Message #621. Grayscale convert to Multichannel mode, 
add 2 duplicate channels of the grayscale convert to RGB mode.

I have posted the histograms for all three workflows in the Files 
sections of the group homepage along with Tim's Grayscale to RGB 
conversion histograms.

It appears that the Multichannel workflow is the only one of the 
three that preserves the histogram intact.

Martin



 --- In DigitalBlackandWhiteThePrint@y..., Todd Flashner 
<tflash@e...> wrote:
> > Tim,
> > 
> > Your Histogram images are now in teh "File" section of the group
> > homepage in the folder "Message Related Files" and the file
> > description contains the # of your original post.
> > 
> > Very interesting. Looks like the grayscale to RGB conversion in
> > Photoshop is not so great! Did you try it in 16-bit?
> > 
> > Martin
> 
> While we've got Tim working..... Have you tried a Grayscale>Lab>RGB
> conversion, and Dan's multi-channel approach? ;-)
> 
> Todd