Digital BW, The Print

>
> I am experimenting with duotones and quadtones for printing b/w images 
> on my
> CanonS800 (with standard color ink tanks) from digital camera color 
> photos.
> I am only using duotone and quadtones that are blacks and grays. Now 
> maybe I
> can restate my questions.
>
> When saving the duotone image in Photoshop, is the image saved and 
> printed
> in Photoshop's native .psd gray format or is it converted back to RGB 
> before
> printing.

It is saving a gray file, untagged, with the contrast curves for each 
of your choosen inks being saved with it. You have asked two questions, 
the other about printing the file. A duotone file sent to the epson 
print driver still makes available choosing your ink/paper profile, but 
same as source is not available.  if you convert the duotone file to 
RGB prior to printing the same holds of course regarding the printer's 
profile but you can also choose same as source if you prefer to use the 
drivers color controls.

>
> If it is left as a duotone image in the .psd gray format, is there a
> standard or preferred Photoshop working space gray setting (e.g. dot 
> gain
> 20%, gamma, etc.) given that I use an inkjet printer?

I use Gamma 2.2, convert your properly prepared RGB file to Gamma 2.2, 
then to duotone.
Carolyn