T-Max?

You need to stay in RGB anyway if you use Photoshop to apply a tint/tone to the B&W image. I usually use a Hue/Saturation adjustment layer with Colorize checked and settings somewhere around 32/16/0 for a sepia tone. But you can make a pretty wide variety of looks simply by tweaking the hue and saturation values.

Since PK sharpener works only on RGB images, what is the best workflow if, ultimately, you want a B&W image?

Just convert to RGB, sharpen, and then convert back to grayscale, if that's what you're working in.

Michael

OK. I am using a Canon 20D. After converting in Adobe Camera RAW I then have an RGB image which I can then capture sharpen. I then convert to monochrome (desaturate or channel mixer) and manipulate, but I have to stay in RGB to do the output sharpening. Then, finally I convert to grayscale in order to print (either with QTR or through the Epson driver on my 2200). Does that sound right?