🚀 go-pugleaf

Sorry, I neglected to address your grayscale images. You can print grayscale a number of ways....

1. As pure grayscale using only a single black ink.

2. As CMYK using a "Rich black", ie, black boosted with CMY inks for greater depth and smoothness.

3. As duotones, tritones, etc, using multiple black/gray inks, or even adding a warm or cool ink for slight toning.

If printing straight grayscale, you can convert to grayscale in Photoshop. Most common is 20% dot gain, but that is no guarantee that you images won't come out too dark or light. It depends on the paper, press, ink, process control, etc. Ask the printer if they know the dot gain for their press. Hopefully, they can give you an accurate, honest answer. Straight grayscale won't normally be as smooth as a rich black, but it should be neutral, since you are using only black ink.

For B&W images that need to be neutral, you Rich Black should have a heavy dose of black inks, with lesser quantities of CMY inks. Again, a heavy subject unless you are familiar with CMYK, separations, etc. Again, I'd try to find out the standards they strive to meet, then come back with additional information.

Lou