If it is a calligraphy, there are only two colors, but if the color is set to cmyk, will it be four colors? If the color is set to gray, how many colors will there be?

You may be a little confused. How many colors to print is up to you. Whether you set CMYK or grayscale, you can choose to print four-color or black-and-white sheets, mainly depending on what color you want to print.

There are four films, namely C, M, Y and K * * *. Whether your color is set to grayscale or not, there are four of the four films. Calligraphy characters are black, so this black is also composed of four colors, but the printed color is not necessarily black visually, mainly depending on the CMYK value of calligraphy characters in your document, which may be biased towards C (blue) or M (red). Unless you use software to change the color of words to single black (K 100).

If it is a single sheet (that is, black and white film), there is only one film, and your document can be made directly from black and white or color black and white film, so printing can only use one color. Besides black and white, you can also print red, green and spot colors. There is only one color for you to choose from.

Choosing a four-color printer or black-and-white film is similar to choosing a color printer or black-and-white printer when printing documents, so you should always understand.