Why is a black and white image called panchrome?

Question

Working with color

"pan" in Greek means "all". Those. it is logical to assume that panchrome should include all colors. However, in fact panchrome is a black and white image. Question. Why is that?

Answer 1

Panchromatic image - an image in which the brightness of each point is affected by the intensity of light of all wavelengths of the range. At the same time, when forming an image, the task of separating the recorded light waves according to the spectrum (as is done when shooting on a color film or with a color sensor) is simply not set. So the image is black and white.