XRD images or diffraction spots are black and white. SEM images too. In fact, I think any atomic scale image is black and white. Why are they colorless?
There is no color data in them. Actually this type of images are invisible for human eye. That what is presented is just visualization of the spatial distribution of energy that is obtained using related sensors. The level of gray in the B/W image represents the level of sensor signal.
It is possible to make them in color using so called pseudo-coloring process that provides that selected range of signal be represented by color instead of level of gray.
In the case that you have clear idea about that what color addition could to contribute to visualization there is a nice challenge for your further research.
Good luck.
X ray is not in visible reign. the human eye as a sensor to the color can not recognize any energy out of visible spectra. therefore it will sense to high intensity area as white and low intensity area as dark.
These spots are obtained from a sensor after the detection of either x-rays are electrons. No one can see x-rays or electrons by eye. So it is indirect way of observing the energy location. Black and white image only indicates the intensity levels of sensor signal. However one can divide different signal levels to be observed in different color.
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