A photo created on April 29 2015 by Bartosz Wojczyński, an amateur astronomer. This is his technical explanation:
Due to non-standard filtering, this photo shows a little broader range of the visible spectrum than a computer monitor is able to reproduce. The colors are slightly off as compared to what a human eye would be able to see provided enough saturation, but it’s close enough to RGB so that there wouldn’t probably be much difference aside from less vibrant hues.
Thanks to the enhanced coloration, it’s possible to examine the differences in the chemical composition of the lunar surface. For example, the bluish tint of several areas indicates a titanium-rich soil.
