This image was created from HST data from proposal 12436: M. Showalter (SETI Institute) and D. Hamilton (University of Maryland).
This image was originally black and white and recorded only overall brightness. These brightness values were translated into a range of bluish hues. Such color "maps" can be useful in helping to distinguish subtly-varying brightness in an image. The colors in this image are not what human eyes would see looking at Pluto.