In ArcMap 10.5 using an RGB composite image - for the Layer Properties/Symbology/RGB Composite there is an option displayed that provides Pan-sharpening. However, it is not possible to enable the option in version 10.5. Works in version 10.4.1. I do have a higher resolution image included in the data frame. Is this a bug or is there something new required in 10.5 for this option to work?