Issues scaling image down

[CrimsonBlazer]

Hi everyone, my first post here. Was wondering if people could help me, I'm not very technically adept but am learning as I go. I'm trying to downsize an image so it fits within a template. The image size in question is A LOT bigger than the template I am trying to insert it into. When I go to rescale it to something smaller the colour becomes a more washed out, almost as if the saturation has been altered? I've tried to used all the different interpolation options to no avail.

Thank you for any help you can give.