Our search is giving a list of persons and their profile picture with some additional information, last updated, name & title.
As of now, we are grayscaling the profile pictures, with full color on hover.
Our initial idea was probably to ease the users ability to scan images with the same colors (eg. grayscale).
I know we should have tested this out on our users, but are there any (quantitative) studies around this, or anyone have experience with something similar?
PS: One argument against colors on hover is that touch screens (mobile, tablets) doesn't have the hover-state.