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Is there a way to remove the overlay color? Thanks in advance!
I know it is too late for your answer but still i found the solution.
There is default corev15.css with class .ms-tileview-tile-detailsBox in which background-color is specified which is defined for Promoted Links.
You can change the background-color:transparent in CEWP.
Es posible ingresando este codigo en un editor de scripts(It is possible by entering this code in a script editor)
Required, but never shown