Next, press G to grab the Gradient tool—this keyboard shortcut works in all three apps—and then choose a black-to-white, linear gradient. To do this in Photoshop, trot up to the Options bar ...

This 500-Piece Black and White Gradient Puzzle Is Your Next Quarantine Project. By Michele Debczak | ... It's just a basic color gradient transitioning from black at one end to white at the other.