Black & White is a function that clarifies the white and black colors in an illustration.
Open ①the Layer window and ②duplicate the layer. Select ③the layer that was duplicated.
From ①the Tool Selection window, select ②Filter.
Select ①Black & White.
Drag ①the slider left and right to make adjustments.
Tap ②✓ to return to the canvas screen.
Open ①the Layer window and from ②blend mode, select ③Linear Burn.