Duotone filters are filters that you can apply to Image blocks, Cover blocks, Post Featured Image blocks, and individual images in Gallery blocks to change the highlights and shadows in an image to certain colors. After clicking on an image, you can select the circle icon in the menu to open the selections for duotone filters.
Select one of the default color palettes by choosing one of the circles. You can also set your own colors by clicking “Shadows” or “Highlights” to open up the color menu. Select from the default colors by clicking the corresponding circle, or open the color selector by clicking the gray and white checkered background.
To reset the image to its original colors, press the “Clear” button at the bottom right of the color selecting menu.