Add gradient color layer on photo and make it with a special effect.
Create assets with gradient color for your art creation.
.Tap on Plus button to add colors
.Tap on empty zone of image to show or hide buttons
.Tap on color tile to select or deselect
.Pan selected color-tile(s) onto another tile to rearrange colors
.Pan selected color-tile(s) onto Trash-can icon to delete
.Pan selected color-tile(s) onto Dropper icon to change color(s)
.Drag the blue or red point to adjust angle of gradient color
The iOS/macOS version of this app are both available in App Store.