It gradually changes the alpha value from 255 to 0, causing the color to get more and more transparent. This option is very useful when working with softly blended collages or fog effects. You can also choose use one of the many custom gradients, or make your own gradient with the powerful Gradient Editor , in the Custom from Editor option. There are no fewer than nine different gradient types, as described below. The default gradient type is Linear , which produces a smooth transition from one color to another.
Bilinear mirrors linear.
By this we mean that Bilinear places the FG color in the middle, and then makes the transition to BG color in both ways. The result often resembles metal pipes, especially if you drag only a short distance. The Square gradient produces a square blend, imitating the visual perspective in a corridor. T he effect of the symmetric and asymmetric conical gradients is like looking at a 3-D cone from above. The Shapeburst gradients are not affected by drag direction, distance or position.