Transform Matrix Section

When a path with a gradient fill or stroke is subsequently transformed (scaled, rotated, or sheared), the gradient internally stores this transform using a mathematical construct called a matrix. This can lead to several issues. For example, if the path’s geometry is modified by certain Pathfinder operations, Illustrator resets the transform matrix, causing the gradient’s angle to change. Also, if the transform is non-uniform (caused by shearing or the equivalent rotation plus non-uniform scaling), the numerical values of the gradient’s length, angle and aspect ratio will not always agree with its visual appearance, even though the displayed values are technically correct in a mathematical sense. For these reasons, it is generally preferable to keep artwork free of transform matrices.

The Transform Matrix Alert icon is displayed whenever at least one gradient in the current selection has a transform matrix. Also displayed is the Reset button, which will remove each transform matrix from the selected gradients.

Gradiator Panel Reset Gradient Example

When Reset is used on a linear gradient, the gradient’s position is retained. Unfortunately, this is generally not possible with radial gradients. As a convenience, holding down Shift when clicking the Reset button will also reset the angle to 0°.