Envelope options determine how art is distorted to fit the envelope. To set envelope options, select the envelope object and click the Envelope Options button  in the Control panel, or choose Object > Envelope Distort > Envelope Options.

Anti‑Alias

Smooths rasters when distorted with an envelope. Deselecting Anti‑Alias can decrease the time it takes to distort rasters.

Preserve Shape Using

Specifies how rasters preserve their shape when distorted by nonrectangular envelopes. Select Clipping Mask to use a clipping mask on the raster, or Transparency to apply an alpha channel to the raster.

Fidelity

Specifies how precisely you want the object to fit the envelope mold. Increasing the Fidelity percentage can add more points to the distorted paths and increase the time it takes to distort the objects.

Distort Appearance

Distorts appearance attributes (such as applied effects or graphic styles) along with an object’s shape.

Distort Linear Gradients

Distorts linear gradients along with an object’s shape.

Distort Pattern Fills

Distorts patterns along with an object’s shape.

Note: If you expand the envelope with a Distort option selected, the respective property is expanded separately.