You can remove a screen set from an object in a PDF file, whether the screening is from DotShop or from the creation software used to create the file, (that is, unknown screening).

1. In the Acrobat window, select the object (or objects) to remove screening from.
2.  In the DotShop Properties Editor toolbar, click the Delete selected objects' screens button .

The selected screening is reset to the default screen for the page. The outline of the object or objects changes from red (or blue) to green (or the highlight colors you specified in DotShop preferences), indicating that the objects do not have screening applied.