What is a Transparency?
The term ‘transparency’ refers to a collection of features and capabilities in Photoshop, Illustrator, and InDesign that lets you modify the appearance of objects, particularly the way objects affect the appearance of underlying objects. Drop shadows, opacity, feathering, and blending modes are collectively referred to as ‘transparency effects’.When you apply ‘transparency effects’ to objects in Photoshop, Illustrator, and InDesign, the objects must be flattened before the PDF is created.