Corel Knockout is described as 'When it comes to complex masking, you won't find anything more powerful than Corel KnockOut 2. Built as a plug-in for Adobe Photoshop, Corel PHOTO-PAINT and Corel Painter, it lets you retain the finest image details, including hair, smoke, liquid, fire, glass and shadows' and is an app. There are six alternatives to Corel Knockout for a variety of platforms, including Windows, Mac, Adobe Photoshop, Online / Web-based and PaintShop Pro. The best alternative is ClippingMagic.com. Other great apps like Corel Knockout are Fluid Mask, InstantMask, AKVIS Chameleon and Digital Film Tools EZ Mask.
Fluid Mask software is a set of advanced paint tools that cuts out highly complex images with absolute precision. Designed to make life easier for everyone who needs to mask images, it offers an intuitive, accurate and fast approach to cut-outs.
AKVIS Chameleon is an efficient masking software for photo collage and montage creation. It is fun to use and makes the process easy and entertaining. The software does not require precise selection of objects.
EZ Mask is an easy to use interactive image masking tool capable of extracting almost any object in an image--even if you are dealing with fine hair detail, smoke, or reflections. This extraction process creates what is known as a mask--essentially a black and white cutout.