This is the manual / documentation for the gradients packs from graphicxtras.com: how to use the Photoshop gradients in Photoshop (R) and Photoshop (R) Elements; how to install the Photoshop GRD files; how to use them to create Photoshop frames; how to use with styles; use in animations; use in 3D; Photoshop Extended uses; how to load GRD files; use gradients with blending modes; opacity uses; how to modify gradient stops; gradient tutorials and much more. All the examples in the document are from gradients packs from graphicxtras.com Adobe and Photoshop are registered trademarks of Adobe Systems Incorporated. Screenshots are with kind permission of Adobe Systems Incorporated.
Please note that the manual was created for CS5 etc but many of the points are still valid with CC 2017 CC 2015 etc
http://www.graphicxtras.com/products/psgrad.htm