The Digital Zone System Gradient Panel is an extension panel which is designed to be used as a visual reference as it shows both the Lightness values and also the corresponding zones for a particular shade of grey. The panel has been designed to work across the three main working colour spaces, sRGB, Adobe RGB 1998 and ProPhoto RGB.
Watch a small video on the Digital Zone System Gradient Panel at https://www.digitalblackandwhite.co.uk/zone-gradient-photoshop-extension-panel
