.ADO File Extension
Adobe Photoshop Duotone Options File
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What is an ADO file?
Settings file used by Adobe Photoshop, a graphics editing program; stores color transfer curves, which specify the properties of two colors that are used to generate a duotone image from a grayscale format in Photoshop; used for saving and loading duotone ink settings that can be applied to multiple images.
The Duotone Options dialog box can be accessed by selecting Image → Mode → Duotone... in Photoshop. ADO files can be loaded and saved using this window.