Quadtones
Quadtones, like Duotones and Tritones, are grayscale images that use process or Pantone colors to give a subtle color tone, almost like the sepia, blue and gold toning of the conventional darkroom but with much more control and repeatability. Photoshop has a selection of preset Quadtones in the Duotone folder found in the Preset folder.
(See Duotones and Tritones)
From the preset selection, this adjusts the grayscale without adding a colour hue and is ...
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