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This lesson demonstrates Photoshop’s Duotone filter; Duotones are greyscale photographs printed with two colours.
Undo and Navigation Steps
Two ways of undoing steps are from the top menu, Edit then Step Backwards. Alternatively, click a previous snapshot in the History Palette.
Navigate (zoom in and pan) your image using the Navigator Palette,
or the Zoom Tool. 
Activate The Hand Tool by tapping the Spacebar, keeping the Spacebar pressed, pan your image in the usual way. 
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Open your image onto Photoshop’s workspace.
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Then from the top menu, choose Image then choose Mode then choose Greyscale. (click OK to the Discard Colour Information dialogue). Remove Colour Tutorial.
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From the top menu, choose Image then Mode then Duotone, and you will see the following dialogue box.
Colour Order
When choosing your colours, ensure the darkest colour is at the top (Ink 1) and the lightest is at the bottom.
In the Type menu change the setting to Duotone. In addition to Duotone, you have the following choices.
I am converting my photograph to dark Sepia, therefore I am going to set the first colour to a dark brown. To do likewise, left-click to open Ink 1’s colour swatch.
This displays the Colour Picker palette. Locate your choice of colour, and left-click to set it.
Your first colour is now set.
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Now, click Ink 2’s colour swatch. 
This displays the following Colour Libraries Dialogue box.
Hover your cursor over the (rainbow) swatch above, and left-click a colour you like. This displays the colour’s range, in the left-side panel. Now, click a colour, then click OK to set it.
You should be able to view your photograph underneath the Colour libraries dialogue - if you like the change, click OK. If you don’t like the duotone, experiment with different colours.
5/ Duotone Curve dialogue box
To the left of Ink 1 and Ink 2, you will notice a box with a diagonal line through
it. If you click the box next to Ink 2. 
You will see the following Duotone Curve dialogue box.
This setting allows you to tweak the colour. Nudging the + upwards, causes the curve to arc, consequently darkening colour tones. Nudging the curve in the opposite direction causes the image to lighten. These settings are worth experimenting with. Additionally, you can click anywhere on the line to add points that can be manoeuvred.
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I am satisfied with my first (slight curve) adjustment, and will now click OK.
This changed my image to the following dark Sepia effect.
Experiment with different colours and create personal duotone images - and remember, you can choose between the following settings.
Wendi E M Scarth. Top of Page - Home.
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