Duotones are the subtle combination of two colours, usually black and one other
such as yellow or blue, but you can also combine two other colours such as blue
and green.
photoshop allows you to create a traditional duotone affect easily but you have to
convert the image to grayscale first. Landscape photographs look great when
duotones adjustments are applied to them.
The duotone process increases the tonal range of grayscale images and makes
images print better when in this mode.
An alternative to to duotone is colourizing an image using the Hue/Saturation
command.
In Photoshop carry out the following steps,
1. Open your photograph in Photoshop.
2. Image > mode > grayscale (to convert to black and white).
3. Image > mode > duotone (to create a duotone).
4. Select Duotone in 'Type' drop down menu.
5. Double click the white box at 'ink 2'.
6. A second box appears custom colours, from this you choose a colour i.e.
Pantone 1235C then click ok.
7. To the left of each colour box is a curves adjustment box, click this to open
and adjust the curve for each individual colour.
8. If you want to affect the entire image go to Image > Adjustments > Curves.
9. There are also preset adjustments, go to Load > Duotones,
These are split into 3 subfolders, Gray/Black, Pantone and Process Duotones.
Other colours to try Pantone 279C.
Alternatively using Hue/Saturation
1. Open your image in Photoshop.
2. Choose > enhance > Adjust colour > Adjust Hue/Saturation.
3. Tick colourize box in Hue and Saturation dialog, this will allow you to change all
the original colours with a single wash of colour.
4. By default the tint will be red, you can change the tint colour by dragging the Hue
slider, a hue of 44 will add a sepia wash where as a value off 133 will add a spooky
green wash, for a colder nocturnal look drag the Hue slider to 210 for a moody blue
tint.
5. Click ok to apply.
6. To enhance go to Enhance > Adjust lighting > Levels, drag the black input slider (rhs)
to the right to darken the image ( around 40), select ok to apply.