Convert
the image to grayscale by choosing Image > Mode >
Grayscale. Only 8‑bit grayscale images can be converted to duotones.
Choose Image > Mode > Duotone.
In the Duotone Options dialog box, select Preview to
preview the image.
For the Type option, select Monotone, Duotone, Tritone,
or Quadtone.
Click the color box (the solid square) to open the color
picker, then click the Color Libraries button and select an ink
book and color from the dialog box.
Note: To produce fully saturated colors, specify inks in descending
order—darkest at the top, lightest at the bottom.
Click the curve box next to the color ink box and adjust
the duotone curve for each ink color.
Set overprint colors, if necessary.
Click OK.
To apply a duotone effect to only part
of an image, convert the duotone image to Multichannel mode—this
converts the duotone curves to spot channels. You can then erase
part of the spot channel for areas that you want printed as standard grayscale.
To apply a duotone effect to only part
of an image, convert the duotone image to Multichannel mode—this
converts the duotone curves to spot channels. You can then erase
part of the spot channel for areas that you want printed as standard grayscale.
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