The duotone mode in Photoshop allows you to convert a greyscale image into two to four channels. If the image is converted via Image › Mode › Duotone,  this can either be done via one of the many presets or by selecting Custom. If the custom variant is chosen, the number of channels should be set: Duotone for two, tritone for three and quadtone for four channels. The colour selector of a channel can be opened by clicking on the respective colour field. If the control panel of the colour libraries is selected, a Pantone tone can be selected to represent a RISO equivalent. Alternatively, an RGB, CMYK or LAB value can be entered. The corresponding colour values to the RISO colours can be found in the colour table found in this chapter. If the different channels and their primary colours have been set, the associated colour channels can be adjusted by selecting the duotone curves. After a curve has been changed and the action is confirmed by clicking on ok, the preview image is updated. If the adjustment of the channels and the resulting colour tones are acceptable, the separation can be confirmed by clicking  ok.

The duotone mode in Photoshop allows you to convert a greyscale image into two to four channels. If the image is converted via Image › Mode › Duotone,  this can either be done via one of the many presets or by selecting Custom.  If the custom variant is chosen, the number of channels should be set: Duotone for two, tritone for three and quadtone for four channels. The colour selector of a channel can be opened by clicking on the respective colour field. If the control panel of the colour libraries is selected, a Pantone tone can be selected to represent a RISO equivalent. Alternatively, an RGB, CMYK or LAB value can be entered. The corresponding colour values to the RISO colours can be found in the colour table found in this chapter. If the different channels and their primary colours have been set, the associated colour channels can be adjusted by selecting the duotone curves. After a curve has been changed and the action is confirmed by clicking on ok, the preview image is updated. If the adjustment of the channels and the resulting colour tones are acceptable, the separation can be confirmed by clicking  ok.