Duotone is a halftone image or photograph in contrasting colors like blue or black. Or duotone or duograph can be created by taking an image and superimposing one color over another. Or using a filter or setting. It’s a way to be creative with colors in pictures.
duotone windmill
I took an image of a windmill and converted two to soft, contrasting colors for a vintage look. Then I superimposed one photo over the other.
Marseilles Factory
I wanted to create a retro postcard effect with this photograph. I used complimentary colors in olive and blue, and olive is sort of a retro color.
duotone sky
I set my camera to Tungsten filter/light setting to create a dramatic duotone style cloudy sky.
These are my photos in duotone.
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Canoe Communications 
This is very cool! Love the windmill.
Thanks Gemma…it is a colorful way to liven up some photos.
i love it.. maybe i’ll try to experiment about doing that in the future..
it’s colorful, creative and fun…let me know how it works out
i would love to..
thanks for showing how it is actually done – I like the duotone sky. Never sure what image suits this effect best but then I cheat with my photo editing software
I’ll visit to see your duotones. 🙂
Thank you for showing us… I’m tempted to try, maybe in the near future.
If you have some so so photos, try duotone color to give them a new look.
interesting duotone experiments!
I like your duotone experiments. I’ve made a post about a much more complicated method that effects the whole photo. http://artifactsandfictions.wordpress.com/2012/11/17/greenish-hues/
I like the way you’ve got different tones in different parts of the image. I’m curious about how you did that. 🙂
I’ll stop by your blog to see your duotone pictures. I took a black and white photograph and made two copies of it. I changed each of the two copies to different colors, cropped one of them. I overlaid one color photo over the other.