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I am looking for the easiest and quickest option to apply blue and white (or green and white) to an image.

Basically, I would like to have a shade of another color instead of gray scale in black and white effect.

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We should be able to do this from PS similar to Gimp as shown here: graphicdesign.stackexchange.com/questions/21780/… - the fill method probably just has another name. –  Takkat Dec 15 '13 at 17:53

2 Answers 2

Start with a greyscale image.

  1. Image > Mode > Duotone
  2. Click the Black Square and pick your blue
  3. Image > Mode > RGB (if your'e not creating an image for print).
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thank you! It works for me. –  Lynda Xu Dec 16 '13 at 1:47

The most versatile way would be via adjustment layers:

  1. Add blck & white adjustment layer to turn picture into greyscale
  2. Add gradient map adjustment layer and edit its gradient colors to ones you need (blue or green to white)

And of course you can do the same through menu, without layers, but layers add that extra tweaking possibilities. Here is more detailed explanation if you need one: http://www.photoshopessentials.com/photo-effects/gradient-map/

P.S. Step 1 could be ommited if I remember correctly.

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thank you this way is working for me too! –  Lynda Xu Dec 16 '13 at 1:47

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