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I can't imagine how one would achieve these colours? It looks like there's only red and gray in the image. Any idea's?

enter image description here

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I can't imagine how one would achieve these colours?

There are two light sources, each with its own color. There's the very flat, cool, white light from the overcast, early morning or late afternoon sky. And then there's the very warm orange light coming from the doorway and windows. The color of that light is probably exaggerated by setting the white balance so that the blue-ish sky light look white, which makes warm (tungsten?) light seem even more orange.

Whatever the details, the key here is that there are two different colored light sources. You can get a similar two-toned effect with a pair of flashes gelled to different colors.

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    I'm not sure that's quite the full answer - without post processing (not only WB change), I find it difficult to imagine such a lack of other colorings. – nbubis May 6 '18 at 16:14
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    Probably has the sat turned down on some colors as well, but I think this answer gets one 90% of the way there. – Hueco May 6 '18 at 17:54
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    @nbubis It's not called a gray day for nothing. What other colors are you expecting, and where would they come from given the two light sources? – Caleb May 7 '18 at 1:49
  • @Caleb There would be some blue spilling down from the overcast sky. Blue is nearer the middle of the visible spectrum and on the other side of the color wheel from the orange on one side and the pink/magenta on the other end that are both present in abundance – Michael C May 8 '18 at 19:55
  • Also notice that the white banners in the alley are white with no color cast. That means they are getting red, green, and blue light. – Michael C May 8 '18 at 19:58
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It's likely that the image has had its color saturation selectively adjusted, with red hues emphasized and other colors desaturated.

To achieve a similar effect, you'll first need to start with an image that has a variety of different colors present — color adjustment alone cannot create differences in hue where none exist in the original. As Caleb notes, a good starting point is a scene illuminated by multiple light sources with different colors, like diffuse light from a blue sky and the warm yellow-red glow of candle flame or an incandescent light bulb.

That said, other sources of color variation can work, too. For example, here's a shot of a colorful winter sunset in Helsinki that I grabbed with my cell phone last year:

Original photo

Let's say I wanted to make the sky gray and to emphasize the red glow of the sunlit clouds. One way to do that would be to selectively desaturate the blue and green parts of the photo, while maybe even increasing the saturation of the reds (and leaving the saturation of yellows and purples at intermediate values).

Here's a quick screenshot of how this might look like, using the Hue-Saturation tool in GIMP:

Screenshot of selective color saturation adjustment in GIMP

Admittedly, the preview in the screenshot above looks a bit crude and garish, since the saturation adjustment tool in GIMP really doesn't offer much fine control. Other image editing programs may have better built-in tools for this purpose, but it's also possible to achieve finer control using manual layer masking to blend the original image with a desaturated version of it. For example, here's the result of a few minutes of playing with the example photo above:

Selectively desaturated photo using manual layer masking

In particular, note how I manually edited the layer mask to desaturate the city lights in the background, while leaving the blue highlights on the building visible. That's not something one can easily do using just automatic color adjustment tools.

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It's called Selective Color

Although masking techniques can be used to create such an image, most of the time one can use a simple Hue-Saturation-Luminance tool that is contained in many photo editing applications to accomplish very close to the same thing with a lot less effort.

Suppose I want to edit this photo to only show the blue in the sky and leave everything else B&W:
original image

I would only need to adjust the saturation of all the other colors to zero with an HSL tool (I boosted saturation of blue and aqua while reducing the saturation of all other colors to the minimum. Reducing the luminance values for blue and aqua also caused those colors to become deeper):
HSL blue/aqua blue/aqua

But then I change my mind and want Red instead. No problem:
red
Or green:
green/yellow
Or even the pinkish/purplish color of the costumes' waists:
Pink
Notice that this last one demonstrates some "overlap" where some of the red flags in the scene have areas that are just over the line from red into magenta to leave them partially colored. To eliminate the reds one would need to either mask those parts to grey or use a tool that allows user defined widths of the specific color bands. The elementary HSL tool I'm using doesn't include such a feature, but some HSL tools do.

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