B&W Colour Adjustment in Layers?

Richard Allen

• 27. September 2017 13:09

I have an image of a tall building with blue tinted glass against a blue sky.

I'd like to turn the image into B&W (not difficult, even for me) but then to be able to adjust the level of blue in the sky separately from the blue in the building.

I've made a Layer mask for the sky, converted to B&W and then with the sky layer mask selected attempted to change the blue in the sky to be deeper but all the blue in the images changes.

What am I doing wrong?

Any advice would be very welcome, thanks.

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  Ian Wilson

  Moderator

  • 28. September 2017 08:59

  

  I don't think you can do it like that. (The trouble is that the B&W tools where you can adjust individual colours don't work as a local adjustment.) But you could do this.
  
  (1) Make a mask that just selects the sky, and darken the blue in it to your taste.
  
  (2) Then switch back to the background layer and make the whole image B & W - you should find that the darkening of the sky carries over into the B&W conversion.
  
  It seems to work for me.
  
  Ian

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  Mike Katz

  • 28. September 2017 13:19

  I use the Color Editor to make B&W adjustments via a layer the whole time. Works brilliantly.
  
  Just remember that there are two versions of many tools, the layer adjustment version and the global version. The layer adjustment versions have a little paint brush next to their name.
  
  They work on the background layer as well, so I have these versions of the tool open on my second monitor and I use those.

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  Richard Allen

  • 28. September 2017 15:07

  Thank you Ian and Mike for your advice, I'll look at doing what you suggest.
  
  Your help is very much appreciated.

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  Permanently deleted user

  • 28. September 2017 23:33

  Richard:
  
  If the blue hues of the sky and the windows are different they may respond differently to b/w filtering. The colour sliders under the b/w tab mimik the filters used back in b/w film days when yellow, orange to red filters were used to increase contrast in the sky. Certainly worth a try how those filter settings work in your case.

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