After long time I installed LightZone for Linux software again on my laptop, to see if it could give me some new perspectives on this Tower hotel series of mine. It is far less advantageous than Nik Collection Silver Efex Pro, but as a Ubuntu Linux user (at my home laptop), I have to get along with what works on Linux.

Here I have run filter called 'Alien Infrared', with default settings, and it alone gives some new ways to alter black and white images.

And lesson learned this weekend. Do not use camera presets to record images directly on black and white! Shoot always in colors to be able to adjust color filters afterwards on photo editor.

UPDATE: After getting some feedback elsewhere, I must say the ideal would be to shoot "JPEG+RAW (with black and white JPEG scene preset)", if the camera, computer's processing power, and memory space available makes it possible ;-)

Some further reading: erickimphotography.com/blog/2016/10/25/how-to-shoot-black-and-white-street-photography