Gav what makes an artist choose between a B&W or colour image……. That’s the question
I will have a go at this, at least in terms of my personal views. In general, I prefer looking at, and making, black and white images over colour, but certainly not to the exclusion of colour. I am also (ignoring my interests in wildlife), mainly interested in landscape.
Beyond the subject itself, I am primarily attracted to the shapes, form, textures, tonality and colours in and around the subject. And it's an attempt to "balance" these aspects that can make an interesting subject into an interesting photograph, or indeed, a rather ordinary subject into an extraordinary photograph.
I find it easy for colour to dominate a photograph, and overpower the subject. So the use of colour needs to be a conscious decision for when it's considered important for the photograph. I also think that colour works best when the photographer has consciously "colour graded" the image to enhance the "feel" they want to convey with the photograph. By colour grading I mean careful and subtle manipulation of colour, contrast and saturation, in a manner that is sympathetic t he subject and reflects the photographers feelings towards the subject.: not "enhancing" reality to make eye grabbing photographs that "pop".
I find "Realistic" colours rather disappointing, compared to reality as they seem either unrealistic or over saturated and over-sharpened. No one likes scientifically realistic colours, so we are always fighting against the fact that none of of us see colours as they really are, and we all see colours slightly differently to each other.
I try to make the colour or B/W decision at the time of making the exposure whether a picture is "all about the colours" and the subject itself isn’t that important, or whether colour is essential to convey some important aspect of the subject. I usually try and "see" the image in front of me as a final print., which I also find useful for tweaking composition.
Other than that, I tend to be more interested in the shapes, forms, textures and tonality of an image where the subject and surroundings are more graphical than colourful. But finding images that work in black white, is at least as difficult, if not ,more difficult than finding those that work in colour. It certainly seems much easier to produce "OK" colour images than "OK" black and white images. Very rarely, will an image taken with colour in mind work as a black and white, but if I like the subject enough, making a colour image will often save an image I had originally visualised as being black and white.
Because I can often rescue a failed black and white image (but rarely the other way round), I am primarily seeing the world in black and white, except for when its screams "this needs to be in colour". I find it difficult to actively think/visualise in colour and black and white at the same time, so although I occasionally have days, when I find myself concentrating on colour images, I don't often switch during the day, unless, as explained above, something demands colour.
So, overall, and with the exceptions mentioned. it's the subject that chooses whether I photograph it with black and white or colour in mind and, most of the time, this also decides whether the final image is in colour or back and white.
In practise, I'm not as organised and structured as this suggest, but the overall principles still underpin how I choose between colour or black and white.