Combine In Colour

My Wife doesn't like the picture..... She hasn't seen it yet but I know she won't. Why do I know that? Because she isn't a fan of the "black and white with a bit of colour" images. I'm hopefully this might change her mind. Normally I would isolate a single colour of area of the image to make it stand out from the rest of the photo. With this image however I tried something a little bit different. 

The image was taken in the Cambridgeshire countryside on a warm morning in late July at the start of the harvest season. At the time I was actually standing in the Cambridge American Cemetery (visiting with my  Wife and Mother in Law on an American road trip weekend - a story for another time). 

Through the viewfinder at the time it was the perfect summer scene. The rolling hills and the harvest taking place in the centre - the whole image nicely framed by the trees. After the event however the combine in the centre seemed lost amongst all the greenery. I then started to play about with bring the machinery out of the nature around it. I came up with the what I call the "Colour Brush effect." I made the whole image monochrome but retained the colour in the centre. A colour stamp in the middle go black and white. I would love to get peoples thoughts on the effect.

Taken with a Canon70D with a Canon EF-S 18-200mm f/3.5-5.6 IS / Iso 500 /  F9