Placing a circle on a certain colour from an image

Hi,

I am trying to place a circle, in grasshopper, based on the location of a certain colour tone in an image (the yellow tone of the trees).

I’m not sure whether I need to use image sampling in some way and was hoping you could help me!

It is not going to be easy to extract well defined areas of a certain hue from that image data. I think it requires some significant pixel filtering none of which Grasshopper can supply.

You can use the image sampler and find the hue of a specific pixel, but I fear your noise to signal ratio is going to be through the roof.