Color image segmentation metrics

Hi everyone. I am working in a color image segmentation project based on a HSV filter. Given an image, the goal is detect only a specific color. It is a pixel classification problem. The output is a RGB image, only one color are left in the picture and the remaining colors are in grayscale. But Im not sure how compute a quantitative metric to evaluate my results once I dont have a groundtruth. Someone can guide me?

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