Field Notes — How This Reading Works

This tool does not run a trained neural network. It analyzes the photograph pixel by pixel — converting color to hue, saturation, and brightness, then grouping pixels into healthy green, chlorotic yellow, necrotic brown, blackened, and powdery-pale tissue. It also maps the size and number of discolored clusters: many small flecks read differently than a few large blotches.

That combination of color ratio and spot pattern is a real, longstanding technique in plant pathology image analysis — but it is a heuristic, not a clinical diagnosis. Lighting, soil staining, and overlapping symptoms can all skew a reading. For valuable crops or an uncertain case, confirm with a local agricultural extension office or plant pathologist before treating.