Fig. 4From: Investigation into the predictive performance of colorimetric sensor strips using RGB, CMYK, HSV, and CIELAB coupled with various data preprocessing methods: a case study on an analysis of water quality parametersProcrustes PCA score plots of a Mn2+, b Fe2+/Fe3+, c Cu2+, d NO3-, e PO43-, f SO42-, g pH, and h total hardness test stripsBack to article page