To measure the effectiveness of detergent in removing stains, I've decided to use Adobe Photoshop to measure the 'brightness'of stain left on the fabric pieces. Using the 'Colour Sample Tool', I plotted 4 random points on each stain and then found the average brightness of the stian, with the use of the HSB colour scale.
HSB stands for Hue, Saturation, Brightness. In this case, I only took the brightness to consideration, which is measured in percent from black (0) to white (100).
Using Excel, I plotted this rough chart using the data I got using Photoshop:
still looks a little weird, but it's only a rough graph.
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