Extended Data Fig. 7: iPhone camera imaging of SmURFP(biliverdin IXα) on sand.
a. Representative image collected of the same samples in Supplementary Fig. 12 using the iPhone 14 Pro 48-megapixel main camera. b. Responses to pC-HSL measured from each plate from the image’s red, green, and blue channels. The means were calculated by averaging over the area of each plate. The intensity measured in each channel can range from 0 to 254. The data points are three replicates. c. The same image from panel a with brightness and contrast values increased using Adobe Photoshop (v. 25.3.1). d. Responses to pC-HSL measured from the altered image. e. The same image from panel a with the “Find edges” filter applied in Photoshop to all color channels or to single color channels after decomposition of the image into red, green, and blue color channels. No response was successfully extracted from the iPhone camera image with or without additional processing. No other manipulations or enhancements of the color channels in the RGB image led to observable HSR.
