Color-Matching:
To test whether models were successfully painted to color-match their
surrounding substrates we photographed each model in the field with a
ColorChecker Passport Photo with software version 1.1.2 (X-Rite Inc.
Grand Rapids, MI 49512, USA) in the frame. Using this color standard and
the ColorChecker camera calibration software plugin for Adobe Lightroom
Classic, we created digital negative (DNG) profiles that could then be
used to create images that were calibrated to their true colors, making
it possible to compare color values across all photos. After
calibration, a portion of the model lizard’s coloration was cropped from
the photo using ImageJ and compared with an exact sized crop of
substrate adjacent (~1cm) to the model. RGB (red, green,
blue) color values were obtained from each cropped photo using the Color
Inspector 3D v. 2.3, plugin for ImageJ. These color values were then
used to create a color overlapping index (COI) using the COI Function in
Rstudio (Samia and Francini 2015). We calculated COI scores, indicating
the percent color-match between substrate and model, for 40 models.