MethodicalProgrammer t1_iu93j04 wrote

Because averaging colors is arbitrary and the results depend on the color space. The tool they used averages colors in non-linear sRGB which gives unexpected results when doing any kind of color math like averaging and interpolating. They could convert to a linear or perceptually uniform color space like CIEXYZ or CIELab, average, and convert back to sRGB to get a more expected result, but it's still an arbitrary result.