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. 2019 Jul 25;9:10799. doi: 10.1038/s41598-019-47220-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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PC reconstructions of the forest scene. (A) Achromatic and chromatic PCA reconstructions from the forest scene data for a mouse (Mus musculus), a human (Homo sapiens), a bee (Apis melifera), a butterfly (Graphium sarpedon), a chicken (Gallus gallus domesticus) and a zebra finch (Taeniopygia guttata) and PC RGB pictures. The number of chromatic axes equals to the number of cone types minus 1. Again, the PC RGB picture is constructed from chromatic axes C_1-n. In PC RGB, the C₁ is shown as red, C₂ as green and C₃ as blue. (B) Opsin absorption curves showing the spectral sensitivity of the cones for each animal. The pink, blue, green and red curves correspond to UV, blue, green and red sensitive opsins, respectively.