Newton's Prism Experiment and Goethe's Objections

11. Single Ray / Linear Spectrum / Illuminant Equal Energy /
Compr. Type A / CIELab
This is not the prism experiment. The wavelength is now linearly distributed along the horizontal
axis. Graphics like this appear often in text books, mostly wrong though.
Modern spectrophotometers use gratings instead of prisms.Then the bar would look like here.
The table shows linear RGB values. Instead of Lab values (the same as on the previous page)
the CIE XYZ values are shown. The bars were calculated with gamma encoding for sRGB.
No gamut compression, no RGB gamma encoding
Lam X 100 Y 100 Z 100 R G B
0.38 0.1 0.0 0.6 0.3 -0.3 1.8
0.39 0.4 0.0 2.0 0.9 -0.8 5.5
0.40 1.4 0.0 6.8 3.0 -2.6 18.5
0.41 4.4 0.1 20.7 9.1 -8.0 56.5
0.42 13.4 0.4 64.6 27.4 -24.5 175.7
0.43 28.4 1.2 138.6 53.9 -49.9 376.9
0.44 34.8 2.3 174.7 56.7 -56.6 474.6
0.45 33.6 3.8 177.2 37.6 -46.1 480.4
0.46 29.1 6.0 166.9 4.6 -25.5 450.9
0.47 19.5 9.1 128.8 -37.9 8.9 345.1
0.48 9.6 13.9 81.3 -78.8 51.5 213.2
0.49 3.2 20.8 46.5 -114.2 96.5 115.0
0.50 0.5 32.3 27.2 -157.2 156.2 56.6
0.51 0.9 50.3 15.8 -209.6 240.0 16.6
0.52 6.3 71.0 7.8 -236.0 324.8 -14.9 0.53 16.5 86.2 4.2 -206.5 371.9 -31.1 0.54 29.0 95.4 2.0 -136.6 384.8 -40.0 0.55 43.3 99.5 0.9 -32.9 368.9 -43.2 0.56 59.4 99.5 0.4 100.8 329.1 -42.3 0.57 76.2 95.2 0.2 256.4 267.1 -38.1 0.58 91.6 87.0 0.2 416.0 189.7 -31.8 0.59 102.6 75.7 0.1 551.3 108.5 -24.5 0.60 106.2 63.1 0.1 630.4 39.3 -17.5 0.61 100.3 50.3 0.0 631.4 -7.2 -11.8 0.62 85.4 38.1 0.0 556.8 -28.9 -7.6
0.63 64.2 26.5 0.0 427.0 -32.0 -4.7
0.64 44.8 17.5 0.0 301.6 -27.0 -2.7
0.65 28.3 10.7 0.0 192.4 -18.9 -1.5
0.66 16.5 6.1 0.0 112.4 -11.6 -0.8
0.67 8.7 3.2 -0.0 59.7 -6.3 -0.4
0.68 4.7 1.7 0.0 32.0 -3.4 -0.2
0.69 2.3 0.8 -0.0 15.5 -1.7 -0.1
0.70 1.1 0.4 -0.0 7.8 -0.9 -0.1
0.70
0.66
0.62
0.58
0.54
0.50
0.46
0.42
0.38
λ / µ m
15
With gamut compression, no RGB gamma encoding
Lam X 100 Y 100 Z 100 R G B
0.38 0.0 0.0 0.0 0.0 0.0 0.1
0.39 0.0 0.0 0.1 0.1 0.0 0.2
0.40 0.1 0.0 0.2 0.3 0.0 0.5
0.41 0.3 0.1 0.5 1.1 0.0 1.2
0.42 0.8 0.4 1.5 3.4 0.0 4.0
0.43 2.5 1.2 5.2 9.3 0.0 13.6
0.44 4.9 2.3 11.1 17.7 0.0 29.3
0.45 8.3 3.8 21.1 26.7 0.0 56.1
0.46 13.6 6.0 45.1 31.3 0.0 120.3
0.47 15.8 9.1 74.5 0.0 12.5 198.2
0.48 11.7 13.9 33.0 0.1 41.1 83.3
0.49 13.6 20.1 26.3 0.0 65.3 62.5
0.50 17.5 27.6 28.8 0.0 91.7 65.8
0.51 23.6 38.5 34.5 0.1 129.5 76.2
0.52 29.1 50.3 33.7 0.2 172.3 68.8
0.53 31.7 58.6 25.0 0.0 204.8 41.5
0.54 32.0 63.6 12.0 0.0 226.4 3.7
0.55 40.4 65.7 10.6 62.6 215.8 0.0
0.56 48.3 65.7 10.3 128.8 196.1 0.3
0.57 54.7 63.5 9.4 191.4 169.3 0.0
0.58 59.6 59.0 8.4 250.6 136.0 0.3
0.59 58.4 52.8 16.1 255.0 110.1 24.2
0.60 55.0 45.8 15.7 254.5 85.1 26.4
0.61 50.9 38.5 12.0 254.3 59.7 19.4
0.62 46.8 31.2 7.3 254.9 34.4 10.2
0.63 42.7 23.9 3.2 254.9 9.1 2.3
0.64 34.6 17.8 2.2 213.4 0.0 1.5
0.65 20.8 10.7 1.8 127.5 0.0 2.1
0.66 11.9 6.1 1.3 72.9 0.0 2.0
0.67 6.3 3.2 0.9 37.9 0.0 1.6
0.68 3.3 1.7 0.6 19.9 0.0 1.2
0.69 1.6 0.8 0.3 9.6 0.0 0.7
0.70 0.8 0.4 0.2 4.8 0.0 0.4