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1 | 1 | {
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2 | 2 | "metadata": {
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3 | 3 | "name": "",
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4 |
| - "signature": "sha256:a0ab11c18521f3101b4f6371df5099073bcf88eb4fd49a86264d20effcb8f6e5" |
| 4 | + "signature": "sha256:caed3118ea7b3ca3709183aea6e87188579d51cb2bdacede452d29025025f7d7" |
5 | 5 | },
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6 | 6 | "nbformat": 3,
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7 | 7 | "nbformat_minor": 0,
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68 | 68 | "source": [
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69 | 69 | "*L. G. Glasser*, *A. H. McKinney*, *C. D. Reilly*, and *P. D. Schnelle* described a visually uniform colour coordinate system close to *Adams* chromatic-value system but where the quintic-parabola function has been replaced with a cube-root function: the *Cube-Root Color Coordinate System*.\n",
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70 | 70 | "\n",
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71 |
| - "*Lightness* $L$ in the *Cube-Root Color Coordinate System* is calculated as follows:<a name=\"back_reference_2\"><a href=\"#reference_2\">[2]</a></a>\n", |
| 71 | + "*Lightness* $L$ in the *Cube-Root Color Coordinate System* is calculated as follows: <a name=\"back_reference_2\"><a href=\"#reference_2\">[2]</a></a>\n", |
72 | 72 | "\n",
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73 | 73 | "$$\n",
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74 | 74 | "\\begin{equation}\n",
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105 | 105 | "cell_type": "markdown",
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106 | 106 | "metadata": {},
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107 | 107 | "source": [
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108 |
| - "> Note: Input *luminance* $Y$ is in domain [0, 100], output *Lightness* $L$ is in domain [0, 100]." |
109 |
| - ] |
110 |
| - }, |
111 |
| - { |
112 |
| - "cell_type": "markdown", |
113 |
| - "metadata": {}, |
114 |
| - "source": [ |
| 108 | + "> Note: Input *luminance* $Y$ is in domain [0, 100], output *Lightness* $L$ is in domain [0, 100].\n", |
| 109 | + "\n", |
115 | 110 | "The *colour.lightness* definition is implemented as a wrapper for various lightness computation methods:"
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116 | 111 | ]
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117 | 112 | },
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213 | 208 | "cell_type": "markdown",
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214 | 209 | "metadata": {},
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215 | 210 | "source": [
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216 |
| - "> Note: Input *luminance* $Y$ is in domain [0, 100], output *Lightness* $W$ is in domain [0, 100]." |
217 |
| - ] |
218 |
| - }, |
219 |
| - { |
220 |
| - "cell_type": "markdown", |
221 |
| - "metadata": {}, |
222 |
| - "source": [ |
| 211 | + "> Note: Input *luminance* $Y$ is in domain [0, 100], output *Lightness* $W$ is in domain [0, 100].\n", |
| 212 | + "\n", |
223 | 213 | "Using the *colour.lightness* wrapper definition:"
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224 | 214 | ]
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225 | 215 | },
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292 | 282 | "cell_type": "markdown",
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293 | 283 | "metadata": {},
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294 | 284 | "source": [
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295 |
| - "The *CIE $L^*a^*b^*$* colourspace approximately uniform colourspace defined in 1976 computes the *Lightness* $L^*$ quantity as follows: <a name=\"back_reference_4\"><a href=\"#reference_4\">[4]</a></a>\n", |
| 285 | + "The *CIE $L^*a^*b^*$* approximately uniform colourspace defined in 1976 computes the *Lightness* $L^*$ quantity as follows: <a name=\"back_reference_4\"><a href=\"#reference_4\">[4]</a></a>\n", |
296 | 286 | "\n",
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297 | 287 | "$$\n",
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298 | 288 | "\\begin{equation}\n",
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316 | 306 | "\\end{equation}\n",
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317 | 307 | "$$\n",
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318 | 308 | "\n",
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319 |
| - "The original $\\epsilon$ and $\\kappa$ constants values have been shown to exhibit discontinuity at the junction point of the two functions grafted together to create the *Lightness* $L^*$ function by *Bruce Lindbloom*.<a name=\"back_reference_5\"><a href=\"#reference_5\">[5]</a></a>\n", |
| 309 | + "The original $\\epsilon$ and $\\kappa$ constants values have been shown to exhibit discontinuity at the junction point of the two functions grafted together to create the *Lightness* $L^*$ function. <a name=\"back_reference_5\"><a href=\"#reference_5\">[5]</a></a>\n", |
320 | 310 | "\n",
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321 |
| - "[Colour](https://github.com/colour-science/colour/) uses the rational values instead instead of the decimal values for these constants.\n", |
| 311 | + "[Colour](https://github.com/colour-science/colour/) uses the rational values instead of the decimal values for these constants.\n", |
322 | 312 | "\n",
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323 | 313 | "> See Also: The [CIE $L^*a^*b^*$ Colourspace](../models/cie_lab.ipynb) notebook for in-depth informations about the *CIE $L^*a^*b^*$* colourspace.\n",
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324 | 314 | "\n",
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349 | 339 | "cell_type": "markdown",
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350 | 340 | "metadata": {},
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351 | 341 | "source": [
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352 |
| - "> Note: Input *luminance* $Y$ and $Y_n$ are in domain [0, 100], output *Lightness* $L^*$ is in domain [0, 100]." |
353 |
| - ] |
354 |
| - }, |
355 |
| - { |
356 |
| - "cell_type": "markdown", |
357 |
| - "metadata": {}, |
358 |
| - "source": [ |
| 342 | + "> Note: Input *luminance* $Y$ and $Y_n$ are in domain [0, 100], output *Lightness* $L^*$ is in domain [0, 100].\n", |
| 343 | + "\n", |
359 | 344 | "Using the *colour.lightness* wrapper definition:"
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360 | 345 | ]
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361 | 346 | },
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492 | 477 | "1. <a href=\"#back_reference_1\">^<a> <a name=\"reference_1\"></a>[17-680 lightness (of a related colour)](http://eilv.cie.co.at/term/680) (Last accessed 9 July 2014)\n",
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493 | 478 | "2. <a href=\"#back_reference_2\">^<a> <a name=\"reference_2\"></a>**Glasser et al.**, *Cube-Root Color Coordinate System*, *JOSA, Vol. 48, Issue 10, pp. 736-740 (1958)*, DOI: http://dx.doi.org/10.1364/JOSA.48.000736\n",
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494 | 479 | "3. <a href=\"#back_reference_3\">^<a> <a name=\"reference_3\"></a>**G. Wyszecki**, *Proposal for a New Color-Difference Formula*, *JOSA, Vol. 53, Issue 11, pp. 1318-1319 (1963)*, DOI: http://dx.doi.org/10.1364/JOSA.53.001318\n",
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495 |
| - "4. <a href=\"#back_reference_4\">^<a> <a name=\"reference_4\"></a>**Wyszecki & Stiles**, *Color Science - Concepts and Methods Data and Formulae - Second Edition*, Wiley Classics Library Edition, published 2000, ISBN-10: 0-471-39918-3, pages 167.\n", |
496 |
| - "5. <a href=\"#back_reference_5\">^<a> <a name=\"reference_5\"></a>**Bruce Lindbloom**, http://brucelindbloom.com/index.html?LContinuity.html (Last accessed 24 February 2014)\n" |
| 480 | + "4. <a href=\"#back_reference_4\">^<a> <a name=\"reference_4\"></a>**Wyszecki & Stiles**, *Color Science - Concepts and Methods Data and Formulae - Second Edition*, Wiley Classics Library Edition, published 2000, ISBN-10: 0-471-39918-3, page 167.\n", |
| 481 | + "5. <a href=\"#back_reference_5\">^<a> <a name=\"reference_5\"></a>**Bruce Lindbloom**, http://brucelindbloom.com/index.html?LContinuity.html (Last accessed 24 February 2014)" |
497 | 482 | ]
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498 | 483 | }
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499 | 484 | ],
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