29:null 2a:["$","title",null,{"children":"CIE 1931 rg chromaticity diagram | Christophe Yamahata | Observable"}] 2f:T524,CIE_plot = Plot.plot({ inset: 20, grid: true, height: 450, width: 750, x: {label: "λ (nm) →"}, y: {label: "↑ Amplitude"}, style: { fontSize: "12px" }, marks: [ Plot.ruleY([0]), Plot.ruleX([435.8], {stroke: color_b, strokeDasharray: "4,3"}), Plot.ruleX([546.1], {stroke: color_g, strokeDasharray: "4,3"}), Plot.ruleX([700], {stroke: color_r, strokeDasharray: "4,3"}), Plot.ruleX([wavelength]), Plot.dot(selection, {x: "wavelength_nm", y: "r", fill: color_r, r: 5}), Plot.dot(selection, {x: "wavelength_nm", y: "g", fill: color_g, r: 5}), Plot.dot(selection, {x: "wavelength_nm", y: "b", fill: color_b, r: 5}), Plot.line(CIE_rgb_5nm, {x: "wavelength_nm", y: "r", curve: "catmull-rom", stroke: color_r}), Plot.line(CIE_rgb_5nm, {x: "wavelength_nm", y: "g", curve: "catmull-rom", stroke: color_g}), Plot.line(CIE_rgb_5nm, {x: "wavelength_nm", y: "b", curve: "catmull-rom", stroke: color_b}), Plot.text(CIE_rgb_5nm, {x: "wavelength_nm", y: "r", text: ["Red (r)"], fill: color_r, dy:-11, dx: 17}), Plot.text(CIE_rgb_5nm, {x: "wavelength_nm", y: "g", text: ["Green (g)"], fill: color_g, dy:13, dx:24}), Plot.text(CIE_rgb_5nm, {x: "wavelength_nm", y: "b", text: ["Blue (b)"], fill: color_b, dy:-11, dx:17}), ] })30:T56c,CIE_rgplot = Plot.plot({ inset: 20, height: 600, width: 730, grid: true, x: { label: "r →" }, y: { label: "↑ g" }, style: { fontSize: "12px" }, marks: [ Plot.image([{ url: CIE_rg_BKG }], { preserveAspectRatio: "none", x:-0.175, y:0.98, height: 512, width: 634, opacity: 0.8, src: "url" }), Plot.ruleX([0]), Plot.ruleY([0]), Plot.dot(selection, {x: 0.333, y: 0.333, marker: "circle-stroke", stroke: "black", fill: "white", r: 5}), Plot.text(CIE_rgb_5nm, {x: 0.333, y: 0.333, text:["E \n(White point)"], dx:0, dy:22}), Plot.dot(selection, {x: "r", y: "g", marker: "circle-stroke", stroke: color_grey, fill: color_dot, r: 8}), Plot.line(CIE_rgb_1nm, {x: "r", y: "g", curve: "catmull-rom"}), Plot.dot(CIE_rgb_5nm, {x: "r", y: "g", marker: "circle-stroke", stroke: "black", fill: "white"}), Plot.text(CIE_rgb_5nm, {filter: d => d.wavelength_nm >= 470 && d.wavelength_nm <=505, x: "r", y: "g", text: d => `${d.wavelength_nm}`, dx:-17, dy:7}), Plot.text(CIE_rgb_5nm, {filter: d => d.wavelength_nm == 510, x: "r", y: "g", text: d => `${d.wavelength_nm}`, dx:-6, dy:-14}), Plot.text(CIE_rgb_5nm, {filter: d => d.wavelength_nm >= 515 && d.wavelength_nm <=600, x: "r", y: "g", text: d => `${d.wavelength_nm}`, dx:16, dy:-8}), ] 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2d:{"id":"da31376e56072cfa","slug":"cie-1931-rg-colour-space","title":"CIE 1931 rg chromaticity diagram","thumbnail":"76f2e060e40d5f0c9210c61a689e4a74dc558be22663f383b39cc2dda7b7359c","access_level":"public","create_time":"$D2022-06-19T11:00:50.926Z","update_time":"$D2026-09-05T16:28:05.288Z","view_time":null,"first_public_time":"$D2022-06-19T14:44:47.609Z","has_unpublished_edits":null,"fork":{"id":"7dcef0ebff4028d9","slug":"input-chart","title":"Input + Chart","owner":{"id":"f35c755083683fe5","login":"observablehq","name":"Observable"}},"stars":0,"starred":false,"owner":{"type":"team","id":"dd67891d326bcfb1","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":"starter_2024"},"version":1010,"publish_version":1010,"role":null,"authored":false,"authors":[{"type":"individual","id":"06f083eba60f5a76","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":null}],"members":[{"type":"individual","id":"06f083eba60f5a76","login":"christophe-yamahata","name":"Christophe Yamahata","avatar_url":"https://avatars-next.observableusercontent.com/8256ac716aa8395babba412b2835913d186874fa4190df57a4a28f2e60129876","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":1,"collection":{"id":"79a85315e6323ef2","slug":"colour","title":"Colour","owner":{"id":"dd67891d326bcfb1","login":"christophe-yamahata","name":"Christophe Yamahata"}},"type":"notebook","body":{"title":"CIE 1931 rg chromaticity diagram","cells":[{"id":4,"value":"# CIE 1931 *rg* chromaticity diagram\n\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":374,"value":"

\n The CIE rg chromaticity diagram is built from the\n following r, g, (and b) values that are plotted as a function of the wavelength (λ, nm).\n

\n In this graph, there are three noticeable wavelengths that have been highlighted with vertical dashed lines: These lines correspond to the\n monochromatic primaries with standardized wavelengths of λ_b = 435.8 nm (blue, b=1), \n λ_g = 546.1 nm (green, g=1), and λ_r = 700 nm \n (red, r=1).\n

\n For each colour combination, we have the following relation:\n
\n r + g + b = 1.\n
Therefore, if we provide r and g, the value b becomes redundant and can simply be omitted. \n

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":37,"value":"$2f","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":446,"value":"viewof selection = Inputs.table(CIE_rgb_1nm.filter(d => d.wavelength_nm == wavelength), {\n columns: [\n \"wavelength_nm\",\n \"r\",\n \"g\",\n \"b\"\n ],\n\n header: {\n wavelength_nm: \"Wavelength (nm)\",\n r: \"Red (r)\",\n g: \"Green (g)\",\n b: \"Blue (b)\"\n },\n \n align: {\n wavelength_nm: \"center\",\n r: \"left\",\n g: \"left\",\n b: \"left\",\n },\n \n width: {\n wavelength_nm: 110,\n r: 60,\n g: 60,\n b: 60,\n },\n\n maxWidth: 700,\n \n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":615,"value":"
","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":386,"value":"viewof wavelength = Inputs.range([380, 780], {value: 525, step: 1, label: \"Wavelength (nm)\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":300,"value":"\n
\n

CIE rg chromaticity diagram

\n The CIE rg colour space is represented in a diagram where g is plotted as a function of r.\n In the following diagram, the corresponding wavelengths are displayed near their marker.\n

\n","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":112,"value":"$30","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":618,"value":"Inputs.table(CIE_rgb_1nm.filter(d => d.wavelength_nm == wavelength), {\n columns: [\n \"wavelength_nm\",\n \"r\",\n \"g\",\n \"b\"\n ],\n\n header: {\n wavelength_nm: \"Wavelength (nm)\",\n r: \"Red (r)\",\n g: \"Green (g)\",\n b: \"Blue (b)\"\n },\n\n align: {\n wavelength_nm: \"center\",\n r: \"left\",\n g: \"left\",\n b: \"left\",\n },\n \n width: {\n wavelength_nm: 110,\n r: 60,\n g: 60,\n b: 60,\n },\n\n maxWidth: 700,\n \n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":1001,"value":"

\n

Useful reference

","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":1003,"value":"Technical note: [Human vision and the CIE chromaticity diagram](http://dx.doi.org/10.13140/RG.2.2.31371.30242), idonus Sàrl, March 2024.\n[DOI: 10.13140/RG.2.2.31371.30242](http://dx.doi.org/10.13140/RG.2.2.31371.30242) \n*Document written by C. Yamahata.*","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":291,"value":"
","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":285,"value":"\n\n### Appendix \n### (*data and variables*)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","output":"","database":"$undefined"},{"id":34,"value":"CIE_rgb_5nm = FileAttachment(\"CIE_rgb_5nm.csv\").csv({typed: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":651,"value":"CIE_rgb_1nm = FileAttachment(\"CIE_rgb_1nm.csv\").csv({typed: true})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":715,"value":"CIE_rg_BKG = FileAttachment(\"CIE_rg_BKG.png\").url()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":80,"value":"color_r = \"#FF2424\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":88,"value":"color_g = \"#70AD47\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":262,"value":"color_b = \"#4472C4\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":844,"value":"color_dot = \"#b935d5\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"},{"id":837,"value":"color_grey = \"#b0b0b0\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W31","stdlib":"2","titling":"auto"}} 2e:"$2d:body"