File:CIExy1931.svg

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Original file ‎(SVG file, nominally 476 × 540 pixels, file size: 27 KB)

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Illustration of the CIE 1931 color space. This is a vectorized version of Image:CIExy1931.png by User:PAR. The spectral colours are embedded as a JPEG raster image with SVG blur applied to allow scaling to any size. From the description of Image:CIExy1931.png:

The colors for this diagram were generated using the RGB color space in en:Adobe photoshop. The transformation from xy chromaticity coordinates was done using the en:sRGB color space specification on the [X,Y,Z]=[x,y,1-x-y] tristimulus values, then multiplying by a constant so that one of the R, G, or B values was maximized. Assuming that one's monitor converts Adobe photoshop RGB according to the sRGB color space (probably a good assumption) then, within the sRGB gamut, the chromaticities are correct, but are incorrect outside the gamut. (See the sRGB article for a description of the sRGB gamut). The process of maximizing the value of R, G, or B results in a distinct 3-pointed star in the diagram, centered at the D65 white point. This is because, although the chromaticities are correct, the luminosities (brightness values) are not equal across the diagram. If the luminosities were all made equal, then the entire diagram would be rather dark, since pure blue has a low luminosity. Any attempt to equalize luminosity to remove the star will reduce the overall luminosity of the diagram, and the star will not completely disappear until the diagram is very dark. Alternatively, we could blur the colors to get rid of the star, which would give incorrect chromaticities. I have opted for correct chromaticities at maximum brightness, thus the presence of the star.

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Author Sakurambo
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XYZ → RGB conversion[edit]

The colour values in the embedded bitmap image were calculated based on pseudocode available at easyrgb.com archive copy at the Wayback Machine

Licensing[edit]

I, Sakurambo, the copyright holder of this work, hereby publishes it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
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attribution share alike 		This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Attribution: I, Sakurambo
You are free:
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  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
Attribution: I, Sakurambo
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.

File history

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Date/TimeThumbnailDimensionsUserComment
current21:14, 27 December 2021Thumbnail for version as of 21:14, 27 December 2021476 × 540 (27 KB)Crissov (talk | contribs)Reverted to version as of 11:16, 22 February 2020 (UTC)
23:36, 25 May 2021Thumbnail for version as of 23:36, 25 May 2021476 × 540 (21 KB)Locke Cole (talk | contribs)Reverted to version as of 10:20, 9 June 2011 (UTC)
11:16, 22 February 2020Thumbnail for version as of 11:16, 22 February 2020476 × 540 (27 KB)Crissov (talk | contribs)cleaner source code with semantic IDs
10:20, 9 June 2011Thumbnail for version as of 10:20, 9 June 2011476 × 540 (21 KB)Perhelion (talk | contribs)fix
07:22, 9 June 2011Thumbnail for version as of 07:22, 9 June 2011476 × 540 (38 KB)Amada44 (talk | contribs)fix
17:42, 14 July 2007Thumbnail for version as of 17:42, 14 July 2007476 × 540 (25 KB)Sakurambo~commonswiki (talk | contribs)Replaced embedded bitmap with new version that hopefully resembles Image:CIExy1931.png more closely
13:51, 13 July 2007Thumbnail for version as of 13:51, 13 July 2007476 × 540 (24 KB)Sakurambo~commonswiki (talk | contribs)Include "Nimbus Roman No9 L" in font alternatives. Hopefully this will look similar to Times when rendered by wiki software
13:44, 13 July 2007Thumbnail for version as of 13:44, 13 July 2007476 × 540 (24 KB)Sakurambo~commonswiki (talk | contribs){{Information |Description=Illustration of the en:CIE 1931 color space. This is a vectorized version of Image:CIExy1931.png by User:PAR. The spectral colours are embedded as a JPEG raster image with SVG blur applied to allow scaling to any si

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