File:CIExy1931 srgb gamut.png

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CIExy1931_srgb_gamut.png ‎(542 × 599 pixels, file size: 104 KB, MIME type: image/png)

Summary

Description
English: Based on: CIExy1931 As a replacement for an existing image with an unclear copyright status. The image highlights the sRGB gamut. The description of that image follows:
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.
Date 6 May 2006 (original upload date)
Source Transferred from en.wikipedia to Commons by Aboalbiss.
Author Hankwang at English Wikipedia

Licensing

Original upload log

The original description page was here. All following user names refer to en.wikipedia.
  • 2006-05-06 16:28 Hankwang 542×599× (106794 bytes) Based on [[image:CIExy1931.png|thumb|CIExy1931]]

Licensing

Public domain This work has been released into the public domain by its author, Hankwang at English Wikipedia. This applies worldwide.
In some countries this may not be legally possible; if so:
Hankwang grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.


This diagram image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with {{vector version available|new image name}}.


It is recommended to name the SVG file “CIExy1931 srgb gamut.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.

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image/png

checksum

2d52889fb36283f9f1c86b8fc31cac5c8ccbf024

determination method: SHA-1

data size

106,794 byte

height

599 pixel

width

542 pixel

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Date/TimeThumbnailDimensionsUserComment
current09:37, 28 October 2009Thumbnail for version as of 09:37, 28 October 2009542 × 599 (104 KB)Aboalbiss{{Information |Description={{en|Based on: thumb|none|CIExy1931 As a replacement for an existing image with an unclear copyright status. The image highlights the sRGB gamut.}} |Source=Transferred from [http://en.wikipedia.org

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