File:CIExy1931_srgb_gamut.png
From Wikipedia, the free encyclopedia
CIExy1931_srgb_gamut.png (542 × 599 pixels, file size: 104 KB, MIME type: image/png)
This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
DescriptionCIExy1931 srgb gamut.png |
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 domainPublic domainfalsefalse |
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.Public domainPublic domainfalsefalse |
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. |
Items portrayed in this file
depicts
image/png
2d52889fb36283f9f1c86b8fc31cac5c8ccbf024
106,794 byte
599 pixel
542 pixel
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 09:37, 28 October 2009 | 542 × 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 |
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):
Global file usage
The following other wikis use this file:
- Usage on ar.wikipedia.org
- Usage on eo.wikipedia.org
- Usage on et.wikipedia.org
- Usage on fi.wikipedia.org
- Usage on fr.wikipedia.org
- Usage on fr.wikibooks.org
- Usage on hu.wikipedia.org
- Usage on it.wikipedia.org
- Usage on it.wikibooks.org
- Usage on ja.wikipedia.org
- Usage on ko.wikipedia.org
- Usage on pt.wikipedia.org
- Usage on sr.wikipedia.org
- Usage on zh.wikipedia.org
Retrieved from "https://en.wikipedia.org/wiki/File:CIExy1931_srgb_gamut.png"