File:CIExy1931 srgb gamut.png
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Size of this preview: 542 × 599 pixels. Other resolution: 217 × 240 pixels.
Original file (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
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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. |
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This diagram image could be re-created using vector graphics as a SVG file. This has several advantages; see Commons:Media for cleanup for more information. If a 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. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:37, 28 October 2009 | | 542 × 599 (104 KB) | wikimediacommons>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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