File:CIExy1931 srgb gamut.png

CIExy1931_srgb_gamut.png(542 × 599 像素,檔案大小:104 KB,MIME 類型:image/png


摘要

描述
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.
日期 2006年五月6日 (原始上傳日期)
來源 Transferred from en.wikipedia to Commons by Aboalbiss.
作者 英文維基百科Hankwang

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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]]

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Public domain 此作品已由其作者,英文維基百科Hankwang,釋出至公有領域。此授權條款在全世界均適用。
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著作權狀態 繁體中文 (已轉換拼寫)

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目前2009年10月28日 (三) 09:37於 2009年10月28日 (三) 09:37 版本的縮圖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

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