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Adobe RGB (1998) extends into richer cyans and greens than does sRGB – for all levels of luminance. sRGB's color gamut encompasses just 35% of the visible colors specified by CIE, whereas Adobe RGB (1998) encompasses slightly more than 50% of all visible colors.
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Since sRGB serves as a "best guess" metric for how another person's monitor produces color, it has become the standard color space for displaying images on the Internet. SRGB is an RGB color space proposed by HP and Microsoft in 1996 to approximate the color gamut of the (then) most common computer display devices (CRTs). The sRGB gamut is lacking in cyan-green hues. Normalized XYZ tristimulus values can be obtained from absolute luminance X aY aZ a tristimulus values as follows: X = X a − X K X W − X K X W Y W Comparison to sRGB Gamut Ī comparison of the Adobe RGB (1998) color space and sRGB color gamuts space within the CIE 1931 xy chromaticity diagram. The corresponding absolute XYZ tristimulus values for the reference display white and black points are as follows: The chromaticities of the primary colors and the white point, both of which correspond to the CIE Standard Illuminant D65, are as follows: In coverage of the CIE 1931 color space the Adobe RGB (1998) color space covers 52.1%. Rather, a gamma of 2.2 is assumed, without the linear segment near zero that is present in sRGB. The ambient illumination level at the monitor faceplate when the monitor is turned off must be 32 lx.Īs with sRGB, the RGB component values in Adobe RGB (1998) are not proportional to the luminances. Moreover, the black point shall have the same chromaticity as the white point, yet with a luminance equal to 0.34731% of the white point luminance. To meet the color appearance requirements of the color space, the luminance of the monitor must be 160.00 cd/m 2 at the white point, and 0.5557 cd/m 2 at the black point, which implies a contrast ratio of 287.9. When displayed on a monitor, the exact chromaticities of the reference white point, the reference black point, and the primaries (,, and ) are specified. In Adobe RGB (1998), colors are specified as triplets, where each of the R, G, and B components have values ranging between 0 and 1. Specifications Reference viewing conditions ParameterĠ.5557 cd/m 2 (0.34731% of white point luminance)ģ2.00 cd/m 2 (20% of white point luminance) In the end, Adobe decided to keep the "incorrect" profile, but changed the name to Adobe RGB (1998) in order to avoid a trademark search or infringement.
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On the other hand red and blue primary are the same as in PAL and green is the same as in NTSC 1953.Īdobe tried numerous tactics to correct the profile, such as correcting the red primary and changing the white point to match that of the CIE Standard Illuminant D50 (though that will also change the primaries and is thus pointless), yet all of the adjustments made CMYK conversion worse than before. To make matters worse, an engineer had made an error when copying the red primary chromaticity coordinates, resulting in an even more inaccurate representation of the SMPTE standard. The real values were much closer to sRGB's, which avid Photoshop consumers did not enjoy as a working environment. However, with the release of Photoshop 5.0 nearing, Adobe made the decision to include the profile within the software.Īlthough users loved the wider range of reproducible colors, those familiar with the SMPTE 240M specifications contacted Adobe, informing the company that it had copied the values that described idealized primaries, not actual standard ones (in a special annex to the standard). SMPTE 240M's gamut is wider than that of the BT.709 gamut and the same as BT.470 NTSC (System B, G). 709 (but not in primaries: 240M also defined EOTF and thus was display referred, sRGB was created by connecting BT.470 PAL and SMPTE C). Lead developer of Photoshop, Thomas Knoll decided to build an ICC profile around specifications he found in the documentation for the SMPTE 240M standard, the precursor to Rec. Since not many applications at the time had any ICC color management, most operating systems did not ship with useful profiles. Beginning in 1997, Adobe Systems was looking into creating ICC profiles that its consumers could use in conjunction with Photoshop's new color management features.