The Adobe RGB (1998) color space is an RGB color space developed by Adobe Systems, Inc. in 1998. It was designed to encompass most of the colors achievable on CMYK color printers, but by using RGBprimary colors on a device such as a computer display. The Adobe RGB (1998) color space encompasses roughly 50% of the visible colors specified by the CIELAB color space â improving upon the gamut of the sRGB color space, primarily in cyan-green hues.
The CIE 1931 xy chromaticity diagram showing the primaries of the Adobe RGB (1998) color space. The CIE Standard Illuminant D65 white point is shown in the center.
There is a very quick way to tell if your image is using the sRGB or AdobeRGB colour profile. Adobe RGB images start with an underscore, such as MG0543.jpg. Pictures captured in the sRGB color space start with the letter I, as in IMG0543.jpg. Pros and Cons AdobeRGB. As we mentioned before, AdobeRGB has a wider range of colours. SRGB or Adobe RGB. Yes, selecting Adobe RGB or ProPhoto RGB will give you a larger portion of the color spectrum to work with but essentially, sRGB is the one color space that is the most applicable across a multitude of platforms. I have personally used sRGB for the last five years, and many of the printers and monitors. Adobe RGB (1998) is a color space that was developed by Adobe Systems, Inc. In 1998 and designed to cover a larger range of colors than the more common sRGB color space. Many professional photographers prefer Adobe RGB to sRGB due to the superior color range. ProPhoto RGB is a newer color space that has a much wider gamut than Adobe RGB and is more in line with modern digital cameras. Adobe RGB 1998 features a wide gamut and compatibility with many.
Historical background[edit]
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. Since not many applications at the time had any ICC color management, most operating systems did not ship with useful profiles.
P3 Vs Adobe Rgb
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. 709. SMPTE 240M's gamut was wider than that of the sRGB color space, but not by much. However, with the release of Photoshop 5.0 nearing, Adobe made the decision to include the profile within the software.
Some of its features include full-blown IDE-level code completion, support for 23 different languages, support for multi-file projects, breakpoints and debugging support, theme support, file and symbol navigator, automatic indentation support, intelligent bracket matching, and more. Supports various languages.
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Although 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. The real values were much closer to sRGB's, which avid Photoshop consumers did not enjoy as a working environment. 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.
Adobe 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, yet all of the adjustments made CMYK conversion worse than before. 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.[1]
Specifications[edit]Reference viewing conditions[edit]
In Adobe RGB (1998), colors are specified as [R,G,B] triplets, where each of the R, G, and B components have values ranging between 0 and 1. When displayed on a monitor, the exact chromaticities of the reference white point [1,1,1], the reference black point [0,0,0], and the primaries ([1,0,0], [0,1,0], and [0,0,1]) are specified. To meet the color appearance requirements of the color space, the luminance of the monitor must be 160.00 cd/m2 at the white point, and 0.5557 cd/m2 at the black point, which implies a contrast ratio of 287.9. 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.[2] The ambient illumination level at the monitor faceplate when the monitor is turned off must be 32 lx.
As with sRGB, the RGB component values in Adobe RGB (1998) are not proportional to the luminances. Rather, a gamma of 2.2 is assumed, without the linear segment near zero that is present in sRGB. The precise gamma value is 563/256, or 2.19921875. In coverage of the CIE 1931 color space the Adobe RGB (1998) color space covers 52.1%.[3]
The chromaticities of the primary colors and the white point, both of which correspond to the CIE Standard Illuminant D65, are as follows:[2]
The corresponding absolute XYZtristimulus values for the reference display white and black points are as follows:[2]
Normalized XYZ tristimulus values can be obtained from absolute luminance XaYaZa tristimulus values as follows:[2]
where XKYKZK and XWYWZW are reference display black and white points in the table above.
The conversion between normalized XYZ to and from Adobe RGB tristimulus values can be done as follows:[2]
Srgb Vs Adobe Rgb Photography
ICC PCS color image encoding[edit]
An image in the ICC Profile Connection Space (PCS) is encoded in 24-bit Adobe RGB (1998) color image encoding. Through the application of the 3x3 matrix below (derived from the inversion of the color space chromaticity coordinates and a chromatic adaptation to CIE Standard Illuminant D50 using the Bradford transformation matrix), the input image's normalized XYZ tristimulus values are transformed into RGB tristimulus values. The component values would be clipped to the range [0, 1].[2]
The RGB tristimulus values are then converted to Adobe RGB R'G'B' component values through the use of the following component transfer functions:
The resulting component values would be then represented in floating point or integer encodings. If it is necessary to encode values from the PCS back to the input device space, the following matrix can be implemented:
Comparison to sRGB[edit]Gamut[edit]
A comparison of the Adobe RGB (1998) color space and sRGB color gamuts space within the CIE 1931 xy chromaticity diagram. The sRGB gamut is lacking in cyan-green hues.
sRGB is an RGB color space proposed by HP and Microsoft in 1996 to approximate the color gamut of the most common computer display devices. 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'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. Adobe RGB (1998) extends into richer cyans and greens than does sRGB â for all levels of luminance. The two gamuts are often compared in mid-tone values (~50% luminance), but clear differences are evident in shadows (~25% luminance) and highlights (~75% luminance) as well. In fact, Adobe RGB (1998) expands its advantages to areas of intense orange, yellow, and magenta regions.[4]
Although there is a significant difference between gamut ranges in the CIE xy chromaticity diagram, if the coordinates were to be transformed to fit on the CIE uâ²vâ² chromaticity diagram, which illustrates the eye's perceived variance in hue more closely, the difference in the green region is far less exaggerated. Also, although Adobe RGB (1998) can theoretically represent a wider gamut of colors, the color space requires special software and a complex workflow in order to utilize its full range. Otherwise, the produced colors would be squeezed into a smaller range (making them appear duller) in order to match sRGB's more widely used gamut.
Bit depth distribution[edit]
Although the Adobe RGB (1998) working space clearly provides more colors to utilize, another factor to consider when choosing between color spaces is how each space influences the distribution of the image's bit depth. Color spaces with larger gamuts 'stretch' the bits over a broader region of colors, whereas smaller gamuts concentrate these bits within a narrow region.
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A similar, yet not as dramatic concentration of bit depth occurs with Adobe RGB (1998) versus sRGB, except in three dimensions rather than one. The Adobe RGB (1998) color space occupies roughly 40% more volume than the sRGB color space, which concludes that one would only be exploiting 70% of the available bit depth if the colors in Adobe RGB (1998) are unnecessary.[4] On the contrary, one may have plenty of 'spare' bits if using a 16-bit image, thus negating any reduction due to the choice of working space.
See also[edit]References[edit]
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Adobe_RGB_color_space&oldid=914080686'
How frequently have you been to your camera settings to switch between Adobe RGB and sRGB color space? Are you even aware of what these terms mean, or what exactly is a color space? Even I was unaware of these technical terms until a few years back but I quickly realized their importance.
What is a color space?
A color space is a part of the color gamut, which is basically the universe of color tones. So you can assume different color spaces to be planets of different sizes. Out of many planets, Adobe RGB and sRGB are two most commonly used color spaces in photography.
Depending on your preferences, you can choose the desired color space and get the best possible result out of it.
By The original uploader was Cpesacreta at English Wikipedia [Attribution or CC BY 2.5], via Wikimedia Commons
What are Adobe RGB and sRGB color spaces?
Adobe RGB is a bigger color space than sRGB as it is comprised of many more variations of color tones. This is one of the reasons that Adobe RGB monitors are vastly used by photographers â they can display more colors as compared to an sRGB monitor.
![]() Monitors and printers
Adobe RGB monitors are used by a majority of modern day printer operators as well because they are capable of showing what a CMYK (cyan magenta yellow and key or black) printer color profile can produce. This helps the printer operator to ensure that colors that are being displayed on the Adobe RGB monitor shall be very close to the print that comes out of the CMYK color space printer (used for magazines and publications).
So being a photographer it makes sense that you use an Adobe RGB monitor so that you can edit your photos and see the actual colors that will come out in the prints.
Whereas, if you are sure that you will not get your photos printed in the near future then it does not make any sense to use an Adobe RGB monitor. If you only take photos for yourself or to upload them to the web, then an sRGB monitor is ideal for your purposes.
Camera shooting color space
But in order to view the actual colors of Adobe RGB or sRGB color space on your monitor, you need to capture the photo in that particular color space in the first place.
Unless you capture a photo in the required color space, be it Adobe RGB or sRGB, you cannot use that photo to its full potential. Shooting photos in the larger Adobe RGB color space allow you to capture more color tones, thus helping you see accurate colors on Adobe RGB monitors and in the prints. Whereas clicking in sRGB color space allows you to upload images to the web without any change in colors.
While shooting in one of these two color spaces each has their own advantages, there are few disadvantages as well.
Setting your camera color space.
Advantages and Disadvantages of shooting in Adobe RGBAdvantages:
Disadvantages:
Nikon Color Space Srgb Or Adobe Rgb
NOTE:You can convert an Adobe RGB color profile image into sRGB color space using software such as Photoshop and Lightroom.
Left: While exporting photos in Lightroom, you get the option to choose the color space. Right: In Photoshop, you can go to Color Settings and select the required option as your working color space.
Advantages and Disadvantages of shooting in sRGBAdvantages:
Disadvantages:
ConclusionAdobe RGB or sRGB, which color space to choose while shooting?
If you are a photographer who prints your photos often and you want to ensure that the colors are accurate in your prints, then you must shoot in Adobe RGB color space. Shooting photos in sRGB color space might give you a variation in colors that you see on your monitor and in the final prints. Also if you participate in online photography contests, it is safe to capture and edit photos in Adobe RGB color space.
Should I Use Srgb Or Adobe Rgb
But if you only capture photos to upload them on the web, then shooting in the sRGB color space is the ideal choice for you. If you upload Adobe RGB color space photos to the web, you will notice that colors get desaturated.
Colour Space Srgb Vs Adobe Rgb
Left: This is how your photo gets desaturated when you upload Adobe RGB color space photo to the web. Right: When you upload sRGB color space photos, you get correct colors as seen here.
Canon Color Space Srgb Vs Adobe Rgb
Nonetheless, to be on the safe side you can shoot photos in the Adobe RGB color space. If needed you can always use the file for prints, and if you wish to upload to the web then you can simply convert the color space using Adobe Photoshop or Lightroom.
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