for this definition and many more.Graph produced using CHROMiX ColorThink 2.2 software. SRGB’s gamut is shown as the multicolor shape, Adobe RGB (1998)’s gamut is shown as the first outlined area surrounding sRGB, and ProPhoto RGB is the largest outlined area.Gamut is defined as the total range of color reproduced by a device-see Adobe’s Color Management Dictionary. Color spaces are actually 3D, but this view offers a good comparison between these three working spaces). Photoshop’s Edit>Color Settings area with the Color Management Policies outlined in Red.Ī comparison of the gamuts of three popular working spaces from one angle (displayed as a 2D map. (For more on this topic, go here and look for articles L4.3.) Screen shots of Photoshop’s Color Settings and Embedded Profile Mismatch dialog boxes can be found below. In Photoshop, thesecan be set under Edit>Color Settings. When using wide-gamut working space profiles, it is critical to keep the profilesembedded in your files when moving files from computer to computer, and it is alsoimportant to know how to properly open and save files that contain embedded profiles.In virtually all cases, you want to “Use the embedded profile” when presentedwith a dialog box that asks the question, and always set your imaging program towarn you when opening files with a different embedded profile. Photoshop’s Edit>Convert to Profile screen with sRGB chosen as the destination working space profile (circled in red). The solution to this problem is to open the file in a colormanagement-aware application like Adobe Photoshop, choose Edit>Convert toProfile, and then choose sRGB as the working space profile (be sure to then save it asa new file so that you retain the benefits of the larger color space profile). Because of this problem, a photo displayed on a web page that is in awide gamut space, such as Adobe RGB (1998), will usually look desaturated whenviewed in most browsers. This can be helpful whenworking with applications that are not “color management aware,” like most webbrowsers. If you need to convert to 8-bit color, save your 16-bit file first, and use “Edit>Convert to Profile” to convert to a working space with a smaller gamut, such as Adobe RGB (1998) or sRGB (sRGB has a considerably smaller gamut than Adobe RGB).Ĭonverting from a wide gamut working space to a smaller gamut working space canbe done easily in Photoshop using Edit>Convert to Profile. It is important to stay in 16-bit when editing files in the ProPhoto RGB space to reduce the chance of banding (stairstepping) in your images. Over the last few years, I’ve primarily used Adobe RGB(1998), which has a smaller gamut than ProPhoto RGB, but I’m now converting manyof my RAW digital camera files into the ProPhoto RGB working space when exportingthem as 16-bit PSD or TIFF files, and I’ve been satisfied with the results. However, if you export RAW files using a working space with a smaller gamut,such as sRGB, you cannot regain the additional colors that were lost by not startingwith a wider working space. If you convert aRAW file from a digital camera and embed a very wide working space profile likeProPhoto RGB, then you will have an insurance policy as new technologies are introduced. Thisis primarily important because, as better monitors and more advanced printers areintroduced, you are able to display and print more saturated colors. ProPhoto RGB is a color space with anextremely wide gamut, which means that it can hold a very wide range of color. Some of the most common working space profiles are sRGB, Adobe RGB (1998),ColorMatch RGB, and ProPhoto RGB. “Use the embedded profile,” selected in red, is the correct option to choose in this case. Photoshop’s warning dialog box came up because the embedded profile (sRGB) did not match the Working Space Profile (Adobe RGB (1998)). However, many users will choose sRGB, which can produce very good results. To capture a very wide range of colors, I recommend choosingProPhoto RGB or Adobe RGB (1998). When you scan film or a print, you will also have different working space profiles fromwhich to choose. If you shoot in RAW mode, the working space profile setting (usually sRGB or Adobe RGB )that you can often choose in your digital camera, has no real meaning until you export your file and choose a working space profile using RAW processing software. Working space profiles (or editing space profiles) aregenerally embedded inside files, such as TIFFs, PSDs, and JPEGs. One of the most common questions asked by photographers is, “Which working space profile should I choose when converting RAW files, when scanning, or whensetting up my digital camera?”
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