If you are a web developer on a wide-gamut display, use Safari for development rather than Chrome (until it treats CSS colors as sRGB). If you are on a wide-gamut display, you should instead use the native color profile and live with sRGB→Native rounding errors. This results in a slight loss of color accuracy in exchange for less clipping errors. If you are using a near-sRGB display, you can set its profile to be sRGB. My recommendation is to always keep color meters and development tools in sRGB. The development environment must perform proper color management and use the same standard color space, however. As long as a meter displays values in a standard color space (such as sRGB) and reports potential clipping issues, the meter should be accurate for most development purposes. Due to color conversion, a system-wide color meter is useless. Trying to use native values from these displays in an sRGB context will result in noticeably incorrect colors. In late 2015, Apple introduced iMacs using wider-gamut displays. While Apple displays in the 2012-2015 timeframe were close to sRGB, minor errors would still occur. Apple uses sRGB displays - hence, my display's native values are the same as sRGB. Note that even then, the data may not be accurate, as system image APIs may have performed a color conversion upon opening. In order to see the file's original data, you need open the file in an image editor and use its built-in color meter or eyedropper tool. You can use a color meter to approximate the file's original data, but there is no guarantee that one or more lossy color conversions haven't already occured. I can use a system-wide color meter to see an image file's RGB data. See WWDC 2012 Session 523: “Best Practices for Color Management”. Starting in Mountain Lion 10.8, NSDeviceRGBColorSpace is treated as sRGB. Cocoa's “Device RGB color space” corresponds to my monitor's color space. Safari 9 correctly treats CSS colors as sRGB and Chrome has an open issue to fix this. Historically, however, browsers haven't color-corrected CSS colors. Per the CSS Color Module standard, colors are specified in the sRGB color space. CSS colors correspond to my monitor's color space.įalse. While many web developers would say #ff0000 is red, it may be bright purple or green in a contrived space. A color needs both coordinates and a color space (such as “my monitor's space” or “sRGB”) to be identified. Let's start by listing common mistakes made by developers: A color can be identified by it's red, green, and blue values.įalse. This article provides details on how macOS color space conversion affects the values displayed in color meter utilities. Example 3 - Modern macOS: Image without profile.Example 2 - Lion (10.7): Image without profile, second display.Example 1 - Lion (10.7): Image without profile, main display.Mac Color Meters and Color Space Conversion
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