Find a pixel’s color value in ColorSync Utility on Mac
Use the ColorSync Utility calculator to get the color values of a pixel on your screen.
In the ColorSync Utility app on your Mac, click Calculator in the toolbar of the ColorSync Utility window.
Click the magnifying glass , then move your pointer over an area on the screen that you want to examine. The color values of pixels are shown in the ColorSync Utility window as you move the pointer.
To stop examining pixels, click anywhere.