Color Gamuts

A gamut is the range of colors that a color system can display or print. The spectrum of colors seen by the human eye is wider than the gamut available in any color model.

Among the color models used in Photoshop, L*a*b has the largest gamut, encompassing all colors in the RGB and CMYK gamuts. Typically, RGB gamuts contain the subset of these colors that can be viewed on a computer or television monitor (which emits red, green, and blue light). Therefore, some colors, such as pure cyan or pure yellow, can't be displayed accurately on a monitor.

CMYK gamuts are smaller, consisting only of colors that can be printed using process-color inks. When colors that cannot be printed are displayed on-screen, they are referred to as out-of-gamut colors--that is, outside a CMYK gamut.

Important: The gamut for an RGB or CMYK image depends on its document profile.

steps of how to solve the Gamut warning :

1.Open your image.

2. Press Shift + Ctrl + Y to access "Gamut Warning" or you can find it in "View >> Gamut Warning".

3. All pixels that fall outside of that particular profile’s gamut will be highlighted.

4. Choose " View > Proof Setup ", choose the proof profile you want to use. In this case, CMYK proof space is chosen by default.

5. Create a new Hue/ Saturation adjustment layer.

i. Drop down the option box to select the color you wish to adjust.

6. grey-highlighted part was disappear, it considered finish.

Click on the "Arrange Documents" icon on the application bar and choose " 2 Up" to compare the before and after.

Before and after Gamut Warning. Work done.

Special thanks to Ah Wei Ting. XD