Colors on a monitor are displayed using combinations of red, green and blue light called RGB. Some RGB and CMYK are gamuts are alike. Each model of monitor and printer is different, and so the displays also differ. For Example, one brand of monitor may produce brighter blues than another. The color space for device is defined by the gamut itself.

The four ink colors - Cyan, Magenta, Yellow and Black called CMYK combination is used for printing colors. These four inks are called process colors because they are the standard inks used in the four-color printing process. RGB and CMYK color models use different methods to display colors; they reproduce a different gamut i.e. different range of colors. RGB uses light to produce color; its gamut includes neon colors. In CMYK, printing inks are excellent at reproducing certain colors that lie outside the RGB gamut.

Photoshop allows us to define the color space on RGB images separately from the RGB color space of the monitor that displays them, because a monitor can display only a subset of all possible RGB colors. CMYK printing presses can reproduce certain colors that RGB monitors cannot. This is done by editing images using a larger RGB color space.

Click on File menu.

Click on Color Settings sub menu item.

Now click on RGB Setup menu item.

Now the RGB Setup dialog box appears on the screen. Select Display Using Monitor Compensation to display images using the monitor's RGB color space. This option uses monitor profile to display the image at maximum color accuracy.

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