Colorspace DeviceRGB Photoshop

Brief Description

Device RGB - the default color space for device contexts, consists of the arbitrary set of colors (Red, Green, Blue) for the specified output device. Logical color values in this space are given as three 8-bit color values (in a 32-bit value) and are sent to the device driver without transformation.

RGB colors are called additive colors because you create white by adding R, G, and B together—that is, all light is reflected back to the eye. Additive colors are used for lighting, television, and computer monitors. Your monitor, for example, creates color by emitting light through red, green, and blue phosphors.

What your issue is

(You are welcome to edit this)

In the case of DeviceRGB you have selected what is called an "Additive" color space and like a computer monitor it has a broad spectrum of valid colors. On the other hand the color printing process uses a "Subtractive" color space and it has a far more restrictive spectrum of valid colors. This means that your RGB colored items may very likely have colors that simply can not be reproduced by a printing press and therefore the final printed piece may not match very closely with what you see on screen.

How to fix this issue

(You are welcome to edit this)

By converting your images and other artwork elements into CMYK color space then you will be able preview the colors on your monitor more closely to how they will look when printed. This will prevent the situation where you order printed goods based on RGB and are not happy with the final product that you will receive in CMYK.

More details

You can edit an image in RGB mode in one window and view the same image in CMYK colors in another window. Choose Window > Arrange > New Window For (Filename) to open a second window. Select the Working CMYK option for Proof Setup, then choose the Proof Color command to turn on the CMYK preview in one of the windows.

Converting RGB to the CMYK:

If the file already exists select the following menu options: Image/Mode/CMYK When starting a new file select CMYK for the mode before clicking OK.

References:

Color Spaces

RGB

Converting RGB to the CMYK