Thursday, February 5, 2009

Photoshop Tips: 9. CMYK vs. RGB: knowing which color space to use

The two basic color spaces, or Modes, that you'll most often encounter with your digital images are RGB and CMYK. Each has a specific use, outlined below.

RGB (Red-Green-Blue) is the color of the light emitted from your computer monitor, and from TV's. Use RGB if you are taking photos specifically to be viewed onscreen, such as the internet, or for a CD or emails. RGB usually also works well for printing from your home or office printer.

CMYK (Cyan, Magenta, Yellow, Black) is the color of inks used in the offset printing process. Use CMYK if you are sending your photo to be printed, such as preparing a postcard to be professionally printed for a gallery invite.

What color mode is your photo? In most cases, right off of your digital camera, the mode (or color space) will be RGB. You can tell in Photoshop by looking at the blue bar at the top of your open image (see the red arrow).

If you need to change the mode of your image, from the top toolbar click Image/Mode/CMYK.
Changing mode can affect the appearance of your image.
If you switch to CMYK from RGB, you may need to adjust your color. You may notice, as in this exaggerated sample, that the colors in the CMYK sample on the right have become somewhat subdued, especially in the blue range.



For a more thorough explanation of CMYK vs. RGB try this link:
http://www.printernational.org/rgb-versus-cmyk.php

2 comments:

  1. Thank you for all your posts about Photoshop. I got Elements for Christmas and am still learning about it all.
    I have been using Picassa, and Microsoft Paint to adjust images still because I haven't taken the time to learn Adobe. I really appreciate the easy to follow tutorials!

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  2. Hi Dana,
    Thanks for your nice comment! Keep me up on how the tips work for Elements; I am curious if my posts are helpful with that software.

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Thank you for your kind comments! They always make my day.