What are RGB and CMYK? They are two ways of representing or producing color. RGB (Red,Green,Blue) was developed to represent color made by mixing different color light together. CMYK (Cyan,Magenta,Yellow,Black) is used to represent color made by mixing pigments together.
Color is color, why do I care how it is handled in our images? Well color isn’t just color, RGB and CMYK were developed for different uses. RGB is used in electronic displays like computers and smartphones, and CMYK is used in print. Because RGB was design for computers and CMYK was not, RGB will look better on your users’ screen
How do I tell what kind of color my images use? On a Mac, select the image file and press Command-i. This will open the file info window. The color space is listed under More Info. If you are using Windows, there is no one simple solution. Most photo editing software will have a way to check what color space the image is using and will let you change the color space. You should check your software's instructions, each program is different.
How do I change my images to RGB? If you are using a Mac, open the image in Preview and select Tool-Assign Profile. Choose an RGB profile and click okay. Finally save your image. If you are using Windows, Microsoft Publisher, Adobe Photoshop, Adobe Illustrator, or other photo editing software can be used to switch between CMYK and RGB. Check the Help section on your software for instructions on how to change an image to RGB.