RGB is the color model used for light-based devices like computer monitors while CMYK is used for printed materials. RGB uses additive color by combining red, green, and blue light, while CMYK uses subtractive color by combining cyan, magenta, yellow, and black pigments. Hexadecimal codes are used to represent the intensity of each RGB color value from 00 to FF. Common color spaces include RGB, CMYK, and Pantone which uses proprietary spot colors. Understanding color theory involves concepts like hue, saturation and color psychology. Accessible color use ensures sufficient contrast between colors.

1. Understanding ColorJust a beginning! By Beth Rajan Sockman

2. Additive & Subtractive Two colors most often used: RGB = Additive Color Add light get a LIGHTER image CYMK = Subtractive Color More pigment added, the DARKER the image

3. Color Spaces Click on image to link to movie about color space

4. Working with 3 Color Spaces RGB – Red, Green, Blue Monitor Light based devices (NOT SUNLIGHT!) CMY(K) – Cyan, Magenta, Yellow & Black Print Combine Pigments Pantone

5. RGB Used on computer monitors, digital cameras, televisions, mobile devices & other light-based devices Most PC allow 256 colors 216 colors match on Mac® & Windows®  web-safe colors 100% Red + 100% Green + 100% Blue = White

6. RGB - Hexadecimal Remember this website: http://html-color-codes.com/ Color codes are not in our number system which is the Decimal System or base 10. No, the numbers needed for any color code are written as Hexadecimals or base 16

7. RGB - Hexadecimal Decimal System: 0 to 9 as in: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 Hexadecimal Number System uses 16 different digits before digits are combined: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F

8. RGB - Hexadecimal Once you go past "F", you combine the digits as in 10, 11, 12, etc. Here is the direct comparison between the two systems: Decimal : 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 Hexadecimal: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 12

9. RGB - Hexadecimal Intensity of each of the colors RED, GREEN and BLUE in a color code ranges from 0 to 255 (= a range of 256 numbers). 0 is OFF meaning it contains no amount of the color 255 is FULL ON meaning full intensity of the color. Since the code for each of the three colors must be given as a Hexadecimal Code, the intensity for each color ranges from 0 to FF (Hex FF = Dec 255).

10. RGB What is the Hex Code for White? What is the Hex Code for Black? FF, FF, FF OO, OO, OO

11. CMYK CMYK color system is used for printed illustrations. It uses pigments as opposed to light. NOTICE the relationship between RGB & CMYK B G R

12. Pantone Propriety colors Pigments were developed in 1950’s Include metallic and various hues SPOT COLOR NO Mixing What you select is what you get!

13. Hue & Saturation Hue Each individual color on the color wheel Saturation Intensity of color from gray tone to the pure color.

14. Theory Accessibility – 8% of web audience will have color discrimination challenges Make colors contrast! http://www.lighthouse.org/accessibility/design/accessible-print-design/effective-color-contrast Color Psychology – Colors evoke emotions POWER Impulsive Impatience Sexual Joy Intelligence Organization Hard to see! Tranquility Patience Understanding Cooperation Hope Growth Good Health Freshness

15. Review What model of color is used for light based devices? What do the hexadecimal numbers designate? (T/F) CMYK is in the same color space as RGB. (T/F) Pantone is a type of CMYK color. Is RED a Hue or Saturation? RGB Amount of RGB FALSE FALSE HUE

16. References http://www.designworksoregon.com/pages/web_design_colors.html http://www.web-colors-explained.com/intro_web_colors.php http://evolt.org/Understanding_Color_and_Accessibility http://www.htmltutorials.ca/lesson9c.htm http://www.lighthouse.org/accessibility/design/accessible-print-design/effective-color-contrast http://iit.bloomu.edu/vthc/design/hue.htm http://www.youtube.com/watch?v=x0-qoXOCOow&feature=player_embedded