1. RGB vs. CMYK
Screen vs. Print

2. Why two modes?
Print and monitor uses two different ways of producing color
(CyanMagentaYellow blacK) When printing, ink is used to place an image on a page
(RedGreenBlue) Files for TV and video use light to project an image

3. RGB Mode Uses additive color theory
All colors must be combined to create white
RGB is brighter than CMYK on screen

4. RGB Mode Uses 3 (8-bit) channels
Pixels can produce 1 of 256 shades of R,G, & B
Three channels combines to produce 24-bit color
Can produce 16,777,216 colors (2 to the 24 power)

5. RGB Mode Not all colors in RGB can be reproduced using CMYK printing
When designing, work on images in RGB until all editing is complete.
Working is RGB mode is faster and there are more editing options

6. CMYK mode Uses subtractive color theory
No colors added to create white
Based on 4-color process printing
Uses 4 channels on screen CMYK
The 4th (black) channel does not increase number of colors
Black is used simply to create pure black on the printed page

7. CMYK mode Cyan Magenta Yellow normally produces black.
Inks have impurities which create a muddy brown color
CYMK has smaller gamut than RGB

8. RGB vs. CMYK
Additive colors Subtractive colors

9. Compare