1. Product Design Sketching Chromatic Theories

2. Color Spectrum The range of colors seen by human eye is the “visible color spectrum”

3. Color Models RGB Model  Additive model (as that of light)  The 3 primary colors add up to form the white color CYMK Model  Subtractive model (as that of paint pigment)  Cyan, Yellow, Magenta and Black add up to become the black color

4. Basic Attributes of a Color A color can be denoted by its HSB value, i.e. the 3 attributes: Hue  Tint of the color  Location of the color in the color spectrum Saturation  Intensity or amount of color pigment Brightness / Lightness  Light value of the color  Intensity or amount of light

5. HSB Values You may use the colour picker of Adobe PhotoShop to identify the HSB values of your colour pencil Adjust hue and saturation Adjust brightness

6. Saturation vs. Brightness saturation brightness

7. Colour Physiology and Psychology Our perception of colour is governed not only by Physics but also by the biological structure of our eyes and the wiring of our brain

8. Colour Perception The color of an object being seen is determined by: Local color (of the object’s surface material) Ambient color (of the light source) Reflected color (from another object’s nearby)

9. Color Perception What we see is not ‘real’ but ‘perceived’

10. Colour Perception Dithering is a technique used in computer graphics to create the illusion of color depth with a limited color palette In a dithered image, colors not available in the palette are approximated by a diffusion of colored pixels from within the available palette. The human eye perceives the diffusion as a mixture of the colors within it.