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Basic Rendering Techniques Product Design Sketching Basic Attributes of Colour A colour can be denoted by its HSB value, i.e. the 3 attributes: Hue (its location in a colour spectrum) Saturation (the intensity of colour pigment) Brightness (the intensity of light) Saturation vs. Brightness

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basic rendering techniques

Basic Rendering Techniques

Product Design Sketching

basic attributes of colour
Basic Attributes of Colour
  • A colour can be denoted by its HSB value, i.e. the 3 attributes:
    • Hue (its location in a colour spectrum)
    • Saturation (the intensity of colour pigment)
    • Brightness (the intensity of light)
saturation vs brightness
Saturation vs. Brightness

brightness

saturation

hsb values
You may use the colour picker of Adobe PhotoShop to identify the HSB values of your colour pencilHSB Values

Adjust hue and saturation

Adjust brightness

creating different tones using dry media
Creating Different Tones Using Dry Media
  • Three ways to create tones:
  • By intensity of pigment / strokes
  • By using different degrees of colour saturation
  • By using colours of different colour temperatures (hues)
varying intensities
Greater stroke pressure represents shade

Medium pressure represents mid-tone

Lowest pressure represent highlight

Varying Intensities
varying saturations
Reduce the saturation either by

choosing a colour of a lower saturation value; or

Using grey / black colour as a blending agent

Varying Saturations
varying colour temperatures
Use a warmer hue (e.g. orange) than the midtone colour for highlights

Use a cooler hue (e.g. blue or purple) for shades

Varying Colour Temperatures
colour of an object
Colour of an Object
  • The color of an object being seen is determined by:
    • Local colour (of the object’s surface material)
    • Ambient colour (of the light source)
    • Reflected colour (from another object’s nearby)
light and shades
Light and Shades
  • Identify different light zones and then create tonal values:
  • Highlight
  • Middle tone
  • Shade
  • Backlight (for curved surface)
shades and shadows
Shade is the surface or area of a surface not facing the light source

Shadow is the area of a surface blocked by other objects or by other parts of the same object

Shades and Shadows
casting shadows
Casting Shadows
  • Use projection lines to simulate the light rays
  • Matching key points along the object’s contours on the surface on which the object is placed
  • Define the edge of the shadows
  • Render with a cooler colour
shading the cube

Shading the Cube

Product Design Sketching Activity