Transcript Tone and Values

Product Design Sketching
Tones and Values
Tones and Values
While lines are essential to delineate
contour and shape, certain visual
qualities of surface and volume cannot
be fully described by lines alone.
Through a combination of lines and
tonal values, we create the tactile
sensation and appearance we call
texture.
Tones and Values
Tone is the shading of black to white
according to the amount of light falling on
various surfaces of objects.
Tones and Values
 Tonal rendering can
 imply a shift in the direction of a surface
 express an overlapping of forms
 accentuate shape and express the surface
contour of an object
 convey a sense of light and mass
 add volume to the drawing as a whole
 suggest texture, value, materials and stimulate
visual interest
Ways to Express Tones
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Tones can be expressed by
Pigment (color / darkness)
Lines (hatching / crosshatching)
Dots (stippling)
Scribbles
Dashes, etc.
hatching
crosshatchi
ng
stippling
scribbling
Ways to Create Values
Tonal values can be represented by
different
Grades
Spacing
Overlapping
Value Scale
To create corresponding tones for
expressing value relationships of objects
in a sketch, start with producing a stepped
series and a graduated value scale
Mapping of Values
 Mapping reduces the many tonal variations that
we see into a few.
 You may begin by sorting the range of tonal
values into 3 groups, i.e. light, medium and dark.
Within each group, the value may vary to
articulate the nature of the surfaces but the
overall mapping of the value should remain clear
 You may squint through half-closed eyes or view
a scene through tinted glass which reduces the
number of colors and simplifies the values you
see