TONE can also be regarded as VALUE as both terms refer to the various degrees of lightness or darkness. At this point, the colour* (or hue) of the subject is unimportant.
Some terms which need to be understood
SHADE: A colour (hue) with black added. This is why using a (black) pencil on paper (the 'colour') for rendering is referred to as SHADING
TINT: A colour (hue) with white added
TONE: A colour (hue) with grey added
VALUE: The degree of lightness or darkness in colours. This is easier to see if the colours are translated into greyscale (see below) and is the reason why the terms TONE and VALUE are similar.
The element of value or tone is, in its simplest form, the juxtaposition of light and dark. It is defined as the intensity of lightness or darkness in anything that is visible. For more click here www.pomona.edu/Academics/courserelated/classprojects/Visual-lit/value/value.html
Value (or tone) refers to the various degrees of light and shadow. Values allow us to perceive the three-dimensionality of objects because values correspond to planes of form. More .......... www.udel.edu/artfoundations/drawing/value.html
http://art-wow.com/drawing/tonalValues.cfm Balancing the darks, medium grays and whites in a drawing is critical simply because this is the only way to capture the illusion of three-dimensions on a flat surface such as paper.
Value is the difference in tones of light and dark. Light tones are "high" in value, dark tones are "low" in value.Values create form, the shape of the image and a sense of volume or 3-dimensionality. The use of different kinds of lines and dots, alone or in groups, and cross-hatching can also create tonal values & texture.
http://homepages.tesco.net/~p.wilkinson/BlendShade.htm You can work with a basic palette of only 5 shades Note that the human eye can not easily distinguish more than 5-7 gray tones, and the differentiation is more difficult at the very light and very dark ends of a scale
This is probably the limit to the range of tones that can be used if viewers are going to be able to distinguish between each tone. When you look at both maps, you can see the great advantage colour has over tone.
www.graphicdesignbasics.com/article1042.html www.graphicdesignbasics.com/article1011.html Value is just another word for the lightness and darkness of an area. Value is how we perceive forms. If a room was pitch black we would become disoriented, as there would be no light falling on areas in order to give us visual clues to where we were or if other objects where in the room with us. Value gradation or contrast is also known as chiaroscuro.
Continuous Tone- Images and devices that produce smooth gradations without apparent steps in color or value such as photographs
High contrast/Low contrast, High key/Low key 4
*Colour has three characteristics: Hue - the quality which distinguishes one colour from another.This is another word for "colour" Tone (usually referred to as 'Value') - The quality of brightness, the lightness or darkness of a colour Chroma - the quality of saturation or intensity of a colour