THE NATURE OF COLOR
Painting I
Stevenson
Color breaks down into three
parts:
1.
Value—the
lightness or darkness of a color; how close is it to black or white?
2.
Hue—the
title of a color: yellow, red, blue, brown, etc.
3.
Chroma—the
strength or intensity of a color; also called saturation.
So, if any one of these elements
changes from one color sample to another, then those two colors are technically
not the same. For instance, if the value and hue are the same, but the chroma
is slightly more or less, then the colors being compared are different. In the same way, two colors can actually be
closer in nature than they initially appear by having the hue and chroma similar
but the value much different.
Black and White
It is also important to note
that black and white hues
theoretically do not have chroma,
only value. Therefore they cannot be considered true
colors (even though we tend to refer to them as such). A color mixed with black is called a shade, color mixed with white is called
a tint, and color mixed with a
combination of black and white (achromatic
gray, explained below) is called a tone. The thing about black and white not
being true colors is that a tint or a shade of any color is a change to that
color’s value without changing that
color’s hue. It will also change the color’s intensity/chroma by diluting the pigment in the
paint, and therefore making it less chromatically
saturated or intense. The density of
a pigment suspension in oil paint is pretty much directly related to that
color’s intensity. Because of this, a
color is at its highest intensity straight out of the tube, so a color mixed
from two different pigments cannot be as chromatic as the pigments on their
own.
Chroma at Value
Another thing that you will come be aware of is that each hue reaches its highest intensity at a different
value. Yellow is at its highest
saturation at a very high key, whereas blue and violet are at their highest at
a very low value. Green, I think, is
surprisingly high, similar to orange, which are both a little higher than red
(though not much). Earth tones tend to
come from either broken prismatic (pure) colors or dark shades of high key
hues.
It is worth noting that as
shades of yellow darken—with more black added—the color that results looks
green, even though the hue is still technically yellow and hasn’t changed at all. As more black is added to orange—without
changing the hue—it gets brown.
Grays
There are basically two types
of grays: “achromatic” grays and “chromatic” grays. Achromatic grays are literally grays without
any color, that is, they don’t have hue and or intensity, only
value. They are grays made by mixing
black and white. Chromatic grays are, not
surprisingly, grays with color, or
grays that involve mixing complimentary colors (and possibly white and/or
black). The range of chromatic grays is
almost infinite, and a color is considered a chromatic gray as long it is at
least slightly broken, or mixed with
a compliment. You can have a gray that
is mixed with equal parts of red and green to make a very broken color that is
close to the center of the color wheel, or one made of very unequal parts closer
to the edge of the color wheel. For
instance, any blue that has even the slightest bit of orange in it is really a
chromatic gray, because it is at least slightly broken by the orange. It could still look extremely blue,
especially if it’s put up against a much more broken or contrasting color, but
it is a “gray” nonetheless. So, paintings
that look intensely colorful are often merely made up of chromatic grays.