Continuação das minhas breves leituras sobre uma breve questão - O QUE É A COR?

"In a physical sense, there really is no such thing as color, just light waves of different wavelengths.

The human eye can distinguish among the wavelengths, so we see the world in color. Rays of light vibrate at different speeds. The sensation of color, which happens in our brains, is a result of our vision’s response to these different wavelengths. When taken together, the various rays our eyes can distinguish are called the visible spectrum. This fairly narrow range of colors includes red, orange, yellow, green, blue, blue-violet (which scientists call indigo), and violet.

The visible spectrum. The colors that the human eye can experience are expressed in (...) gradient graphic. Reds have the longest wavelengths, violets the shortest. Contained in a ray of light but invisible to the human eye are infrareds (below red in visible spectrum) and ultraviolets (above violet in the visible spectrum). In addition in visible spectrum, the eye perceives black and white. White contains all colors of the spectrum and is sometimes described as an achromatic color. Black is the absence of all color – no visible light reaches the eye. Alternatively, an exhaustive combination of multiple pigments can reflect so little light that the eye perceives black."

Apparent Colors

Color is derived from light, either natural or artificial.

With little light, little or no color is present.

With a lot of light comes lots of color. Strong light produces intense color.

Seeing in color

Our eyes have three types of color receptor cells, or cones: red, green, and blue. As a result, all incoming light is reduced to these three colors. All perceived colors are generated by mixture of these three colors. However, not every color can be seen by humans; those that can are therefore called the visible spectrum. People can distinguish approximately 10 milion colors; this visible spectrum is called the human color space. Not everyone’s color-sensing cells respond alike, so identification of a specific color is highly subjective."

Fonte: Marioka, A., Stone, T. and Admas, S.(2008), Color design workbook – a real-world guide to using color graphic design, Bevely, Rockport