The soft white light that you probably have in your living room or bedroom has a color temperature of about 2700 – 3200 degrees Kelvin.
If you’ve been in the market for light bulbs for your home or for photographic purposes then you’ve probably run into the term “color temperature”.Ĭolor temperature explains the difference between two light bulbs that are both described as white but which emit obviously different colors.Ĭolor temperature is measured in Degrees Kelvin.
Īs our LEDs will be using the RGB color scheme we will be focused on additive color today. If you want to learn more about color theory Wikipedia has some excellent articles on additive color and subtractive color. The CMY or CMYK color schemes cannot produce white, they are usually used on media (such as paper) that is white so the total absence of color results in white. Many printers use the CMYK color scheme, the “K” stands for “key” and represents the key color which is black. If you have a color printer the color cartridges it uses are cyan, magenta and yellow. Subtractive colors are used on media that absorbs light, such as printed media. The most popular subtractive color scheme is Cyan, Magenta and Yellow or CMY. Some display LEDs have an additional pure white element to make the whites look better. For this reason displays that use the RGB scheme are usually built with a black background, thus the total absence of red green and blue results in black.Ĭombining red green and blue at equal intensity results in white. One color that can’t be created using the RGB additive color scheme is black. The RGB color scheme is the most popular additive color scheme, mixing Red, Blue and Green to create pretty well any color. As you might suspect the Subtractive color model works the opposite way, the primary colors are subtracted from one another to achieve the desired effect.Īdditive color is used by devices that emit light, such as our RGB LEDs and the video screen you’re probably reading this on now. There are two types of color mixing theory – Additive and Subtractive.Īdditive color models involve using primary colors that ADD together in order to produce the desired color. Modern color theory dates to the late 19th and early 20th century.
As a result much early work was subjective. Most of the initial work with color involved sensory experiences rather than actual attributes of the physical world. It was Newton who came up with the concept of the “color wheel”, a chart that describes the usage of “complementary colors” that is still in use today. Initial work on color theory was performed as early as the mid 1400’s and early work with the science of color was undertaken by such luminaries as Leonardo da Vinci and Isaac Newton. Color TheoryĬolor theory is the study of the mixing of colors to produce a specific visual effect. An Arduino can be used with either type or LED.īefore we get started on lighting up our projects with RGB LEDs let’s take a quick look at some color theory, this will help you understand how we can create a multitude of colors with just three primary ones. Standard RGB LEDs can be used as stand-alone devices while Intelligent RGB LEDs require a controller or microcontroller. There are many different varieties of RGB LEDs, today we will look at two different types: In addition to being able to emit their three primary colors RGB LEDs can be used to display virtually any color of the rainbow by fusing together combinations of their three colors. RGB or Red-Green-Blue LEDs are a fusion of three LEDs in a single package.
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