The following applets are powered by CDF technology. CDF stands for Computable Document Format and was launched by the Wolfram Demonstrations Project. If you do not have CDF installed on your system, you can download it from here. Once you click the Applet's name, a new window will open. Disconsider all warning messages, if any, and click "Yes" or "Allow". Read how to use the Applets in the newly opened windows and follow the instructions. On the right side menu of each newly opened browser window you have the choice of downloading the code for free. The code needs "Mathematica" to be viewed and run on your computer. Mathematica is not free software! But CDF is free and can be used for running the codes in interpreter mode on computer. If your internet connection is too slow for running the applets online, download the codes, the CDF player and run the applets on your computer.
This App demonstrates the discovery made by Newton that light is composed of seven colors. When the wheel rotates very fast, the eye can't distinguish between individual stripes and is perceived as white.
|Newtons Color Wheel
by Enrique Zeleny
This code shows computer display of the color and RGB values of a particular wavelength of the visible spectrum. It is an application of both color and vision science and color display technology. The spectrum incorporates the falloff in sensitivity of vision toward the short and long wavelength limits. The appearance of the spectrum changes depending on the color space used because of the different primary colors and white point of each color space. Unless the display is fairly color accurate, the spectrum image may appear degraded by banding; on a color-accurate display, the gradation in the image is smooth.
|Colors of the Visible Spectrum
by Dan Dill
Blackbody radiation is the maximum amount of energy an object can emit. This Demonstration shows how Max Planck was able to close the gap between the explanation of classical physics and the observed experimental data. His formula was derived by assuming that oscillating molecules emit energy as quantized discrete values. His findings and Einstein's later discovery of photons led to the basis for quantum mechanics.
by Zach Heuman (Boise State University)
Planck's law gives the intensity of the energy radiated by a blackbody as a function of wavelength and temperature. As the temperature of a blackbody increases, the peak wavelength shifts from red to blue. Extremely hot blackbodies emit most of their energy in the ultraviolet range, while cool blackbodies emit primarily in the infrared. Stars behave like blackbodies, so their color follows their temperature, too. Stars similar to the sun (with a temperature of about 5800 Kelvin) appear nearly white because the visible part of the intensity curve is nearly flat.
by Jeff Bryant
The App shows the relationships that colors have with each other based on their relative positions on the color wheel.
by Jeremy Davis
This App shows the CIE Chromaticity Diagram. The CIE chromaticity diagram represents a CIE XYZ color space projection to xyY and its approximated RGB color gamut defined by a working color space. The gamut boundary is based on CIE Standard Colorimetric Observer Data. Two sets of colorimetric data, CIE 1931 2° and 1964 10° observer data, are provided, from 360 to 830 nm, sampled at 5 nm. Each working color space defines the coordinate values of primary and white point illuminants. These values are used to construct the conversion matrix from xyz to RGB and apply it in order to approximate RGB colors. The whole gamut represents all the colors that human eyes can perceive. The working color space defines the system gamut, which is usually much smaller.
|CIE Chromaticity Diagram
by Yu-Sung Chang
This demonstrates some of the lighting capabilities in Mathematica 6. There are three colored dots at the top of a back wall. Each one of them is a cone light and a point light. The user can move a slider to make a cone light sweep across the room. The point lights reflect on the top, side, and back walls. The graphic can be rotated to see the changes depending on the viewing angle.
by Jeff Bryant
In HTML 4.01, the language used for web browsers since 1999, there are 16 named colors: black, gray, silver, white, red, maroon, purple, fuchsia, green, lime, olive, yellow, gold, orange, blue, navy, teal, and aqua. Since 2004, more modern browsers have supported 140 named colors, which are shown in this Demonstration. The user can hover with the mouse arrow over a particular color to see its name.
by Ed Pegg Jr
Using this App, the user can select a color to find the nearest named RGBColors. The color specifications include colors supported by earlier versions of Mathematica, colors of atoms, websafe colors, other colors frequently used in HTML, and colors available on many Unix systems by inclusion of a file called rgb.txt by XFree86. Three segments of a circle show the nearest named legacy, HTML, and rgbtxt colors on a background which presents the selected color. The intensities for red, green and blue channels are shown as columns in panels. These intensities can be represented by real, integer or hex values. The user can select from all available colors or make selected colors websafe before searching a name.
|Nearest Named RGB Color
by Michael Schreiber
This Demonstration facilitates selecting, viewing, and comparing an assortment of colors from any of Mathematica's seven named color collections. It constructs a palette of up to 13 colors for use in Mathematica or elsewhere. A selected color may be displayed as a square region or as an equiangular segment of a disk with up to 12 segments displayed on the square background. The regions are numbered from 0 to 13, where region 0 is always the square background. Any region to be colored is first selected by clicking it and then clicking the dot representing a chosen color in the panel on the right; the panel is selected from a dropdown menu. Below the graphics each displayed region's number is printed, followed by the color's collection name, its index number within the collection, the color's name, and its RGB (red-green-blue) color values.
|Select View And Compare Named Colors
by Mark D. Normand
With this App the user can visualize the loci of colors in the HSV system (Hue, Saturation, Value) within the RGB color space (Red, Green, Blue), which is represented by a unit cube in Cartesian coordinates.
|HSV Loci In The RGB ColorSpace
by Saran Tunyasuvunakool
This Demonstration shows a three-dimensional representation of the visible colors in xyY space. The colors are mapped to various RGB working spaces. The x and y coordinates represent chromaticity (the difference between red, green, and blue), while the Y (vertical) coordinate represents brightness. Thus, the set of all possible points in xyY space represents all possible hues and brightnesses.
|CIE xyY ColorSpace
by Austin Ralls and Cody Silverman
This App lets user compose color in three color spaces: RGB, Hue and CMY. Three sliders control the color coordinates of the background. This color corresponds to the intersection of the three coordinate planes.
|Cartesian Color Coordinate Spaces
by Michael Schreiber
3D anaglyph images can be created from 3D graphics objects or plots. The module anaglyphview converts the graphics into a color anaglyph image. The resulting anaglyph image can be viewed with red-cyan glasses, creating a stereoscopic 3D effect. Red-cyan anaglyph glasses can be easily obtained from various internet retailers at a very low cost. The author recommends plastic anaglyph glasses (rather than paper) or plastic anaglyph clip-ons for people with reading glasses.
|3D Anaglyph Graphics
by Kay Herbert