![]() ![]() Given A₄ = 440Hz, and by extension middle C = C₄ = 261.626Hz,we can try to take these electromagnetic frequencies, reinterpret them as soundfrequencies (making millions of scientists cringe in the process), and convertthem to musical notes. Young, the best we can get is the two spectra to the right,the left being the brightest and the right being the best compromise betweenbrightness and accuracy.īased off these spectra, it "appears" (to me at least) that red is around 610nm or 490THz, orange around 590nm or 510THz, yellow around 570nm or 525THz, green around 550nm or 545THz, cyan around 490nm or 610THz, and blue around 465nm or 645THz.Of the more difficult-to-place colors, magenta(or possibly rose?) appears somewhere around630nm or 475THz, aquamarine around 520nm or 575THz, indigo around 455nm or 660THz, and violet around 440nm or 680THz. It seemsthe only medium suitable to display monochromatic color is. Unfortunately, a computer monitor is poorly suited to display a spectrum.It would have to be as bright as the sun to even get close to adequate. If you're imaginingthings, at least.įirst of all, I'd like to see what the visible part of the electromagneticspectrum looks like, and try to locate "precisely" where pure red, green, etc.lie. Is it possible that the electromagnetic spectrum comes in octaves too,but we can only see one octave of it? If you take violet light and shift itcloser and closer to ultraviolet, it gets a little redder. What else does that sound like? Oh yeah, octaves inmusic. Notice that 800THz is twicethe frequency of 400THz. The visible light part of the electromagnetic spectrum runs from about800nm to 400nm, or 400THz to 800THz (using one significant figure, of course,which ought to make this entire endeavor invalid). While this color wheel does include the sum total of all colors I've talkedabout so far, it does have some weird properties: there are two sets ofsecondaries, making the complement of any primary or secondary color end upas a tertiary color.Īnd Now the "Interesting" (Read "Most Quackerish") Part The tertiary colors are scarlet, gold, chartreuse, the two greenswithout a name from the YIQ color wheel, azure, indigo, purple, and rose. If we wanted to keep red, green, and blue as primaries, this could be doneby promoting aquamarine to a secondary color, resulting in this color wheel.The primaries once again become red, green, and blue, but nowthere are two sets of secondaries, one being cyan, magenta, and yellow,with the other being a close approximation of traditional secondaries, orange, aquamarine,and violet. The primaries are magenta, orange, green, and blue, and the secondaries are red, yellow, cyan, and violet. The way the Apple II's video worked (what I called "Apple II VideoDisplay Theory") was the subject of a discussion on created the color wheel to the left during this discussion, based on myobservations. ![]() Therefore, what that high bit was doing wasdetermining which axis the color went along! If thehigh bit was set, the pixels would appear either orange or blue (or white).In the YIQ color system, the I axis runs from cyan to orange, and the Q axisruns from green to violet. If the high bit of thebyte in memory was cleared, the pixels represented by that byte would appeareither green or magenta (or white, if two consecutive bits were set). ![]() ![]() In high-resolution graphics mode, you could get four colors(other than black and white), which came in two groups. It's all pretty complicated and outside the scope of whatI even care about. The Apple II used some wacky properties of the NTSC color system to achieveits color graphics. ![]()
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