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The color periwinkle is also called lavender blue and light blue violet. The color periwinkle may be considered a pale tint of purple-blue in the Munsell color system, or a "pastel purple-blue". The color can represent serenity, calmness, winter, and ice.
Cyanopsia is a medical term for seeing everything tinted with blue. It is also referred to as blue vision. Cyanopsia often occurs for a few days, weeks, or months after removal of a cataract from the eye. Cyanopsia also sometimes occurs as a side effect of taking sildenafil, tadalafil, or vardenafil. [1]
In common English usage, purple is a range of hues of color occurring between red and blue. However, the meaning of the term purple is not well defined. There is confusion about the meaning of the terms purple and violet even among native speakers of English.
Tones of violet tending towards the blue are called indigo. Purple colors are colors that are various blends of violet or blue light with red light.
In optics, violet is a spectral color (referring to the color of different single wavelengths of light), whereas purple is the color of various combinations of red and blue (or violet) light, some of which humans perceive as similar to violet.
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The color lavender might be described as a medium purple, a pale bluish purple, [4] or a light pinkish-purple. The term lavender may be used in general to apply to a wide range of pale, light, or grayish-purples, but only on the blue side; lilac is pale purple on the pink side.
In order for all the colors to be spaced uniformly, it was found necessary to use a color wheel with five primary colors: red, yellow, green, blue, and purple. Munsell can only be displayed approximately on a computer screen, as these spectral colors have been adjusted to fit into the sRGB gamut.
Even among many modern speakers within the English-speaking world there is confusion about the terms purple and violet. The blue-dominated spectral color beyond blue is referred to as purple by many speakers in the United States, but this color is called violet by many speakers in the United Kingdom.
Deep purplish blue. B: Normalized to [0–255] (byte) Royal blue is a deep and vivid shade of blue. It is said to have been created by a consortium of mills in Rode, Somerset, which won a competition to make a robe for Queen Charlotte, consort of King George III.
The term blue generally describes colours perceived by humans observing light with a dominant wavelength between approximately 450 and 495 nanometres. Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green.