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The same wavelength can induce different colours in different circumstances.

Any number of different wavelengths can induce the same colour.

Different wavelengths of light induce different perceptions of colour but the relationship between wavelength and colour is neither simple nor straightforward. Light has no colour itself, it is merely electromagnetic radiation.

Light striking the eye triggers a chain of neurochemical reactions that end in perceptions of colour. Unfortunately, this explanation is a distortion of reality and is so overly simple as to be wrong.Ĭolours do not exist in nature, colours exist solely within an observer’s head. In this article I shall map the minefield and suggest one safe route through it.Ĭolour Basics - We learned in school that all colours are formed from combinations of red, green, and blue. You need to know where you can walk, where you cannot, and where the path is uncertain. The problem is not you, the problem is that colour is astonishingly complex. Matching colour ought to be simple, according to the ads, yet it rarely seems to be. #1627: iPhone 14 lineup, Apple Watch SE/Series 8/Ultra, new AirPods Pro, iOS 16 and watchOS 9 released, Steve Jobs ArchiveĪ cynic might be tempted to say that there are two categories of photographer, those who admit they have problems matching colour, and liars.#1628: iPhone 14 impressions, Dark Sky end-of-life, tales from Rogue Amoeba.#1629: iOS 16.0.2, customizing the iOS 16 Lock Screen, iPhone wallet cases, meditate for free with Oak.#1630: Apple Books changes in iOS 16, simplified USB branding, recovering a lost Google Workspace account.

#1631: iOS 16.0.3 and watchOS 9.0.2, roller coasters trigger Crash Detection, Medications in iOS 16, watchOS 9 Low Power Mode.