File:Linear visible spectrum.svg

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Summary

DescriptionLinear visible spectrum.svg	English: A linear representation of the visible light spectrum. Colour ranges were taken from 'CRC Handbook of Fundamental Spectroscopic Correlation Charts' (see w:Visible spectrum). Spectral XYZ locus coordinates were found here. Every 10nm, the spectral locus point was used as the initial point in a search for a matching sRGB colour (assuming "Dim" viewing condition). The search was carried out by a binary search along a line in CIECAM02 JCh space between the spectral point, and a point with 0.3 * brightness (J), 0 chroma (C), and the same hue (h) as the spectral point. The search finished when a point was found that was in sRGB space. The CAT02 matrix was modified as suggested in Brill(2008) to reduce yellow-blue problems by replacing the bottom row (0.0030, 0.0136, 0.9834) with (0,0,1). An iterative smoothing was carried out to eliminate the largest jumps in chroma (greater than 5% change). Code used to generate the colour gradient can be found here. Esperanto: Koloroj videblaj Nederlands: Kleurenspectrum 中文（简体）：软件模拟的可见光谱。中文（繁體）：軟體模擬的可見光譜。
Date	27 August 2008
Source	Own work
Author	Gringer
Other versions	Derivative works of this file: Linear Spectrum Marathi.svg Spectre visible lineaire en longueur d onde.png Linear visible spectrum sl.svg Inverse version of this image (linear by frequency in THz) Logarithmic version of this image (logarithmic by wavelength in nm) PNG version that this file was originally based on.

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File history

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	Date/Time	Dimensions	User	Comment
current	07:28, 26 September 2023	605 × 115 (11 KB)	Tyroxin	Fixed line of 450 nm touching the box
	13:19, 25 May 2021	605 × 115 (6 KB)	Gringer	Added back stop ids (these have semantic meaning) and minimal indentation
	08:22, 16 June 2020	605 × 115 (4 KB)	Jarvisa	Simplified SVG source
	05:28, 5 August 2010	605 × 115 (18 KB)	Gringer	10-step iterative chroma smoothing, slightly brighter grey point
	15:34, 4 August 2010	605 × 115 (18 KB)	Gringer	Smoothing applied to largest reduction in saturation (blue to cyan)
	14:40, 4 August 2010	605 × 115 (18 KB)	Gringer	Only using one adaptation matrix, finer resolution at blue clip point
	13:12, 3 August 2010	605 × 115 (18 KB)	Gringer	using Chroma-based cartesian coordinates for search
	12:44, 3 August 2010	605 × 115 (18 KB)	Gringer	Modified MH matrix slightly based on [http://www3.interscience.wiley.com/journal/112396194/abstract this]
	11:51, 3 August 2010	605 × 115 (18 KB)	Gringer	whoops, that was an older version
	11:43, 3 August 2010	605 × 115 (13 KB)	Gringer	slightly different MCAT02 matrix, different binary search algorithm
	16:06, 31 July 2010	605 × 115 (18 KB)	Gringer	using CIECAM02 model
	11:00, 29 July 2010	605 × 115 (18 KB)	Gringer	adjusting intensity between linear sRGB and non-linear sRGB, as gamma correction is encoded into that transform.
	08:51, 29 July 2010	605 × 115 (18 KB)	Gringer	Trying a gamma correction of 2.2 (e.g. x^(1/2.2)), rather than square root function
	11:35, 28 July 2010	605 × 115 (18 KB)	Gringer	generated RGB equivalent spectrum using sRGB matrix transform + spectrum->XY lookup tables.
	04:40, 17 November 2008	605 × 115 (13 KB)	Gringer	Added cyan band again, reduced luminosity to try to fit colour with Image:NASA_Hydrogen_spectrum.jpg.
	01:53, 31 August 2008	605 × 115 (13 KB)	Gringer	Updated using "Electric violet" colour @ 400nm, Luminosity reduced to remove Mach bands
	02:18, 30 August 2008	605 × 115 (13 KB)	Gringer	Attempt assuming monitor RGB are the same as monochromatic wavelengths from http://www.cis.rit.edu/mcsl/research/broadbent/CIE1931_RGB.xls, used wavelengths from there for transition points (except for violet, which was left at 422nm).
	11:59, 29 August 2008	605 × 115 (13 KB)	Gringer	Attempt using RGB colours from http://hyperphysics.phy-astr.gsu.edu/hbase/vision/cie.html#c4
	04:01, 29 August 2008	605 × 115 (13 KB)	Gringer	Added cyan point at 495nm, reduced luminosity of most colours in an attempt to remove w:Mach bands
	04:47, 28 August 2008	605 × 115 (13 KB)	Gringer	Changed violet RGB representation to "colour wheel violet"