根据波长转换为颜色

最新推荐文章于 2024-02-20 17:38:42 发布

FatherOfCodingMan

最新推荐文章于 2024-02-20 17:38:42 发布

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文章标签： javascript 前端 vue.js

原文链接：https://www.en.silicann.com/blog/post/wavelength-color/

版权

该博客介绍了一个将特定波长转换为RGB颜色的函数，涵盖了380到780纳米的可见光谱范围。通过一系列条件判断，函数将波长映射到红、绿、蓝三种颜色，并根据接近视觉感知极限时的强度调整颜色输出。此外，还涉及了在接近光谱极限时对颜色强度的调整，确保了颜色在人眼中的准确感知。

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//wavelength: 380 - 780
let wavelengthToRGB = function(wavelength) {
    let R = 0
    let G = 0
    let B = 0

    // core translation into color
    if (wavelength >= 380 && wavelength <= 440) {
        R = -1*(wavelength-440)/(440-380)
        G = 0
        B = 1
    } else 
    if (wavelength > 440 && wavelength <= 490) {
        R = 0
        G = (wavelength-440)/(490-440)
        B = 1
    } else 
    if (wavelength > 490 && wavelength <= 510) {
        R = 0
        G = 1
        B = -1*(wavelength-510)/(510-490)
    } else 
    if (wavelength > 510 && wavelength <= 580) {
        R = (wavelength-510)/(580-510)
        G = 1
        B = 0
    } else 
    if (wavelength > 580 && wavelength <= 645) {
        R = 1
        G = -1*(wavelength-645)/(645-580)
        B = 0
    } else 
    if (wavelength > 645 && wavelength <= 780) {
        R = 1
        G = 0
        B = 0
    }


    // intensity adjustment near the vision limits
    let intensity = 1
    if (wavelength >= 700) {
        intensity = 0.3 + 0.7*(780-wavelength)/(780-700)
    } else
    if (wavelength < 420) {
        intensity = 0.3 + 0.7*(wavelength-380)/(420-380)
    }
    console.log("intensity:", intensity)


    return [
        Math.round(R*intensity*255),
        Math.round(G*intensity*255),
        Math.round(B*intensity*255)
    ]
}