PowerShell 是一种通用脚本语言,因此您可以使用它来完成各种任务。以下是一个将光波长转换为相应 RGB 颜色值的函数:
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| function Convert-WavelengthToRgb {
param ( [Parameter(Mandatory,ValueFromPipeline,ValueFromPipelineByPropertyName)] [ValidateRange(380,780)] [int] $Wavelength,
[double] $Gamma = 0.8,
[int] [ValidateRange(1,255)] $Intensity = 255,
[switch] $AdjustHumanSensitivity )
process { $factor = 0
$result = [PSCustomObject]@{ Wavelength = $Wavelength R = 0 G = 0 B = 0 }
switch($Wavelength) {
{ $_ -lt 420 } { $result.R = -($_ - 440) / 60 $result.B = 1 $factor = 0.3 + 0.7 * ($_ - 380) / 40 break }
{ $_ -lt 440 } { $result.R = -($_ - 440) / 60 $result.B = 1 $factor = 1 break }
{ $_ -lt 490 } { $result.G = ($_ - 440) / 50 $result.B = 1 $factor = 1 break }
{ $_ -lt 510 } { $result.B = -($_ - 510) / 20 $result.G = 1 $factor = 1 break }
{ $_ -lt 580 } { $result.R = ($_ - 510) / 70 $result.G = 1 $factor = 1 break }
{ $_ -lt 645 } { $result.G = -($_ - 645) / 65 $result.R = 1 $factor = 1 break } { $_ -le 700 } { $result.R = 1 $factor = 1 break }
{ $_ -le 780 } { $result.R = 1 $factor = 0.3 + 0.7 * (780 - $_) / 80 break } }
if ($AdjustHumanSensitivity.IsPresent -eq $false) { $factor = 1 }
$result.R = [Math]::Pow( ($result.R * $factor), $gamma) * $Intensity -as [int] $result.G = [Math]::Pow( ($result.G * $factor), $gamma) * $Intensity -as [int] $result.B = [Math]::Pow( ($result.B * $factor), $gamma) * $Intensity -as [int]
return $result } }
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现在,将整个可见光谱转换为相应的 RGB 值就变得简单了:
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380..780 | Convert-WavelengthToRgb | Out-GridView -Title 'Without Correction'
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由于人眼对不同颜色的敏感度不同,该函数甚至可以考虑此敏感度并自动应用校正:
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| 380..780 | Convert-WavelengthToRgb -AdjustHumanSensitivity | Out-GridView -Title 'With Correction'
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