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September 1, 2022 19:08
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colors.ps1
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function Get-Rgb { | |
[cmdletbinding()] | |
param( | |
[string[]]$Color | |
) | |
# Clean up | |
if ($first = $Color[1]) { | |
$cleanedcolor = $Color -join "," | |
if ($first -notmatch "rgb" -and $first -notmatch "\(") { | |
$cleanedcolor = "rgb($cleanedcolor)" | |
} | |
} else { | |
$cleanedcolor = "$Color" | |
} | |
$cleanedcolor = $cleanedcolor.Replace('#','') | |
$cleanedcolor = $cleanedcolor.Replace(' ','') | |
if ($cleanedcolor -match '^rgb') { | |
try { | |
# If RGB --> store the red, green, blue values in separate variables | |
$rgb = $cleanedcolor -match '^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$' | |
if (-not $rgb) { | |
$rgb = $cleanedcolor -match '^([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])$' | |
} | |
$r = [convert]::ToInt32($matches[1]) | |
$g = [convert]::ToInt32($matches[2]) | |
$b = [convert]::ToInt32($matches[3]) | |
} catch { | |
Write-Warning "$cleanedcolor isnt a valid rgb color for the purposes of the script: $PSItem" | |
return | |
} | |
} else { | |
try { | |
$null = [int]::Parse($cleanedcolor,[System.Globalization.NumberStyles]::HexNumber) | |
if ($cleanedcolor.Length -eq 3) { | |
# if someone passed in a shortcut html, expand it | |
$cleanedcolor = $cleanedcolor[0] + $cleanedcolor[0] + $cleanedcolorex[1] + $cleanedcolor[1] + $cleanedcolor[2] + $cleanedcolor[2] | |
} | |
$r = $cleanedcolor.Remove(2, 4) | |
$g = $cleanedcolor.Remove(4, 2) | |
$g = $g.remove(0, 2) | |
$b = $cleanedcolor.Remove(0, 4) | |
$r = [convert]::ToInt32($r, 16) | |
$g = [convert]::ToInt32($g, 16) | |
$b = [convert]::ToInt32($b, 16) | |
} catch { | |
Write-Warning "$cleanedcolor is not a valid hex for the purposes of the script" | |
return | |
} | |
} | |
$r, $g, $b | |
} | |
function Get-Hsp { | |
[cmdletbinding()] | |
param( | |
[string]$Color | |
) | |
$r, $g, $b = Get-Rgb $Color | |
# HSP equation from http://alienryderflex.com/hsp.html | |
[math]::Sqrt( | |
0.299 * ($r * $r) + | |
0.587 * ($g * $g) + | |
0.114 * ($b * $b) | |
) | |
} | |
function Get-Contrast { | |
[cmdletbinding()] | |
param( | |
[string]$Color1, | |
[string]$Color2 | |
) | |
$one = Get-Hsp $Color1 | |
$two = Get-Hsp $Color2 | |
if ($one -ge $two) { | |
$first = $one | |
$second = $two | |
} else { | |
$first = $two | |
$second = $one | |
} | |
$first - $second | |
} | |
function Test-Contrast { | |
[cmdletbinding()] | |
param( | |
[string]$Color1, | |
[string]$Color2 | |
) | |
$diff = Get-Contrast $Color1 $Color2 | |
if ($diff -gt 50) { | |
$true | |
} else { | |
$false | |
} | |
} | |
function Test-DarkColor { | |
<# | |
.SYNOPSIS | |
Tests an rgb or hex value to see if it's considered light or dark | |
.PARAMETER Color | |
The color to test in Hex or RGB | |
.NOTES | |
Thanks to: | |
https://github.com/EvotecIT/PSSharedGoods/blob/master/Public/Converts/Convert-Color.ps1 | |
https://awik.io/determine-color-bright-dark-using-javascript/ | |
.EXAMPLE | |
Test-DarkColor ffffff | |
False | |
.EXAMPLE | |
Test-DarkColor 000000 | |
True | |
.EXAMPLE | |
Test-DarkColor "rgb(255,255,255)" | |
False | |
.EXAMPLE | |
Test-DarkColor "rgb(255,255,255)" | |
VERBOSE: 255 | |
VERBOSE: 255 | |
VERBOSE: 255 | |
VERBOSE: 255 | |
False | |
#> | |
[cmdletbinding()] | |
param( | |
[string[]]$Color | |
) | |
# Clean up | |
if ($first = $Color[1]) { | |
$cleanedcolor = $Color -join "," | |
if ($first -notmatch "rgb" -and $first -notmatch "\(") { | |
$cleanedcolor = "rgb($cleanedcolor)" | |
} | |
} else { | |
$cleanedcolor = "$Color" | |
} | |
$cleanedcolor = $cleanedcolor.Replace('#','') | |
$cleanedcolor = $cleanedcolor.Replace(' ','') | |
$r, $g, $b = Get-Rgb $cleanedcolor | |
$hsp = Get-Hsp $cleanedcolor | |
# Using the HSP value, determine whether the color is light or dark | |
if ($hsp -gt 127.5) { | |
$hsp | Write-Verbose | |
return $false | |
} else { | |
$hsp | Write-Verbose | |
return $true | |
} | |
} | |
function Get-InvertedColor { | |
[cmdletbinding()] | |
param( | |
[Alias("Color")] | |
$Hex | |
) | |
$hex = $hex -replace "#" | |
if ($hex.Length -eq 3) { | |
# if someone passed in a shortcut html, expand it | |
$hex = $hex[0] + $hex[0] + $hex[1] + $hex[1] + $hex[2] + $hex[2] | |
} | |
$rgb = "#" | |
for ($i = 0; $i -lt 3; $i++) { | |
$number = $i * 2 | |
$what = $hex.substring($number, 2) | |
$c = [convert]::ToInt32($what, 16) | |
$opposite = (255 - $c) | |
$c = '{0:X4}' -f $opposite | |
$rgb += ("00" + $c).SubString($c.length) | |
} | |
-join $rgb | |
} |
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