Blog image compress and standardizing script

compress_all.ps1

$TARGET_WIDTH = 1620

$widthDictionary = @{}
$maxWidth = 0

foreach ($f in Get-ChildItem -File *.jpg, *.png, *.bmp) {
    $info = magick identify -format "%w" "$($f.Name)"
    $width = $info -as [int]
    $widthDictionary[$f.Name] = $width
    Write-Output "Compare $($f.Name) size $width with $maxWidth"
    
    if ($width -gt $maxWidth) {
        $maxWidth = $width
    }
}

$scale = $TARGET_WIDTH / $maxWidth

Write-Output "Max width：$maxWidth, scale $scale x"

foreach($f in Get-ChildItem -File *.jpg, *.png, *.bmp) {
    $originName = $f.Name
    $targetName = $f.Name.Replace($f.Extension, ".webp")
    $targetWidth = $widthDictionary[$f.Name] * $scale -as [int]
    
    Write-Output "Process $originName scale to $targetWidth"
    
    magick "$originName" `
        -quality 50 `
        -define webp:lossless=false `
        -define webp:auto-filter=true `
        -define webp:image-hint=graph `
        -define webp:method=6 `
        -colorspace RGB `
        -resize $targetWidth `
        -gravity center `
        -background none `
        -extent $TARGET_WIDTH `
        -colorspace sRGB `
        "$targetName"
}