Converts PDF pages to PNGs with imagemagick.

pdf2png.ps1

# convert pdf to png
# requires imagemagick w/ ghostscript

param (
    [Parameter(Mandatory=$true,ValueFromPipeline=$true,Position=0)]
    [ValidateScript({[System.IO.Path]::GetExtension($_) -eq ".pdf"})]
    [string]$in,
    [string]$magick = "C:\utils\imagemagick\ImageMagick-7.1.1-Q16-HDRI\magick.exe"
)

process {

    $basePath = split-path $script:myinvocation.mycommand.path
    $file = new-object System.IO.FileInfo([System.IO.Path]::Combine($basePath, $in))
    $input = ('{0}' -f $file.FullName)

    $outdir = ('{0}\png' -f $file.DirectoryName)
    if (!(test-path $outdir)) {
        mkdir $outdir
    }
    $o = ('{0}\{1}.png' -f $outdir, 'page')

    $arguments = "convert -verbose -density 300 `"$input`" `"$o`""
    start-process $magick $arguments -wait -NoNewWindow

    # rename and renumber (from 1 instead of 0)
    $pages = get-childitem "$outdir\*-*.*" -include *.png

    foreach ($page in $pages) {
        $m = ([regex]"^(.+\-)(\d+)(\.png)$").matches($page.name)
        $title = $m.Groups[1].Value
        $num = $m.Groups[2].Value
        $ext = $m.Groups[3].Value
        
        $nextNum = 1 + $num
        $newName = $("{0}{1}" -f $nextNum, $ext)
        move-item $page "$outdir\$newName"

    }


}