<#

Source: https://github.com/jellyfin/jellyfin/issues/8103#issuecomment-2254132859

Instructions are below, then fill in the 3 variables below.
If you connect to your server without using a port number, remove :8096 from the $Jellyfin_Server variable.
 
$Jellyfin_Server: This is the hostname or IP address of your jellyfin server.
$Jellyfin_ApiKey: Create a new API Key for use in this script by going to the Dashboard > API Keys > New API Key button, enter any name, then copy the generated API Key.
$Jellyfin_UserId: This can be retrieved by going to the Dashboard > Users, then click on a user account you want to use with this script, then copy what is in the URL after "userId=" 

#>

##### VARIABLES #####
$Jellyfin_Server="HostNameOrIPAddress:8096"
$Jellyfin_ApiKey="APIKeyGoesHere"
$Jellyfin_UserId="UserIdGoesHere"


Write-Host "Please wait, the progress bar will appear soon."
$actors = (Invoke-RestMethod -Uri "http://${Jellyfin_Server}/emby/Persons?api_key=${Jellyfin_ApiKey}").Items | Where-Object { [string]::IsNullOrEmpty($_.ImageTags) } | Sort-Object -Property Id -Unique
$numberOfActors = $actors.Count
$count=0
Clear-Host
$actors | ForEach-Object {
	$percentComplete = $count / $numberOfActors * 100
	$roundedPercent = [math]::Round($percentComplete)
	Write-Progress -Activity "Downloading actors photos in progress" -Status "$count actors completed out of $numberOfActors. $roundedPercent% complete:" -PercentComplete $percentComplete
	$null = Invoke-RestMethod -Uri "http://${Jellyfin_Server}/Users/${Jellyfin_UserId}/Items/$($_.Id)?api_key=${Jellyfin_ApiKey}"
	$count++
}