Sitecore PowerShell Script: Change alt value of image items in Sitecore media library

Sitecore PowerShell Script to change media items alt tag with image description or display Name or item name

cls

#input

$mediaTemplateName = "Image"

$mediaParentPath = "master:/sitecore/media library/Project"

$counter = 1

$allMediaItems = Get-ChildItem -Path $MediaParentPath -Recurse

$filteredMediaItems = $allMediaItems | Where-Object { $_.Fields["Alt"].Value -eq "" -and [Sitecore.Data.Managers.TemplateManager]::GetTemplate($_).InheritsFrom("Image") }

foreach($MediaItem in $filteredMediaItems) {

       

        $altValue = $MediaItem.ImageDescription

        if($MediaItem.ImageDescription -eq "" -and $MediaItem.DisplayName -ne "")

        {

            $altValue = $MediaItem.DisplayName.Replace(".jpg", "").Replace(".JPG", "").Replace(".png", "").Replace(".PNG", "").Replace(".gif", "").Replace(".GIF", "")

        }

        elseif($MediaItem.ImageDescription -eq "" -and $MediaItem.Name -ne "")

        {

            $altValue = $MediaItem.Name

        }

        #Update Alt tag

        $MediaItem.Editing.BeginEdit()

        $MediaItem.Fields["Alt"].Value = $altValue

        $MediaItem.Editing.EndEdit()

        Write-Host $counter " -> " $altValue " -> " $MediaItem.ItemPath

        $counter = $counter + 1

}

Any suggestions or improvements are most welcome.