How to delete an image file based on its dimensions with PowerShell - windows

Question

I am trying to delete an image based on the dimensions of said image, but I've run into a problem.
I am trying to delete images whose length or width are less than 490 pixels. However, the code I have tried throws an error for every item. This is the error:
Remove-Item : Cannot remove item (file path): The process cannot access the file
'(file path)' because it is being used by another process.
At line:6 char:9
+ Remove-Item $_
+ ~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: ((file path):FileInfo) [Remove-Item], IOException
+ FullyQualifiedErrorId : RemoveFileSystemItemIOError,Microsoft.PowerShell.Commands.RemoveItemCommand
Here is my code:
[Void][Reflection.Assembly]::LoadWithPartialName("System.Drawing")
$(Get-ChildItem -Filter *.jpg).FullName | ForEach-Object {
$img = [Drawing.Image]::FromFile($_);
If (($img.Width -lt 490) -or ($img.Height -lt 490)) {
Remove-Item $_
}
}
I am not running any apparent processes that would be using the images. When using Handle64, it says that powershell.exe is using the files. Any help would be appreciated!

Answer 1

The $img object is keeping the file in use, so you need to dispose of that before you can delete the file:
Add-Type -AssemblyName System.Drawing
(Get-ChildItem -Filter '*.jpg' -File).FullName | ForEach-Object {
$img = [System.Drawing.Image]::FromFile($_)
$w = $img.Width
$h = $img.Height
# get rid of the Image object and release the lock on the file
$img.Dispose()
If (($w -lt 490) -or ($h -lt 490)) {
Remove-Item -Path $_
}
}