Resize-Image.ps1

using namespace System.Drawing

Add-Type -AssemblyName System.Drawing

function Resize-Picture {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [string] $SourcePath,

        [Parameter(Mandatory)]
        [int] $Width,

        [Parameter(Mandatory)]
        [int] $Height,

        [Parameter(Mandatory)]
        [string] $DestinationPath
    )

    end {
        try {
            $DestinationPath = $PSCmdlet.GetUnresolvedProviderPathFromPSPath($DestinationPath)

            $source   = Get-Item $SourcePath -ErrorAction Stop
            $inStream = $source.OpenRead()

            $sourceImage = [Image]::FromStream($inStream)
            $newSize     = [Size]::new($Width, $Height)
            $destination = [Bitmap]::new($sourceImage, $newSize)
            $destination.Save($DestinationPath)
        }
        catch {
            $PSCmdlet.ThrowTerminatingError($_)
        }
        finally {
            $sourceImage, $inStream, $destination | ForEach-Object Dispose
        }
    }
}

What kind of images/pictures can this handle?
PNG, JPG, others?
Other limitations?

What kind of images/pictures can this handle? PNG, JPG, others? Other limitations?

@eabase supported formats are those you can see under Remarks in https://learn.microsoft.com/en-us/dotnet/api/system.drawing.image.fromfile?view=windowsdesktop-9.0

Ok, so what happens when you try to resize it?

Example-1:
You have a 100x100 and want to resize to 50x100.

• Does it just cut off the image or does it squeeze the pixels?

Example-2:
You have a 100x100 and want to resize to 200x100.

• Does it pad it with black pixels, or stretch it out? (Or something else?)

Ok, so what happens when you try to resize it?

Example-1: You have a 100x100 and want to resize to 50x100.

• Does it just cut off the image or does it squeeze the pixels?

Example-2: You have a 100x100 and want to resize to 200x100.

• Does it pad it with black pixels, or stretch it out? (Or something else?)

@eabase I have no idea 🤣 this was written 3 years ago, didn't put too much thought into it. You will have to test and see what happens.