PowerShell Requires Chilkat v11.7.0+

Audit a PDF First, Optimize Only If It Is Worth It

See more PDF Optimization Examples

Demonstrates deciding whether to rewrite a PDF at all. "audit" costs a fraction of a second and changes nothing, so a batch job can audit every file and optimize only those where enough would be saved. Here the threshold is a tenth of the file; a file already as small as it can be is left alone. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  The PDF used in this example is available at watersense_accomplishments.pdf

$pdf = New-Object Chilkat.Pdf
$success = $pdf.LoadFile("qa_data/pdf/watersense_accomplishments.pdf")
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

$json = New-Object Chilkat.JsonObject
$jsonOut = New-Object Chilkat.JsonObject
$success = $pdf.Optimize("audit",$json,$jsonOut)
if ($success -eq $false) {
    $($pdf.LastErrorText)
    exit
}

$fileSize = $jsonOut.IntOf("fileSize")
$estimated = $jsonOut.IntOf("estimatedSavings.total")
$("fileSize:  " + $fileSize)
$("estimated: " + $estimated)

#  Only bother when at least a tenth of the file would go.
if ($estimated -gt ($fileSize / 10)) {
    $("Worth optimizing.")
    $success = $pdf.Optimize("optimize",$json,$jsonOut)
    if ($success -eq $false) {
        $($pdf.LastErrorText)
        exit
    }

    $success = $pdf.WriteFile("qa_output/watersense_optimized.pdf")
    if ($success -eq $false) {
        $($pdf.LastErrorText)
        exit
    }

    $("bytesSaved: " + $jsonOut.IntOf("bytesSaved"))
}
else {
    $("Already small enough; left as it is.")
}