PowerShell Requires Chilkat v11.7.0+

Tile a Watermark Across a PDF Page

See more PDF Watermark Examples

Demonstrates a tiled watermark, which repeats the stamp over the whole page instead of placing it once. Tiling overrides position.align; tile.spacingX and spacingY set the gaps, and tile.stagger offsets alternate rows by half a tile so the pattern does not line up in columns. A faint tiled stamp carrying the name or address is the usual way to mark a document so that a leaked copy can be traced back, and zOrder back keeps it behind the text where it does not hinder reading. 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 long_report.pdf

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

$json = New-Object Chilkat.JsonObject
$json.UpdateString("type","text")

#  {date:FORMAT} is replaced per page when the watermark is added.  The other placeholders are
#  {page}, {pages} and {filename}; {{ gives a literal brace.
$json.UpdateString("text","jdoe@example.com  {date:yyyy-MM-dd}")
$json.UpdateString("id","trace")
$json.UpdateString("zOrder","back")
$json.UpdateNumber("font.size","14")
$json.UpdateNumber("opacity","0.15")
$json.UpdateNumber("rotation","30")

$json.UpdateBool("tile.enabled",$true)
$json.UpdateNumber("tile.spacingX","60")
$json.UpdateNumber("tile.spacingY","80")
$json.UpdateBool("tile.stagger",$true)

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

$("id: " + $jsonOut.StringOf("id") + " pages: " + $jsonOut.StringOf("pages"))

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

#  Sample output:

#  id: trace pages: 1-3