PowerShell Requires Chilkat v11.7.0+

QR Code Colors and Transparent Background

See more QR Code Examples

Demonstrates colored QR codes. render.foreground is the color of the dark modules and render.background the color behind them, each as #RRGGBB. Either can instead be an object with a color and an opacity from 0 to 1, and a background opacity of 0 gives a PNG with a transparent background to place over a page or a design. Readers need contrast: keep the modules clearly darker than whatever ends up behind them. 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.

$fmt = New-Object Chilkat.Formats
$jsonOut = New-Object Chilkat.JsonObject

#  Dark blue modules on a pale yellow background.
$json = New-Object Chilkat.JsonObject
$json.UpdateString("payload.text","https://www.chilkatsoft.com/")
$json.UpdateInt("render.moduleSize",6)
$json.UpdateString("render.foreground","#1B3A6B")
$json.UpdateString("render.background","#FFF8DC")
$json.UpdateString("output.path","qa_output/qr_blue.png")
$json.UpdateBool("output.overwrite",$true)
$json.UpdateString("output.return","none")
$success = $fmt.QrCode("generate",$json,$jsonOut)
if ($success -eq $false) {
    $($fmt.LastErrorText)
    exit
}

$("colored: " + $jsonOut.StringOf("outputs[0].path") + ", " + $jsonOut.IntOf("outputs[0].byteCount") + " bytes")

#  The image written to qa_output/qr_blue.png:

#  

#  The same modules on a fully transparent background.
$json2 = New-Object Chilkat.JsonObject
$json2.UpdateString("payload.text","https://www.chilkatsoft.com/")
$json2.UpdateInt("render.moduleSize",6)
$json2.UpdateString("render.foreground","#1B3A6B")
$json2.UpdateString("render.background.color","#FFFFFF")
$json2.UpdateNumber("render.background.opacity","0")
$json2.UpdateString("output.path","qa_output/qr_transparent.png")
$json2.UpdateBool("output.overwrite",$true)
$json2.UpdateString("output.return","none")
$success = $fmt.QrCode("generate",$json2,$jsonOut)
if ($success -eq $false) {
    $($fmt.LastErrorText)
    exit
}

$("transparent: " + $jsonOut.StringOf("outputs[0].path") + ", " + $jsonOut.IntOf("outputs[0].byteCount") + " bytes")

#  qa_output/qr_transparent.png, placed here over a checkerboard and over a colored page
#  to show that whatever is behind the image shows through:

#  

#  Sample output:

#  colored: qa_output/qr_blue.png, 1345 bytes
#  transparent: qa_output/qr_transparent.png, 1377 bytes