Bulk image conversion in PowerShell
I used to converted large amounts of images from one format to another in Adobe® Photoshop®. Photoshop has an amazing set of tools to bulk convert images and apply different filters/actions on the images. It even offers a COM scripting engine for VBScript and JScript (and AppleScript).
Did you know that you can do it in PowerShell? Well, PowerShell doesn't offer all that Photoshop has, but for a task as image/bulk conversion, PowerShell definitely gives you what you need, fast and simple.
For a complete list of conversion-able formats see the ImageFormat Class.
Get all BMP files from the Windows directory, convert them to JPEG files and store them in the C:\Temp directory:
[void][reflection.assembly]::LoadWithPartialName("System.Windows.Forms")
$imgDir = "c:\temp"
get-childitem $env:windir -filter *.bmp | foreach {
$baseName = [System.IO.Path]::GetFileNameWithoutExtension($_.fullname)
$img = new-object system.drawing.bitmap $_.fullname
$img.save("$imgDir\$baseName.jpeg",[System.Drawing.Imaging.ImageFormat]::Jpeg)
}
# build a function to reuse in $profile
function Convert-Image{
param($image,$toFormat,$saveTo)
$baseName = [System.IO.Path]::GetFileNameWithoutExtension($image)
$img = new-object system.drawing.bitmap $image
$img.save("$saveTo\$baseName.$toFormat",$toFormat)
}
Convert-Image -image "C:\windows\Blue Lace 16.bmp" -toFormat gif -saveTo c:\temp
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3 comments:
Seems useful... will come back sometime!
Happy Blogging (and scripting)!
Hey pal,
Thanks for the snippet. it was helpful for me.
Here's a little more enhanced version.
function Convert-Image{
param($image = "", $toFormat="png", $saveTo = "", $removeOriginal=0)
$result = ""
# Check 1: File existance
if ($image -ne $null)
{
if ([System.IO.File]::Exists($image))
{
# Check 2: set default output path
if ($saveTo -eq $null -or $saveTo -eq "")
{
$saveTo = [System.IO.Path]::GetDirectoryName($image)
}
$baseName = [System.IO.Path]::GetFileNameWithoutExtension($image)
trap {"Error while reading the image! Image convertion aborted. Please try again."} $img = new-object system.drawing.bitmap $image
if($img -ne $null)
{
$img.save("$saveTo\$baseName.$toFormat",$toFormat)
if ($removeOriginal)
{
Del $image
}
$img.Dispose()
$result = "$image successfully converted to $toFormat format"
}
}
else
{
$result = "Image $image does not exist. Try again with a relevant image file"
}
}
else
{
$result = "The image name is null or empty. please provide a vaild image file to process. \n Usage : Convert-Image -Image -toformat -saveto "
}
write-output $result
}
# Convert-Image -image "C:\windows\Blue Lace 16.bmp" -toFormat gif -saveTo c:\temp -removeOriginal 1
Cool :)
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