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Powershell to convert image files to .pdf

Hello,  
Thanks for reading my post.  
Does anyone have example powershell script to convert image files to .pdf; example image format files are JPG, PNG, BMP, GIF, TIFF?  An example of the use case is employee expense reimbursement.  An employee digitizes their cash receipts; scenario A - captures an image of a cab ride receipt with his/her cell phone and scenario B - scans a hotel invoice with a mobile personal scanner.  The employee attaches two image format files to an e-mail requesting reimbursement.  The corporate accounts payable associate uses a workstation desktop image to pdf conversion utility to compile both images into a single .PDF file.   The single .PDF file is later uploaded into a Document Imaging Software.   A Business Process Management (BPM) product like BizTalk would call the powershell command as part of the business process automation routine.
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jrbledsoe001
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jrbledsoe001
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Joe Winograd, EE MVE 2015&2016DeveloperCommented:
Both GraphicsMagick and ImageMagick can do it. They are command line executables that can convert any image file type to PDF. Simply include a command line call to them in your PowerShell script or batch file or any scripting/programming language that can call a command line executable. For example, this EE article shows how to call GraphicsMagick from a batch file:
Reduce the file size of many JPG files in many folders via an automated, mass, batch compression method

That article also explains how to download/install it and discusses issues surrounding the various editions. Regards, Joe
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David Johnson, CD, MVPOwnerCommented:
powershell has no native commands to do this, you would have to call the program

GM ftp location for win32/win64 http://78.108.103.11/MIRROR/ftp/GraphicsMagick/windows/
code below doesn't work it call's gm but there is no output
$source_dir = read-host 'Source Location no backslash'
$destination_dir = read-host 'destination directory without backslash'
$files = Get-ChildItem -Path $source_dir -filter '*.jpg'
foreach($file in $files){
$destination_file = $destination_dir + '\' + $file.Name -replace '.jpg','.pdf'
#write-host ('{0}  {1}' -f $file.FullName,$destination_file) 
start-process -filepath 'C:\Program Files\GraphicsMagick-1.3.21-Q16\gm.exe' -ArgumentList "convert $file.FullName  $destination_file" -WindowStyle Hidden 
}

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Joe Winograd, EE MVE 2015&2016DeveloperCommented:
Here's an EE article I wrote that shows how to create a single PDF file from multiple image files using GraphicsMagick:

Create a PDF file with Contact Sheets (montage of thumbnails) for all JPG files in a folder and each of its subfolders using an automated, batch method

The core of the solution is one line of code:
gm.exe montage -compress JPEG -font Arial -pointsize %FilenameFontSize% -tile %ColumnsByRows% -frame 6 -shadow -label %%t -geometry %ThumbnailPixelSize% *.jpg %OutputFile%

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The article talks about JPG input files, but they can be other image file types. It uses some options that you may or may not care about, such as -frame, -shadow, -label, etc. And there are a ton of other options besides the ones in the article. Here's a link to its command line syntax where you may read about the multitude of options:
http://www.graphicsmagick.org/GraphicsMagick.html

Regards, Joe
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jrbledsoe001Author Commented:
Thank you for your comments - they are insightful and thought provoking.  The GraphicsMagick solution sounds like a great option when you have access to the server to install code or an executable.  In the day and age of Software as a Service (SaaS) and applications running on public cloud there are often limitations to calling external programs.  I do appreciate that you took the time to respond to my inquiry and provide code samples!
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Joe Winograd, EE MVE 2015&2016DeveloperCommented:
Are you saying that you want a public cloud-based solution?
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jrbledsoe001Author Commented:
Joe and David,  You both provided enough insight for me to move forward.  Thank you!!
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