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Tuesday
Jan292013

Exporting multiple different sizes from Lightroom

[Update 17/2/2012: Modified the script slightly to fix a path capitalisation bug]

[Update 22/3/2013: Re-recorded the video to explain the process better]

I've been shooting a lot of model sessions lately and one of the things I always need to do after these sessions is put the processed pictures into my dropbox where the model can see them. These pictures are for a variety of different uses including Facebook, 500px, Google+, various modelling sites and, of course, print publication. 

These sites often have different size limits and requirements so I usually need to export versions with and without watermarks and at various different pixel dimensions. So it's always been a pain in Lightroom that I can only export images at one size. Here's what I export by default: 

  • full-size clean
  • full-size watermarked
  • 2000px watermarked
  • 1000px watermarked

That's 4 separate exports and of course I have a preset for each. It's not a *lot* of work but all those clicks bug me so I set about finding a way to export multiple different sized versions in one step. I tried a number of different approaches but the one I settled on was to write an application. Steady-on, it's not as scary as it sounds. My plan was to set up an export preset to save a full sized watermarked version then my application, called automatically from Lightroom, would take that full sized version as input and create 2 more smaller versions and save them in the same folder. The problem now, was writing the application. 

I'm on a Mac so I started looking at Automator and when that proved too limited I looked at Applescript and when that proved too hard to debug I did what any reasonable, right thinking person would do and started whining on Twitter. I have a background in programming so surely I could accomplish this apparently simple task but no, I'd wasted a whole day on this so finally I asked for help. And to my great joy a couple of people did try. I posted my broken Applescript on pastebin in a huff and the next morning John Day (@johneday on twitter) had completely rewritten and simplified it for me. Thank you so much John - you're a superstar. Here's the script he wrote for me:

on open of myFiles
	set newSizes to {1000, 2000}
	
	repeat with aFile in myFiles
		set filePath to aFile's POSIX path
		set bPath to (do shell script "dirname " & quoted form of filePath)
		tell application "System Events" to set fileName to aFile's name
		repeat with newSize in newSizes
			do shell script "sips " & quoted form of aFile's POSIX path & " -Z " & newSize & " --out " & quoted form of (bPath & "/" & rename(fileName, newSize) as text)
		end repeat
	end repeat
end open

on rename(fName, fSize)
	do shell script "sed 's/fullsize/" & fSize & "/' <<< " & quoted form of fName
end rename

If you'd like to use this yourself run "Applescript editor" on your mac, create a new script and paste the above code into the code window. Then from the file menu choose save and be sure to save this as an Application, not a script. There's a drop-down box in the save window that lets you choose to save as Application. Save it in a folder somewhere and that's it, you're done. You just wrote an application. Congratulations - you're a programmer now. :)

Finally create your Lightroom export preset to save a full sized version, watermarked or not as you prefer. Then look at the bottom of the export dialog. You can choose post-processing actions. One of those is "Open in other application..". Pick that and then just below you can choose which application to use. Simple. Set your new application as the post-processing action and you're done. If you want other sizes instead of my 1000px and 2000px versions you can just modify the numbers in the line near the top of the script where it says, "set newSizes to {1000, 2000}". Add as many sizes in there as you like, comma separated.

So this solution is not mine at all. This is all down to John Day. If you find this useful please follow John on twitter (@johneday) and check out his website at https://www.johneday.com/

This is obviously a mac only solution but writing something similar should be quite easy on Windows. SIP, the Scilab Image Processing toolkit, is pre-installed on the Mac but it's free and available for windows too. So is ImageMagick, which does similar stuff. All that's needed is a little code to wrap that up written in C#, Python or even a DOS batch file. Let me know if you do something like that and I'll be delighted to add links to it from here.

PW187 - Exporting multiple different sizes from Lightroom

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Reader Comments (6)

Great Post!!! I was looking for this too! One tip though; In your original export you have to rename your pictures so it has the slug 'fullsize' in it. Otherwise the script stops because it is looking for that slug in the original title.


on rename(fNaame, fSize)
do shell script "echo " & quoted form of fNaame & " | sed 's/fullsize/" & fSize & "/'"
end rename

February 3, 2013 | Unregistered CommenterBakkel

I was attempting to use this script and did not see it behaving the way you describe. instead it seems to resize the images to the 2000px. It does not seem to be doing the name change or the additional sizes.
I have however worked up a very easy to understand Automator script that simply duplicates the image and resizes it in sequence. I haven't attempted to use this with Lightroom export file handling but if you'd like to try it out for yourself, it will probably be easier for you to edit on your own because its just an automator application and not an applescript.
I'll try it in conjunction with Lightroom and let you know if this works better for me.

February 6, 2013 | Unregistered CommenterJeff

Hi there. I am a late bloomer to Lightroom. I loved your video and I too could use this scrip to send out a few diff files so thanks to you and #JohneDay for the code! I have a question though... I am BRAND new to LR and I dont have any of the preset that you spoke of... especially the full size jpg from which you mentioned in the tut.... i copied his code put it in... but dont have a preset to "attach" it to... or it is not working.. :( it rendered one file only, i imagine the orig one.... so my question is... how do i get that preset that you had? I think that is the missing piece for me to make it work.... a thousand thanks!

February 27, 2013 | Unregistered CommenterLee

Bakkel. Thank you for spotting that. Yes your exported picture needs to contain "fullsize" in the name otherwise the script won't work. I'll add that to the article.

March 22, 2013 | Registered CommenterJohn Arnold

Lee - thanks for your feedback. I realised after reading your comment that I'd not explained this very well if you were a newcomer to Lightroom so I've re-recorded the video and swapped in the new video above on this blog post. Hopefully you should find the new version much clearer as it steps you through exactly what you need to do to create the export preset for yourself. Please let me know if you continue to have any trouble. You're welcome to email me on photowalkthrough@gmail.com.

March 22, 2013 | Registered CommenterJohn Arnold

Fantastic! Thank you for this. I now use one script on behalf of a client who wants different sizes and another version of the script for myself for web images for different sites that require different sizes.

October 13, 2013 | Unregistered CommenterChris Suspect

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