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I would like to take a group of 65K images and downsample it so that it is around 10K. Can someone tell me what I need to know to do this? I am not as concerned right now about each file being the same filesize, but if anyone has recommendations for that I am all ears. It seems like color profile settings get in the way of uniformity.

I tried the 'save for web & devices', but it doesn't seem to work. I try:

  1. add new action in actions panel / start recording on action
  2. change default colorspace to monitor spec
  3. save for web and devices - 800 height max, 50 - 100% quality
  4. hit save and choose destination
  5. batch- open images only with folder destination specified seems to override the default location

this only seems to work sometimes and i can't figure out why. i should also be able to use

EDIT: FWIW, I am on Mac ONLY.

Thanks for any help,


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up vote 1 down vote accepted

I haven't done any batch processing in Photoshop in a while, so I can't comment. What I want to share is that if for some reason you aren't able to do what you need via batch processing, Photoshop can also be scripted via AppleScript, VBScript, and Javascript.

Here's an article about Photoshop scripting. Here's Adobe's current documentation. If you need older docs, you'll need to google for them.

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Thanks very much for this info, Joe. I appreciate it. – jml Jan 2 '10 at 18:02

Does it have to be using photoshop? Irfanview has nice powerful batch processing capabilities.

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I know this isn't helpful (Why are you writing the answer then ?), but such things weren't, for a fact, available in older verions of photoshop (around 4). I don't know about the newer ones, but I usually gave up on photoshop, and started using Imagemagick tools for anything remotely similar. Install them once, you won't be using them too often, but every once in a while, something like this will pop up, and then, they'll be a lifesaver.

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Good to know, thanks. – jml Jan 2 '10 at 18:02

XnViewMP for MacOS X does batch convert.

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Thanks for all of these references. Very useful... But I'm not on Windows. :) – jml Jan 2 '10 at 18:03
Just out of curiosity, why wouldn't you recommend batch resizing in PS? Is it broken? – jml Jan 2 '10 at 18:04
XnView for Mac OS X: – Molly7244 Jan 2 '10 at 18:15
@Molly: Thanks - I've considerably shortened my answer now. – harrymc Jan 2 '10 at 18:35
@jml: didn't you say you have problems with PS? – harrymc Jan 2 '10 at 18:51

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