Reducing file size of pdfs – Jerome Colas’ Standard Compression quartz filter

Apple’s Keynote has been very helpful for creating my image intensive lectures slides since it was unveiled in 2003. Each presentation I make is a large file which is fine as rarely leaves my desktop, but the pdf of the lecture slides are also large, which can be a problem for my students.

I do two things when creating lecture pdfs – first, I change the slide background (or theme) to white, to save on printer ink and speed when printing out slides. Then I reduce the file size of the pdf as much as possible to save students the grief of a lengthy download.

This used to be difficult, for with too much reduction, some images would get pixelated. I struggled with this until I discovered Jerome Colas’ quartz filters in 2007. Colas provided eight filters which he developed after experimentation, but I really only use his “Standard Compression” filter.

He tweaked that for a balance of image quality and file size and it is much better than Apple’s “reduce file size” filter.

His original public folders are offline now but you can download his standard compression filter here. For the entire set, try this).

Once downloaded, move the unzipped file to the Filters folder in Root > Library. If you cannot find the folder, simply create one – whiz is safe to do, no worries!

Filters location in OS X

When you are next viewing that large pdf, select “File > Export…”, and in the window that opens, select the standard compression filter in the Quartz Filter drop down menu.

Reducing pdf size using Jerome Colas Standard Compression FIlter

That often reduces a 90MB file to 9MB – yes, a 90% reduction is the norm! All my slide lecture pdfs are thus below 10MB. The pdfs look fine on screen and when I peek at my student’s printed notes, they look clear.

This filter is one of the first files I copy back onto my hardisk after a clean reinstall, and is working fine on Mountain Lion. It should be every educator’s arsenal – thanks Jerome!

For other apps I use, see macapps.sivasothi.com.

Adrian Loo called me when he was preparing the SIBiol newsletter on Pages and needed to reduce the newsletter size. So I decided to post this for a reference. Hope it helps.

About these ads

3 thoughts on “Reducing file size of pdfs – Jerome Colas’ Standard Compression quartz filter

  1. Dude, the step that I get confused with is transfer of the file into the library. Which library? In my frantic state today, I copied and pasted each of the individual files into PDF Services in the Library. Maybe you can make that part clearer? Anyway, super happy to install this once again – I thought it wouldn’t work on 10.8.2. Reduce file size just makes it too small for any use.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s