I have to say that there is something important missing here. These filters compress very well some documents (as do the Quartz filters prepacked with Preview) and they compress other documents very badly. In fact, they expand these others hugely. In my experience, I have compression success about half the time with them. Your success may vary! I'd really like to have a more rule-based tool. As in, if you have this kind of a document/OS with these characteristics, these filters will work great. If on the other hand you have one with these characteristics, it won't. If we don't understand this rule, then it's sort of black magic that may or may not work. I like tools that I can count on.
One would like to believe that there is *something* about a pdf file that makes it appropriate or inappropriate for these filters. I do find it rather striking that when a compression filter doesn't work, it grossly expands a file. You'd think that if it didn't work, it just wouldn't do anything at all.
Do you confirm that you get a 4x bigger file (from non-compressed scanned PDFs, e.g. scans from OS X) after:
- exporting using to PDF using the "Reduce to 150 dpi average quality - STANDARD COMPRESSION" filter,
- then opening the resulting PDF file (not the original scanned PDF) and export it using the compressed PDF using the "JPEG compression - STANDARD" filter?
i reported an issue where these trashed all the color data on some of my professionally prepared pdf's. i don't know the technical details involved in what one would have to not downsample with these but despite the heroic effort on the OP's part (a big thank you) it is very weird that i cannot create pdf's on the mac without gargantuan size or custom scripting.
i cluttered up a whole 1 TB drive creating pdf's when i first ported to mac.
anyway, for those on a deadline to get something out across the internet - downloading the most recent version of acrobat as a demo version and simply saving as a reduced size pdf should do the trick for you...
I just want to Thank You for taking the time to thoroughly explaining how to reduce our scanned PDF File sizes and for providing us a link to the Quartz Filters.
I downloaded your Filter Folder and have a question I was hoping you could help me with. In your initial post you say:
Choose Save As in the File Menu (pretty easy I guess), then choose PDF as format, and one of the "Reduce to XXX dpi ..." Quartz filters, and click Save.
I have an issue halfway through that instruction. In "Preview" when I click "Save As" and then choose PDF as the format, the "Quartz Filter" comes up with eight options in the drop down menu, one of those options is "Reduce File Size". However, I do not have the option to "Reduce to XXX dpi...". The issue is that when I select "Reduce File Size" I believe it is reducing it to such a small dpi such that my PDF file is blurry/too small of a file. Can you please let me know what I am doing wrong or if you can help me at all?
I truly appreciate all your time and effort. Thank you!
FIrst, thanks for your nice words
"Reduce File Size" is the standard OS X filter.
You have probably not put the filters in the right location.
Here is the appropriate location, if your startup disk's name is "Macintosh HD". If it is different, just replace "Macintosh HD" with the name of your Startup disk.
If you are running Lion or Mountain Lion (OS X 10.7.x or10.8.x) then you should put the downloaded filters in "Macintosh HD/Library/PDF Services". This folder should already exist and contain files. Once you put the downloaded filters there, you should have for example one file with the following path:
"Macintosh HD/Library/PDF Services/Reduce to 150 dpi average quality - STANDARD COMPRESSION.qfilter"
If you are running an earlier vesion of OS X (10.6.x or earlier), then you should put the downloaded filters in "Macintosh HD/Library/Filters" and you should have for example one file with the following path:
"Macintosh HD/Library/Filters/Reduce to 150 dpi average quality - STANDARD COMPRESSION.qfilter"
Hope this helps and have a great day,
You are amazing! Thank you sooooo much for your prompt and very detailed response. I followed your advice and your filters work perfectly now! Again I truly appreciate all of your help and you have been so helpful throughout this whole thread for many others.
Have a wonderful start to your week!
I don't know how you do it but I always have problems with the quartz filters. I also find it quite a hassle to do the settings every time. Now my son introduced me to http://smallpdf.com - It gave me a 92% compression and I was happy. Maybe it's nothing for you more advanced folks but it worked nicely for me.
Let me know if you get the same compression rates...
smallpdf.com looks very simple (very clean interface !) and can be a great solution for some. Thanks!
2 remarks regarding your post though:
- What do you mean by "I also find it quite a hassle to do the settings every time" ? The purpose of these filters is not to have to manually edit settings every time you want to compress a PDF?
- smallpdf.com looks great. You should not be ashamed. And it would be much nicer and honest if you said in your various posts (this is your sicth post about smallpdf.com on Apple discussion) that you are the creator of smallpdf.com, don't you think :-) ??
This is especially true since you ask people to upload their personal files to your site and there is no "who we are" section on smallpdf.com. Moreover, since you appear as the site owner on whois pages or your facebook page, there is really no point in not saying it here.
I tried 2 files on smallpdf.com.
The first (a 1 page scan) was nicely compressed the appears that smallpdf.com compresses the image within the PDF to 200dpi and the result (70% reduction) was a tad bigger than with the "STANDARD" filter in this post (74% reduction)
The second (a 8.6MB, 63 pages PPT presentation exported to PDF from PPT2011) did not go through (I got the "Compressing PDF" wheel forever). This is one of the "problematic" PDFs that produced a larger output when exported with the filters discussed here.
I'd be glad to help you debug (via email, and since your email is on the smallpdf.com whois page, I should have no problem sending you one :-)
This discussion was created a few years ago, by the time of MobileMe.
MobileMe doesn't work anymore and so does the original link.
Here is a Dropbox link, which works: https://dl.dropboxusercontent.com/u/41548940/PDF%20compression%20filters%20%28Un zip%20and%20put%20in%20your%20Library%20folder%29.zip
Feel also free to re-distribute / re-post freely.
Thanks for the long reply!
And you are right, the filters for download are fantastic and solve probably most people's problems. Great how active you are on this! High respects! :-)
Well, when I told on another mac forum about the product to help someone solve a very simple compression, I was banned from the forum and I don't want to risk this here as well. Therefore, it seemed better to me not to be to direct here - sorry for deceiving
You have some great points and I would like to discuss it with you. Please send me an email. I would highly appreciate it.
Thanks again for the kind reply. :-)