How to create custom PDF compression filters in OS X
These compression routines are done by adjusting the embedded image quality of the PDF, so if you have a PDF with many large, high-resolution images in it then it will show a greater reduction in size than one with only a few, lower-quality images.
Как Уменьшить Размер PDF-файла без Потери Качества Изображения
PDF формат – распространенный формат для создания цифровых документов и коммерческих материалов, хорошего качества, начиная от профессиональных задач, заканчивая приглашением для мамы на Рождественский ужин.
A Better Way to Reduce File Size in Preview
After I spend a few hours arranging them all, I print the whole thing to PDF and send it off to Steve and my kids to see if they have any objections or would like to add in any different photos. Here’s where this year’s learning came in. The calendar when printed to PDF is over 200MB! Even with Apple’s new Mail Drop service that lets you email giant files that end up as links, that seemed just a tad overboard for my needs.
This is a great way to reduce the file size of a PDF. Especially when dealing with a huge pdf a customer wants to be downloaded from their website. Download speeds is quite a big issue, so reducing the file size by any amount is of great help!
The resulting PDF file is small enough (approx. 4MB). But the image quality is way below optimal. Images with fine details, font etc. are reduced too much, so that details are only poorly visible. This is due to how the default quartz filter optimise the images. The compression quality and ImageSizeMax are rather “comprehensive”. But it is an easy task to create some custom Quartz filters for a less intense compression. Just take the default Quarz filter definition file as a template.
It’s also a great PDF viewer with full support for macOS’s built-in Markup annotation features, but did you know that you can easily add effects to any PDF document opened in Preview?
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Digging a bit deeper into how this is configured, it turns out that the default Quartz Filters are saved in -System-Library-Filters. Knowing that just about everything inside of -System is now off-limits, I created a new folder in -Library called Filters and put some customised versions of the filters in there instead.
So while looking around to resolve this I found out that the reduce file size option could be configured by the file: -System-Library-Filters-Reduce File Size.qfilter.
How to Reduce PDF File Size on Mac with Preview
Just how much space you will save by using this file reduction filter varies greatly, depending on the content of the PDF, the original app that created and saved the PDF and if any filtering was applied to begin with, amongst a variety of other factors. For originating documents that are entirely text, like a resume or a Word document that’s been converted to a PDF without any sort of optimization, it can make a huge difference, and you may see a file sized from 1MB shrinking down to under 100k.
Die Komprimierungsrate und der Verkleinerungsfaktor lassen sich jedoch in der ColorSync Utility einstellen! Dazu geht man dort auf „Filter“, dupliziert den schreibgeschützten Filter „Reduce File Size“ und nimmt auf der Kopie die benötigten Einstellungen vor.
Function Builtin languages German, English, Italian, Spanish, French, Portuguese Number of customerprogrammable filter lines 19 Number of documentation data records 100 to be stored to memory Minimum data retention time of the data memorys 6 m