Mac "Preview" Compressed PDF Explained: The hidden artifacts that come with the system

Mac FlowerBefore the user buys a few pieces of compression software, please open the system's own "preview" (Prev) - it's built-inQuartzDigging filters can putPDFThe pressure was so strong that Mom didn't recognize it, and the whole process was local processing, zero cost, and zero upload. This article explained my gameplay once and for all.

Basic operation: three-step compression

Open with previewPDF → File Export...QuartzFilter "Reduce File Size」→ Save. That's it. Test it.68MBScan contract for, press to finish3.2MB Compression ratio95 % 。iPhoneShortcut "CompressionPDF "It is the same set of filters, the effect is the same.

Its fault: one size fits all, no gear

「Decrease file size"The problem is too violent: the image is pressed to a low quality,No image quality option. There is no problem with reading the document on the screen after pressing it, to print it, or if there are fine charts in it, it is exposed. That's probably the point of it being undervalued - it's not that it can't be played, it's just a way of playing.

Advanced gameplay: self-made decontamination gear

MacSecrets that users know: You can do this in the ColorSync Utility，in the application's→ old utility)CUSTOMIZE listQuartzFILTERS。Create a new filter, add the Image Compression and Resampling effects, and set the resolution to the value you want (e.g.150dpi ), it will appear in the filter box in the preview.

My Configuration: FiltersA 「Compression 150"for daily transfer reads, filtersB 「Compression 200”is used for the file to be printed. Configured once, the preview is optional, which is equivalent to having three compressions for free.

Matchmaking tips: Subtract before exporting

There are two other operations in the preview that can cooperate with compression: First, "each panel" directly deletes unwanted pages and exports them, and the number of pages is reduced and then reduced; second, the color of the scanned part is first "tool to→ adjust the color" to grayscale, and then the compression filter is applied to reduce the volume.

Applicable Boundaries

Preview compression pairPicture typePDFEffect extraction, yesWordsPDFEssentially invalid (font embedding is irrelevant). In addition, bookmarks and directories will be retained after export, but form edibility may be lost, and heavy interactivePDFDon't use it.

In a nutshell: Everyday needs, preview+Two homemade filters to coverMacUsers80%The compression scenario for.