In previous versions of macOS, the Quick Look feature lets you view photos and files without having to open them in an app. In macOS Mojave, Apple has also introduced some convenient new editing tools to Quick Look, allowing you to perform actions specific to the kind of file you're viewing. Let's take a look at how it all fits together.
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How Quick Look Works
For those unfamiliar with Quick Look, the feature can be used for items on the Desktop, in Finder windows, in emails, in messages, and other places. It supports numerous file types, including HTML, PDF, Plain text, RTF, iWork, MS Office, RAW, JPEGs, and QuickTime formats. To activate it, simply select one or more items, then press the Spacebar or force-click using your Mac's trackpad.
In the top left of the Quick Look window you'll find the Maximize button next to the Close button. (You can also manually enlarge the window by dragging the corners.) Open with [App] and Share buttons are located in the top-right corner of the Quick Look window, along with a Rotate Left button if you're working with images or video.
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As before, if you select multiple items, you'll see arrow buttons to navigate through them, as well as a Sheet View button to see the items in an index sheet view. If you opened a document such as a PDF, you'll see a column of thumbnails along the side of the window for quickly navigating through the pages.
What's New in Quick Look
New to Quick Look in Mojave is the ability to access Markup tools. Simply click the Markup button to reveal the toolset.
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Quick Look lets you draw on and annotate images or PDF documents using arrows, shapes, and text. You can also use Markup to quickly sign a document with your digital signature. Click Done, and your changes are automatically saved.
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If you're viewing a video file in Quick Look, you'll see a new Trim button that allows you to trim the clip without having to open QuickTime.
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Clicking the Trim button reveals the scrubbing and edit ribbon along the bottom of the clip. You can click anywhere in the ribbon to jump to another point in the video, and drag the edges of the yellow frame to trim the clip to the desired length.
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Again, simply click Done when you're finished and your changes are automatically saved.
Top Rated Comments
This was one of my favourite hidden feature in previous versions, until Apple took it away.
The new stacks are cool and u can scrub thru documents but not folders. I wish the scrubbing function would work for folders or at least show you an icon view of the folder's contents.
https://www.macrumors.com/2018/06/18/macos-quick-look-encrypted-data-bug/
Quicklook does works seamlessly for most filetypes as Apple delivers QL plugins for the most common filetypes. However, that doesn't mean that if Apple didn't deliver a QL plugin for a filetype that you're stuck -- because Apple also made it easy to add your own QL plugins.
Looks like a complete fail. Hence why I originally moaned about the lack of format support, as I likely checked it out previously, and gave up.The following web site gives pointers to QL plugins for a number of filetypes that Apple doesn't deliver -- In particular Quicklook Video which adds support for .asf, .avi, .flv, .mkv, .rm, .webm & .wmf
http://www.quicklookplugins.com/
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What gives? Instead of complaining that Apple hasn't covered your corner case, why not spend a few seconds looking for "quick look plugins"? Naaaah, too much effort...
The video one, titled "Quicklook Video", is actually useless, and is from ages ago, "Oct 2014":
https://www.quicklookplugins.com/2014/10/27/quicklook-video / https://github.com/Marginal/QLVideo
Says "allows macOS Finder to display thumbnails, static QuickLook previews, cover art and metadata for most types of video files."
So basically it doesn't PLAY any video, but instead shows still image shot(s) of a video. Thus making it pretty useless as a so-called video playback QT plugin! Read the comments underneath, with people thinking it would, only to find out it doesn't.
My limited understanding here, is that in the latest few versions of macOS, make it not possible to get most things to function in QT, as there are not the API hooks available anymore in order to do so, &/or things like Perian are not able to work either. Making the idea of most of these apparent QT plugins largely legacy only.
Please correct me if I'm wrong.