1/ Use Memories in the Photos app in macOS Sierra — Apple revamped the Photos App in macOS Sierra, adding a Memories feature, which is designed to help you rediscover favourite and forgotten moments from deep in your photo library. Memories automatically creates curated collections of your most meaningful photos and videos.
To use it, open the Photos app and click Memories in the left sidebar. You’ll see a summary of the Memory’s contents, chosen from the best photos in your library. Choose Show All to see every photo and video in the Memory.
Scroll down to see the people included in the Memory, a map showing where the photos and videos were taken, and a list of related Memories for you to explore. At the bottom of your Memory, you can find options to add the Memory to your favorites or delete it.
2/ Save a Memory movie in macOS Sierra — Scroll to the bottom of the screen and tap or click Add to Favorite Memories. You’ll find it in the Favorite [sic] Memories album of your Photos app. If you decide that you don’t want to save a Memory anymore, tap or click Remove from Favorite Memories.
When you add a Memory to your Favorites [sic ditto], you preserve it and keep it from going away when Photos creates new Memories. You can also share your experiences with friends and family. On your Mac, you can share the photos and videos from your Memory when you click.
On your iPhone, iPad, or iPod touch, play a Memory movie, then tap on it to show the editing and sharing options. Tap and choose to share the movie through Messages, Mail, iCloud Photo Sharing, and your favourite social media sites.
3/ Directly paste Screenshots into Documents — First, hold down Command (⌘) + Shift + 4, to bring up the screenshot selection tool.
Next, hold down Control, and make your selection on the screen using your mouse.Click and drag diagonally, and when you let go, the screenshot is captured.
Open whatever document you want to paste the selection into, including email messages and web-page windows of sites you control, or Facebook, say, and press Command (⌘) + V or right-click/control-click and choose Paste from the pop-out Contextual Menu, or select Paste from the Edit menu, and the screenshot you captured is pasted right there.
4/ View photo metadata, called Exif, using Preview Inspector — Preview is a superb and deceptively simple app built into macOS that has multiple uses, like viewing PDFs, photos and more. Preview Inspector is one its powerful, hidden features that makes Preview so useful.
Short for Exchangeable image file format, Exif data contains important information about a photo. Location, camera model, color space, exposure and more are contained in each image. If you need to quickly look at this information, using Preview is the easiest way.
Find the image you want in Finder, then right-click (or hold down your Control key and click on it) and select Open With Preview fro the menu that pops out.
Next, in Preview, click on Tools > Show Inspector in the menubar (or press ⌘ + I on your keyboard).
In the next window that pops up, click on the Exif tab. You’ll then see all of the pertinent information about your image.
5/ View and grab GIF frames in Preview — Open the GIF image in Preview – if this doesn’t happen when you double-click a GIF file, drag-and-drop the GIF onto the Preview icon in the Dock, or use macOS’s Quick Look feature to open the image (click the GIF’s icon ONCE, then press the spacebar, then click ‘Open with Preview’ in the upper right of the Quick Look window.
In Preview’s sidebar, scroll to the frame you want to save. Control- or Right-click and select Export As.
You can then export it in the file formats JPEG, PNG or PDF.