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Using 4K displays, 5K displays, and Ultra HD TVs with your Mac
Learn about Mac support for 4K displays, 5K displays, and Ultra HD TVs. Also learn about the system requirements and how to set up and adjust the display or TV.

You can use 4K displays and Ultra HD TVs with these Mac computers:

MacBook Pro (Retina, Late 2013) and later
Mac Pro (Late 2013)
iMac (27-inch, Late 2013) and later
Mac mini (Late 2014)
MacBook Air (Early 2015) and later

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.	40755	0/0
./Payloads	40755	0/0
./Payloads/External	40755	0/0
./Payloads/External/System	40755	0/0
./Payloads/External/System/Library	40755	0/0
./Payloads/External/System/Library/CoreServices	40755	0/0
./Payloads/External/System/Library/CoreServices/FirmwareUpdates	40755	0/0
./Payloads/External/System/Library/CoreServices/FirmwareUpdates/Packages	40755	0/0
./Payloads/External/System/Library/CoreServices/FirmwareUpdates/Packages/MultiUpdater	40755	0/0
./Payloads/External/System/Library/CoreServices/FirmwareUpdates/Packages/MultiUpdater/MultiUpdater.efi.j137ap.im4m	100644	0/0	2875	3309132295

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Use an external graphics processor with your Mac
Your Thunderbolt 3-equipped Mac running macOS High Sierra 10.13.4 or later can access additional graphics performance by connecting to an external graphics processor (also known as an eGPU).
An eGPU can give your Mac additional graphics performance for professional apps, 3D gaming, VR content creation, and more.
eGPUs are supported by any Thunderbolt 3-equipped Mac1 running macOS High Sierra 10.13.4 or later. Learn how to update the software on your Mac.
Using menu bar item to disconnect eGPU
An eGPU lets you do all this on your Mac:

Accelerate apps that use Metal, OpenGL, and OpenCL
Connect additional external monitors and displays
Use virtual reality headsets plugged into the eGPU

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$sw_vers
ProductName:	Mac OS X
ProductVersion:	10.13.4
BuildVersion:	17E199

$ softwareupdate -h
usage: softwareupdate <cmd> [<args> ...]

** Catalog Management:
	--set-catalog <URL>	Set the new catalog URL (requires privileges)

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Adobe DNG:

Canon EOS 5D:

Canon EOS 5D Mark II:

Canon EOS 5D Mark III:

Canon EOS 5D Mark IV:

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startosinstall --usage
Usage: startosinstall

Arguments
--applicationpath, a path to copy of the OS installer application to start the install with.
--license, prints the user license agreement only.
--agreetolicense, agree to license the license you printed with --license.
--rebootdelay, how long to delay the reboot at the end of preparing. This delay is in seconds and has a maximum of 300 (5 minutes).
--pidtosignal, Specify a PID to which to send SIGUSR1 upon completion of the prepare phase. To bypass "rebootdelay" send SIGUSR1 back to startosinstall.
--converttoapfs, specify either YES or NO on if you wish to convert to APFS.

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<installer-gui-script minSpecVersion="1">
    <options hostArchitectures="i386,x86_64" rootVolumeOnly="true" launchMode="integrated" launch="true" require-scripts="true" customize="never"/>
    <title>SU_TITLE</title>
    <script/>
    <volume-check script="VolumeCheck()">
        <allowed-os-versions>
            <os-version min="10.9.5" before="10.11"/>
        </allowed-os-versions>
    </volume-check>

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Digital camera RAW formats supported by iOS 11 and macOS High Sierra
iOS and macOS include system-level support for RAW images taken by many cameras.

iOS 11 and macOS High Sierra include enhanced support for processing digital camera RAW formats, providing better detail and improved noise reduction. These RAW formats offer greater image-editing flexibility on macOS with Photos, Preview, and many third-party apps, and on iOS using third-party apps that support RAW.1
Support for additional RAW formats is added over time. This list is current as of 26 November 2018 and reflects compatibility for the latest versions of iOS 11 and macOS High Sierra. 

Canon EOS 1000D
Canon EOS 100D
Canon EOS 10D
Canon EOS 1100D

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32-bit app compatibility with macOS High Sierra 10.13.4
About the transition to 64-bit technology and how it affects 32-bit apps.

     App is not optimized for your Mac. This app needs to be updated by its developer to improve compatibility.
   

State-of-the-art technology is what makes a Mac a Mac. All modern Macs include powerful 64-bit processors, and macOS runs advanced 64-bit apps, which can access dramatically more memory and enable faster system performance. The technologies that define today's Mac experience—such as Metal graphics acceleration—work only with 64-bit apps. To ensure that the apps you purchase are as advanced as the Mac you run them on, all future Mac software will eventually be required to be 64-bit.

Apple began the transition to 64-bit hardware and software technology for Mac over a decade ago, and is working with developers to transition their apps to 64-bit. At our Worldwide Developers Conference in 2017, Apple informed developers that macOS High Sierra would be the last version o

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Using HEIF or HEVC media on Apple devices
Upgrade to iOS 11 or macOS High Sierra to view, edit, or duplicate HEIF or HEVC media captured with an iOS device.

iOS 11 and macOS High Sierra include support for these new, industry-standard media formats:

HEIF (High Efficiency Image File Format) for photos
HEVC (High Efficiency Video Coding), also known as H.265, for videos
HEIF and HEVC offer better compression than JPEG and H.264, so they use less storage space on your devices and iCloud Photo Library, while preserving the same visual quality.

To fully view, edit, or duplicate HEIF and HEVC media on your device, upgrade to the latest version of iOS 11 or macOS High Sierra.