Jan 28, 2020 Click the window or menu to capture it. To exclude the window's shadow from the screenshot, press and hold the Option key while you click. If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.

Capture an image of the whole, or part of the screen.

Download Lightshot Screenshot for macOS 10.7 or later and enjoy it on your Mac. ‎Allows you to capture any part of your Mac screen. After capturing you can upload.
Screen capturing programs, from applications for mobile phones to PC desktop versions, differ in capabilities, design, etc. Purposes may be different – recording tutorials, remote lessons, reviews, streams, gameplay, and so on. Today we’re reviewing several screen capture applications for macOS.

Drop Shadow

To turn off the default window drop shadows, this will make your screenshot files smaller.

defaults write com.apple.screencapture disable-shadow -bool true
killall SystemUIServer

Save Screenshots to a given Location

By default screen shots are saved to the desktop, but this can be changed with a default

Set save location to ~/Desktop:
defaults write com.apple.screencapture location ~/Desktop && killall SystemUIServer

Set the file format for saved screenshots

By default screneshots are saved as .png files, supported formats are: .bmp, .gif, .jpg, .jpeg, .pdf, .tiff

Set file format to .png:
defaults write com.apple.screencapture type -string 'png'

Remote captures:

To capture screen content while logged in via ssh, you must launch screencapture in the same mach bootstrap hierarchy as loginwindow:

PID=pid of loginwindow
sudo launchctl bsexec $PID screencapture [options]

Examples

Wait 10 seconds, then take a screen capture of the entire screen including the cursor:

Screen Capture For Mac App

$ screencapture -T 10 -C ~/screencap1.png

To take a screenshot of one window, excluding the surrounding drop shadow, point and click with the mouse to take the screenshot:

$ screencapture -o -W ~/screencap2.png

Take a screen shot of the DVD player (where the normal keyboard shortcuts won't work)

$ screencapture -i ~/Desktop/dvd.png

The mouse will turn into crosshairs, hit the space bar for camera mode, now click the window the DVD is playing in.
A file called 'dvd.png' will appear on your desktop.

“The photograph itself doesn't interest me. I want only to capture a minute part of reality” ~ Henri Cartier-Bresson

Related macOS commands:

sips - Scriptable image processing system.
macOS Keyboard shortcuts
VLC will also allow screenshots of DVDs.

Drop Shadow

Save Screenshots to a given Location

Set the file format for saved screenshots

Remote captures:

Screen Capture For Mac App

How To Screen Capture For Mac Os

Screen Capture For Macos