If set to true, the methods hs.screen:toEast(), :toNorth() etc. will disregard screens that lie perpendicularly to the desired axis

Gets the current state of the screen-related accessibility settings

• None

• A table containing the following keys, and corresponding boolean values for whether the user has enabled these options:
  • ReduceMotion (only available on macOS 10.12 or later)
  • ReduceTransparency
  • IncreaseContrast
  • InvertColors (only available on macOS 10.12 or later)
  • DifferentiateWithoutColor

Finds screens

• hint - search criterion for the desired screen(s); it can be:
  • a number as per hs.screen:id()
  • a string containing the UUID of the desired screen
  • a string pattern that matches (via string.match) the screen name as per hs.screen:name() (for convenience, the matching will be done on lowercased strings)
  • an hs.geometry point object, or constructor argument, with the x and y position of the screen in the current layout as per hs.screen:position()
  • an hs.geometry size object, or constructor argument, with the resolution of the screen as per hs.screen:fullFrame()
  • an hs.geometry rect object, or constructor argument, with an arbitrary rect in absolute coordinates; the screen containing the largest part of the rect will be returned

• one or more hs.screen objects that match the supplied search criterion, or nil if none found

• for convenience you call this as hs.screen(hint)

Example:

hs.screen(724562417) --> Color LCD - by id
hs.screen'Dell'      --> DELL U2414M - by name
hs.screen'Built%-in' --> Built-in Retina Display, note the % to escape the hyphen repetition character
hs.screen'0,0'       --> PHL BDM4065 - by position, same as hs.screen.primaryScreen()
hs.screen{x=-1,y=0}  --> DELL U2414M - by position, screen to the immediate left of the primary screen
hs.screen'3840x2160' --> PHL BDM4065 - by screen resolution
hs.screen'-500,240 700x1300' --> DELL U2414M, by arbitrary rect

Restore the gamma settings to defaults

• None

• None

• This returns all displays to the gamma tables specified by the user's selected ColorSync display profiles

Returns a list of all connected and enabled screens, along with their "position" relative to the primary screen

• None

• a table where each key is an hs.screen object, and the corresponding value is a table {x=X,y=Y}, where X and Y attempt to indicate each screen's position relative to the primary screen (which is at {x=0,y=0}); so e.g. a value of {x=-1,y=0} indicates a screen immediately to the left of the primary screen, and a value of {x=0,y=2} indicates a screen positioned below the primary screen, with another screen inbetween.

• grid-like arrangements of same-sized screens should behave consistently; but there's no guarantee of a consistent result for more "exotic" screen arrangements

Returns all the screens

• None

• A table containing one or more hs.screen objects

Returns the 'main' screen, i.e. the one containing the currently focused window

• None

• An hs.screen object

Gets the primary screen

• None

• An hs.screen object

Transforms from the absolute coordinate space used by OSX/Hammerspoon to the screen's local coordinate space, where 0,0 is at the screen's top left corner

• geom - an hs.geometry point or rect, or arguments to construct one

• an hs.geometry point or rect, transformed to the screen's local coordinate space

Returns a table containing the screen modes supported by the screen. A screen mode is a combination of resolution, scaling factor and colour depth

• None

• A table containing the supported screen modes. The keys of the table take the form of "1440x900@2x" (for a HiDPI mode) or "1680x1050@1x" (for a native DPI mode). The values are tables which contain the keys:
• w - A number containing the width of the screen mode in points
• h - A number containing the height of the screen mode in points
• scale - A number containing the scaling factor of the screen mode (typically 1 for a native mode, 2 for a HiDPI mode)
• freq - A number containing the vertical refresh rate in Hz
• depth - A number containing the bit depth of the display mode

• Prior to 0.9.83, only 32-bit colour modes would be returned, but now all colour depths are returned. This has necessitated changing the naming of the modes in the returned table.
• "points" are not necessarily the same as pixels, because they take the scale factor into account (e.g. "1440x900@2x" is a 2880x1800 screen resolution, with a scaling factor of 2, i.e. with HiDPI pixel-doubled rendering enabled), however, they are far more useful to work with than native pixel modes, when a Retina screen is involved. For non-retina screens, points and pixels are equivalent.

Returns a table describing the current screen mode

• None

• A table containing the current screen mode. The keys of the table are:
• w - A number containing the width of the screen mode in points
• h - A number containing the height of the screen mode in points
• scale - A number containing the scaling factor of the screen mode (typically 1 for a native mode, 2 for a HiDPI mode)
• freq - A number containing the vertical refresh rate in Hz
• depth - A number containing the bit depth
• desc - A string containing a representation of the mode as used in hs.screen:availableModes() - e.g. "1920x1080@2x 60Hz 4bpp"

Gets/Sets the desktop background image for a screen

• imageURL - An optional file:// URL to an image file to set as the background. If omitted, the current file URL is returned

• the hs.screen object if a new URL was set, otherwise a string containing the current URL

• If the user has set a folder of pictures to be alternated as the desktop background, the path to that folder will be returned.

Returns the screen frame, without the dock or menu.

• None

• an hs.geometry rect describing this screen's "usable" frame (i.e. without the dock and menu bar) in absolute coordinates

Returns the absolute rect of a given unit rect within this screen

• unitrect - an hs.geometry unit rect, or arguments to construct one

• an hs.geometry rect describing the given unit rect in absolute coordinates

• this method is just a convenience wrapper for hs.geometry.fromUnitRect(unitrect,this_screen:frame())

Returns the screen frame, including the dock and menu.

• None

• an hs.geometry rect describing this screen's frame in absolute coordinates

Gets the screen's brightness

• None

• A floating point number between 0 and 1, containing the current brightness level, or nil if the display does not support brightness queries

Gets the screen's ForceToGray setting

• None

• A boolean, true if the ForceToGray mode is set, otherwise false

Gets the current whitepoint and blackpoint of the screen

• None

• A table containing the white point and black point of the screen, or nil if an error occurred. The keys whitepoint and blackpoint each have values of a table containing the following keys, with corresponding values between 0.0 and 1.0:
• red
• green
• blue

Gets a table of information about an hs.screen object

• None

• A table containing various information, or nil if an error occurred.

Gets the screen's InvertedPolarity setting

• None

• A boolean, true if the InvertedPolarity mode is set, otherwise false

Gets the UUID of an hs.screen object

• None

• A string containing the UUID, or nil if an error occurred.

Returns a screen's unique ID

• None

• A number containing the ID of the screen

Transforms from the screen's local coordinate space, where 0,0 is at the screen's top left corner, to the absolute coordinate space used by OSX/Hammerspoon

• geom - an hs.geometry point or rect, or arguments to construct one

• an hs.geometry point or rect, transformed to the absolute coordinate space

Make this screen mirror another

• aScreen - an hs.screen object you wish to mirror
• permanent - an optional bool, true if this should be configured permanently, false if it should apply just for this login session. Defaults to false.

• true if the operation succeeded, otherwise false

Stops this screen mirroring another

• permanent - an optional bool, true if this should be configured permanently, false if it should apply just for this login session. Defaults to false.

• true if the operation succeeded, otherwise false

Returns the preferred name for the screen set by the manufacturer

• None

• A string containing the name of the screen, or nil if an error occurred

Gets the screen 'after' this one (in arbitrary order); this method wraps around to the first screen.

• None

• An hs.screen object

Return a given screen's position relative to the primary screen - see 'hs.screen.screenPositions()'

• None

• two integers indicating the screen position in the current screen arrangement, in the x and y axis respectively.

Gets the screen 'before' this one (in arbitrary order); this method wraps around to the last screen.

• None

• An hs.screen object

Gets/Sets the rotation of a screen

• degrees - An optional number indicating how many degrees clockwise, to rotate. If no number is provided, the current rotation will be returned. This number must be one of:
  • 0
  • 90
  • 180
  • 270

• If the rotation is being set, a boolean, true if the operation succeeded, otherwise false. If the rotation is being queried, a number will be returned

Sets the screen's brightness

• brightness - A floating point number between 0 and 1

• The hs.screen object

Sets the screen's ForceToGray mode

• ForceToGray - A boolean if ForceToGray mode should be enabled

• None

Sets the current white point and black point of the screen

• whitepoint - A table containing color component values between 0.0 and 1.0 for each of the keys:
  • red
  • green
  • blue
• blackpoint - A table containing color component values between 0.0 and 1.0 for each of the keys:
  • red
  • green
  • blue

• A boolean, true if the gamma settings were applied, false if an error occurred

• If the whitepoint and blackpoint specified, are very similar, it will be impossible to read the screen. You should exercise caution, and may wish to bind a hotkey to hs.screen.restoreGamma() when experimenting

Sets the screen's InvertedPolarity mode

• InvertedPolarity - A boolean if InvertedPolarity mode should be enabled

• None

Sets the screen to a new mode

• width - A number containing the width in points of the new mode
• height - A number containing the height in points of the new mode
• scale - A number containing the scaling factor of the new mode (typically 1 for native pixel resolutions, 2 for HiDPI/Retina resolutions)
• frequency - A number containing the vertical refresh rate, in Hertz of the new mode
• depth - A number containing the bit depth of the new mode

• A boolean, true if the requested mode was set, otherwise false

• The available widths/heights/scales can be seen in the output of hs.screen:availableModes(), however, it should be noted that the CoreGraphics subsystem seems to list more modes for a given screen than it is actually prepared to set, so you may find that seemingly valid modes still return false. It is not currently understood why this is so!

Sets the origin of a screen in the global display coordinate space. The origin of the main or primary display is (0,0). The new origin is placed as close as possible to the requested location, without overlapping or leaving a gap between displays. If you use this function to change the origin of a mirrored display, the display may be removed from the mirroring set.

• x - The desired x-coordinate for the upper-left corner of the display.
• y - The desired y-coordinate for the upper-left corner of the display.

• true if the operation succeeded, otherwise false

Sets the screen to be the primary display (i.e. contain the menubar and dock)

• None

• A boolean, true if the operation succeeded, otherwise false

Saves an image of the screen to a JPG file

• filePath - A string containing a file path to save the screenshot as
• screenRect - An optional hs.geometry rect (or arguments for its constructor) containing a portion of the screen to capture. Defaults to the whole screen

• None

Saves an image of the screen to a PNG file

• filePath - A string containing a file path to save the screenshot as
• screenRect - An optional hs.geometry rect (or arguments for its constructor) containing a portion of the screen to capture. Defaults to the whole screen

• None

Captures an image of the screen

• rect - An optional rect-table containing a portion of the screen to capture. Defaults to the whole screen

• An hs.image object, or nil if an error occurred

Gets the first screen to the east of this one, ordered by proximity to its center or a specified point.

• from - An hs.geometry.rect or hs.geometry.point object; if omitted, the geometric center of this screen will be used
• strict - If true, disregard screens that lie completely above or below this one (alternatively, set hs.screen.strictScreenInDirection)

• An hs.screen object, or nil if not found

Gets the first screen to the north of this one, ordered by proximity to its center or a specified point.

• from - An hs.geometry.rect or hs.geometry.point object; if omitted, the geometric center of this screen will be used
• strict - If true, disregard screens that lie completely to the left or to the right of this one (alternatively, set hs.screen.strictScreenInDirection)

• An hs.screen object, or nil if not found

Gets the first screen to the south of this one, ordered by proximity to its center or a specified point.

• from - An hs.geometry.rect or hs.geometry.point object; if omitted, the geometric center of this screen will be used
• strict - If true, disregard screens that lie completely to the left or to the right of this one (alternatively, set hs.screen.strictScreenInDirection)

• An hs.screen object, or nil if not found

Returns the unit rect of a given rect, relative to this screen

• rect - an hs.geometry rect, or arguments to construct one

• an hs.geometry unit rect describing the given rect relative to this screen's frame

• this method is just a convenience wrapper for hs.geometry.toUnitRect(rect,this_screen:frame())

Gets the first screen to the west of this one, ordered by proximity to its center or a specified point.

• from - An hs.geometry.rect or hs.geometry.point object; if omitted, the geometric center of this screen will be used
• strict - If true, disregard screens that lie completely above or below this one (alternatively, set hs.screen.strictScreenInDirection)

• An hs.screen object, or nil if not found