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swww-img(1) General Commands Manual swww-img(1) NAME swww-img SYNOPSIS swww img [OPTIONS] <path/to/img> OPTIONS -a,--all Send this command to all active `swww-daemon` namespaces. -f, --filter <FILTER> Filter to use when scaling images Available options are: Nearest | Bilinear | CatmullRom | Mitchell | Lanczos3 These are offered by the fast_image_resize crate (https://docs.rs/fast_image_resize/2.5.0/fast_image_resize/). Near- est is what I recommend for pixel art stuff, and ONLY for pixel art stuff. It is also the fastest filter. For non pixel art stuff, I would usually recommend one of the last three, though some experimentation will be necessary to see which one you like best. Note you can also pass the flag --no-resize, explained below. In which case the --filter flag will have no effect. Default is Lanczos3. -n,--namespace <namespace> Which wayland namespace to send this command to. You can specify this option multiple times to send commands to mul- tiple namespaces at once: `swww img -n <namespace1> -n <namespace 2>`. This affects the name of the `swww-daemon` socket we will use to communicate with. Specifically, our socket name is ${WAYLAND_DIS- PLAY}-swww-daemon.<specified namespace>.socket. Some compositors can have several different wallpapers per output. This allows you to differentiate between them. Most users will probably not have to set anything in this option. --no-resize Do not resize the image. Equivalent to --resize no. If this is set, the image won't be resized, and will be centralized in the middle of the screen instead. If it is smaller than the screen's size, it will be padded with the value of --fill_color, below. --resize <RESIZE> Whether to resize the image and the method by which to resize it. Possible values: • no: Do not resize the image • crop: Resize the image to fill the whole screen, crop- ping out parts that don't fit • fit: Resize the image to fit inside the screen, pre- serving the original aspect ratio • stretch: Resize the image to fit inside the screen, with- out preserving the original aspect ratio Default is crop. --fill-color <RRGGBB> Which color to fill the padding with when not resizing. Default is 000000. -o, --outputs Comma separated list of outputs to display the image at. Use swww query to know which outputs are currently being used. If it isn't set, the image is displayed on all outputs. -t, --transition-type <TRANSITION_TYPE> [Environment Variable $SWWW_TRANSITION] Sets the type of transition. Default is simple, that fades into the new image. Possible transitions are: +------+------+------+------+-------+-----+------+------+------+------+------+-----+-------+------+ | none | sim- | fade | left | right | top | bot- | wipe | wave | grow | cen- | any | outer | ran- | | | ple | | | | | tom | | | | ter | | | dom | +------+------+------+------+-------+-----+------+------+------+------+------+-----+-------+------+ none will complete the transition instantly. fade is like simple but uses bezier curves while fading the image, its a more polished looking version of simple with less artifacts The left, right, top and bottom options make the transition happen from that position to its opposite in the screen. wipe is similar to left but allows you to specify the angle for transition with the `--transition-angle` flag. wave is similar to wipe but the sweeping line is wavy. You can con- trol the "waviness" with `--transition-wave`. grow causes a growing circle to transition across the screen and allows changing the circle's center position with the `--transi- tion-pos` flag. center is an alias to grow with position set to center of screen. any is an alias to grow with position set to a random point on screen. outer is the same as grow but the circle shrinks instead of grow- ing. Finally, random will select a transition effect at random --transition-step <0-255> [Environment Variable $SWWW_TRANSITION_STEP] How fast the transition approaches the new image. The transition logic works by adding or subtracting from the cur- rent rgb values until the old image transforms in the new one. This controls by how much we add or subtract. For example, if pixel A is 000010, and we need it to transition to pixel B, which is 000020, if transition-step is 2, then in one frame pixel A will turn to 000012, in the next frame to 000014, and so on. Larger values will make the transition faster, but more abrupt. A value of 255 will always switch to the new image immediately. Default is 90. If transition-type is simple, default is 2. --transition-duration <seconds (can have decimals)> [Environment Variable $SWWW_TRANSITION_DURATION] How long the transition takes to complete, in seconds. Note this doesn't work with the simple transition. Default is 3. --transition-fps <frames per second (max 255)> [Environment Variable: $SWWW_TRANSITION_FPS] Frame rate for the transition effect. Note there is no point in setting this to a value smaller than what your monitor supports. Also note this is different from the transition-step. That one con- trols by how much we approach the new image every frame. Default is 30. --transition-angle <angle, in degrees (parsed as a float)> [Environment Variable: SWWW_TRANSITION_ANGLE] This is used for the wipe and wave transitions. It controls the an- gle of the wipe. Note that the angle is in degrees, where '0' is right to left and '90' is top to bottom, and '270' bottom to top Default is 45. --transition-pos <x,y> [Environment Variable: SWWW_TRANSITION_POS] This is only used for the grow and outer transitions. It controls the center of circle (default is center). Position values can be given in both percentage values and pixel values: float values are interpreted as percentages and integer values as pixel values. Eg.: 0.5,0.5 means 50% of the screen width and 50% of the screen height, while 200,400 means 200 pixels from the left and 400 pixels from the bottom. The value can also be an alias which will set the position accord- ingly: +--------+-----+------+-------+--------+----------+-------+---------+---------+ | center | top | left | right | bottom | top-left | top- | bottom- | bottom- | | | | | | | | right | left | right | +--------+-----+------+-------+--------+----------+-------+---------+---------+ Default is center. --invert-y <bool> [Environment Variable: SWWW_INVERT_Y] inverts the y position sent in `transition_pos` flag --transition-bezier <f1,f2,f3,f4 (all floats)> [Environment Variable: SWWW_TRANSITION_BEZIER] Bezier curve to use for the transition animation. https://cubic- bezier.com is a good website to get these values from. eg: 0.0,0.0,1.0,1.0 for linear animation Default is .54,0,.34,.99 --transition-wave <width,height (both floats)> [Environment Variable: SWWW_TRANSITION_WAVE] Currently only used for wave transition to control the width and height of each wave. Default is : 20,20 -h, --help Print help (see a summary with '-h') DESCRIPTION Sends an image (or animated gif) for the daemon to display. You can also use `-` to read from stdin instead. ABOUT THE CACHE The images sent will be cached at $XDG_CACHE_HOME/swww or $HOME/.cache/swww if $XDG_CACHE_HOME does not exist. For each monitor, there will be a file in those locations corresponding to the current image/animation being displayed. The `swww-daemon` will actually wait until the first image has been set before trying to load the cache. Finally, the cache will keep preprocessed versions of `gif`s. So, if you load a large `gif`, you would have to pay the price for its pro- cessing the first time. If you constantly load large `gif`s, this could cause the cache to get very big. You can simply run `swww clean-cache` if this happens. SEE ALSO swww-clear-cache(1) swww-daemon(1) swww-query(1) 2025-11-01 swww-img(1)
NAME | SYNOPSIS | OPTIONS | DESCRIPTION | ABOUT THE CACHE | SEE ALSO
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