Main interface

When launching Siril, the main interface opens.


Click anywhere onto the image below to display its functions.

Main interface

Image area

This area displays the currently loaded image. Click on Red, Green or Blue to switch between the different layers (color images only, a single BW tab is available for mono images).

Right-click on the image to display a contextual menu:



When no image is loaded, double-clicking on the image area pops the Open dialog.


Explain or link (when created) to the different items

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Click on these icons (from left to right) to:

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Click on this button to start a Livestacking session.

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Use these buttons to undo/redo last actions. This is only available if last action has been done through GUI, not by typing a command.

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Image processing

Click on this button to display the Processing menu.

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Click on this button to display and launch the scripts.

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Information bar

This bar displays the current version of Siril and the path to the current working directory.

  • To the right, informationabout available RAM and disk space id also given.

  • You can change the available number of threads used by Siril using the +/- signs.

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These buttons are used to save your results:

  • save (overwrites) the current image.

  • save with a different name and/or extension.

    starnet dialog

    Save dialog box.

    The drop-down list at the bottom right allows you to choose the type of image recorded. It automatically adds the extension to the file name. However, by staying in the Supported Image Files mode, it is possible to add any extension supported by Siril by hand and it will save in the correct file format.

  • take a snapshot of the current view (as seen on the screen, meaning preview strecthing, if any, is applied). There are two possible options. Either the snapshot is saved in the clipboard, or directly copied to the disk in the working directory.

  • change the bitdepth of the current image. The choice is between 16-bit and 32-bit.

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Burger menu

Opens the main menu, also called burger menu. Gives access to Preferences, platesolving and much more.

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Selects one of the tabs. You can also switch between the different tabs using F1 to F7 shortcuts.

More details can be found there:

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Tab window

Displays the specifics of the currently selected tab.

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Command line

Type in a command and press Enter.

  • You can press the button at the end of the line to get some help on the usage.

  • You can also abort the process being currently executed by clicking on the Stop button.

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Click on this bar to expand/retract the whole tab/tab window area.

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Image sliders

Use the top and bottom sliders to adjust the white and black points of the previewed image (in Linear mode).


Click on the name of the Image or Sequence loaded to copy its name to the clipboard (useful to paste in a command).

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Preview mode

Select the preview mode for the loaded image, between the following choices:

  • Linear

  • Logarithm

  • Square root

  • Squared

  • Asinh

  • Autostrecth (tick the High Definition box to use a deeper 20-bit LUT instead of the default 16-bit one)

  • Histogram

In Autostretch mode with color images, the toggle to the right activates/deactivates channel linking. When unlinked, the 3 layers are stretched independantly so as to give a more balanced image.


This is just a preview of the image, not the actual data (except if Linear mode is selected). Do not forget to stretch your images before saving them.

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Special views

Use these toggles to show previewed images:

  • in inverted colors

  • in false colors

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Astrometry tools

Use these toggles to show:


The loaded image needs to be plate-solved for these buttons to be active.

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Quick photometry

Use this toggle to trigger the quick photometry mode.

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Use these buttons to:

  • Zoom out

  • Zoom in

  • Zoom to fit the avaialble window space

  • Zoom to actual size


Ctrl+left clic will allow to navigate into the picture


Ctrl+mouse scroll will zoom in/out and Ctrl + 0 / 1 will zoom to fit/100%.

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Geometric transformations

Use these buttons to:

  • Rotate left

  • Rotate right

  • Mirror about horizontal axis

  • Mirror about vertical axis

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Frame selection

Click on this button to open the frame selector.

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