You can open the Preferences dialog box using the button in the upper right corner of the program window or using the File -> Preferences... command. It contains several tabs with different parameters:
Interface Theme. Select a style of the program interface: Light or Dark.
Interface Scale. Choose the size of the interface elements. When it is set to Auto, the program workspace will automatically scale to fit the screen resolution.
Language. Select an interface language from the drop-down list.
History Size (0-100). This parameter defines the number of document states displaying in the History panel. If the value is set to 0, the panel contains an unlimited number of states.
Recent Files (5-30). The number of recent documents. The option allows recently closed files to be quickly re-opened.
Autosave. If the check-box is enabled, a recovery file is automatically generated at the specified time interval. It helps you retrieve unsaved files after an accidental closure or crash.
File Type for New Single-Layer Images. Select a default extension for saving new single-layer files (JPG, PNG, TIFF, or AKVIS).
Bezier Flattening Threshold. At low values, the contour of a vector shape is smoother, increasing the values makes it jagged.
Launch Start Screen. If the check-box is enabled, the Image Window provides quick access to creating a new file and opening previously used files. To pin a document in the list of recently opened files, click the button next to it. To unpin the document, press the button .
Enable Learn Panel. If the check-box is enabled, the panel with links to tutorials appears at the bottom of the Start Screen.
The Use GPU check-box lets you turn on GPU acceleration.
Filters & Plugins
Preview Window Size (in pixels). The parameter sets the size of the preview window used in effects and adjustments. The size of the area can vary from 200x200 px to 2000x2000 px. You can manage the displaying of the preview window by enabling/disabling the Fixed Preview Area check-box in the parameter panel.
Processing Size Limit (in megapixels). Only for the Neon built-in plugin. This parameter accelerates image processing by temporary reducing the size of the image to be processed. When the file size (in megapixels) does not exceed the defined value, the image is processed in the usual way. If the loaded file is larger, the program will reduce the image, process it and enlarge it again to the initial size.
Display Settings Panel Only check-box. Enable the check-box to display only the Settings Panel when launching the effects and filters. All other panels attached to it will be hidden (except for Toolbar, Navigator, and Hints).
Plugins Directory. Specify the path to external plugins compatible with the AliveColors image editor. To add a new path, click the button and select a directory. Press on to remove a path.
Guides & Grid
You can show/hide the guideline elements using the Workspace menu. The parameters are divided into three groups:
In the Rulers section, you can adjust the color of the ruler lines:
You can change the Color of each element by clicking the corresponding color plate: Background, Divisions, Cursor Marker.
Select a Unit of measurement in the drop-down list or by clicking a ruler with the right mouse button.
In the Guidelines section, you can change the appearance of guidelines:
Select a Color of guidelines by clicking on the color plate.
In the Style drop-down list, specify the type of lines: Solid Lines, Dashed Lines, or Dots.
Using the Grid section, you can change the appearance of the grid, which consists of base lines and auxiliary lines.
Color of the grid lines can be changed by clicking on the color plate.
Step adjusts the grid spacing between the major lines. You can change units for this option.
Subdivisions - this option defines the spacing between auxiliary lines.
You can adjust a view mode for the grid lines (Lines, Dashed Lines, Dots).
There are two drop-down lists for each type of lines: Base Lines and Auxiliary Lines.