

This allows one to add shading and highlights to an area without creating new masks for the additional layers. In addition to this, layers can be masked by clipping them to a lower layer. Work can be done on separate layers, which can be grouped and have opacity masks. There is also a set of vector drawing tools intended for inking, which, like the raster tools, can be configured to be pen pressure-sensitive. Various raster drawing tools are implemented, such as the Airbrush, Watercolor, Pen, and Marker, which can all be easily customized, and stored in slots in the user interface of the application. Colors can be stored in the swatches panel.

An application-wide scratchpad (which can be used as a color mixing panel) is provided, which is saved between sessions. PaintTool SAI is presented by developer SYSTEMAX Software Development in Japan as a lightweight painting software featuring fully digitizer support.

This enables me to paint freely, albeit roughly, without worrying about losing the shapes. It is also possible to open multiple viewports to the same document. Before starting the painting stage, I fill in each section with a neutral colour (often shades of grey, nothing too saturated) and lock the Opacity. The toolbar on the top part of the screen also includes a button to mirror the drawing view without mirroring the actual drawing. The drawing canvas can be both zoomed and rotated using the sliders on the navigator or the hotkeys configured on the keyboard. The user interface allows multiple documents to be opened at the same time.
