Button

Key

Operation

Description

Left

Drag

Select an area of the image.

Left

SHIFT

Drag

Select an area from the center outward.

Left

CTRL

Drag

Pan (scroll by dragging the image in the window).

Left

ALT

Drag

Make a freehand selection.

Left

Double-click

Toggle full screen mode.

Right

Click

Show the menu (full-screen only).

Right

Drag

Pan (scroll by dragging the image in the window).

Right

Double-click

Close the image.

Middle

Click

Close the image.

Wheel

Scroll vertically (you can make it zoom using Options - Viewing - Other)

Wheel

SHIFT

Scroll horizontally

Wheel

CTRL

Zoom in/out