The ToolBox contains different cursor tools that allow you to perform a variety of operations on your image. They can all be chosen by clicking on the button in the Box, but also by typing the letter that is given in brackets in the description below. Some of them, with a small arrowhead at the bottom right corner, have multiple choices, which you also will see from the list below. The lower part of the ToolBox contains control areas for colour selection, and different display options. Some tools in the toolbox have options that appear in the context-sensitive Options bar that will appear at the top of the window just below the Menu bar. Leaving the cursor on a button will show the name of the tool as well as the shortcut key in brackets. To save space, I will only describe the tools that are useful when working with “scientific” images.

Colour definition
We start with the colour definition area. The two large squares show the current foreground and background colours. Generally, any operations that add information, such as paint tools and type tools apply the foreground colour, whereas erasing or cutting will bring up the background colour. You can set them to any colour by clicking in the respective square and then set the colour in the Color Picker dialogue. If you want to swap background to foreground, you click on the double arrow in the upper right corner (X). The two smaller squares in the lower left corner gives you the default setting of black foreground and white background (D).

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