This dialog box offers several preferences that change the scale bar's appearance.
Opening the dialog box
To open this dialog box, use the Tools > Options... command and select the Scale Bar > Display entry in the tree structure.
See also
Size
The scale bar will be displayed horizontally in the image window. This orientation of the scale bar is preset.
Choose between a small, medium or large, scale bar, in the Length list. This length is not an absolute specification of the bar's length, rather it states the maximum permissible length of the scale bar in relation to the image: A small scale bar (option Small) may not be longer than 1/8 of the image's width, a medium option (option Medium), not longer than 1/4 of the image's width, and a large one, not longer than 1/2 of the image's width (option Large).
The actual length of the scale bar is calculated using the current image calibration. The height of the scale bar's frame, and the font size, will not be influenced by the options that were here chosen in the Length list.
Position
You can position the scale bar in any of the image window's four corners. Simply click the button that shows the position you want.
Why are some positions not available?
It can happen that one (or more) positions aren't available. In this case, the position in question is already in use for another function.
By using the View > Info Stamp command, you can, in addition to the scale bar, have some information on the current image, displayed in the image window. Then, the info stamp's current position can't be chosen for the scale bar. The corresponding button is gray.
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