Zbynek Vrastil


The Annotation is a text rendering module and can be found under Painting category. It can render a single line of text with specified font and color. You can also display a leader line from text to an arbitrary point in the image. Annotation is a dynamic process that allows you to position the text and leader in the image with a mouse. The text is not rendered into image pixels until you apply the process.


Here you enter the text of the annotation. You can also check the Show Leader checkbox if you want to show the leader line from the text to a point in the image.


Font and color are configured here. Font combobox allows you to choose one of the fonts installed in your system. Size determines the size of the font in typographical points. The text can be made Bold, Italic or Underlined with corresponding checkboxes. The last checkbox Shadow renders one-pixel wide black shadow under the text and the leader.

Color combobox provides a list of predefined colors. You can also define a custom color by clicking on the rectangle just beside the combobox. In such case, a simple color definition dialog is launched.

Dynamic Placement

After you defined the parameters of your annotation (or before if you like), click somewhere in the image to show the dynamic preview of the annotation. The annotation is displayed in the image. Any change to the annotation parameters is immediately reflected in the image. The dashed rectangle around the text indicates the area where you can grab the text with a mouse and move it around the image. This is also indicated by a change of the mouse cursor.

In case you checked Show Leader checkbox, the leader line is also displayed. Small dashed square at the endpoint again indicates the area which can be used to position the leader with a mouse.

Helper rectangles disappear when you execute the process and the annotation is rendered to the image. You can immediately start positioning of the next annotation with a single mouse click in the image.

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