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Select an image and click the scale button. The following dialog appears in which you can define the desired image attributes. When the image is exported, these settings are used.
If you want, you can also export a text box as an image, just select one text box and click the image scaling button, you will get the following dialog to adjust the scaling and image type.
For B&W images, GIF format is recommended.
If you decide to keep it as text, go to the dialog and click "Export as text" button.