# Blue Read Tool – Feature Size

Since the tool was trained on a common character size, you first need to adjust the tool's Feature Size parameter to match the size of the character in the images to which tool needs to be applied to. The tool's Feature Size indicator graphic is displayed in the bottom left corner of the image (shown below).

The indicator graphic can be dragged within the image, allowing you to size it based on the characters in the image. In addition, the indicator can be re-sized by dragging the re-size handle (which is displayed when hovering over the indicator). Changing the size of the indicator will also change the Feature Size parameter.

Note: Contrary to the other tools, the Blue Read tool will not reset automatically upon changing the Feature Size.