# Configure the ROI and Feature Size

1. Within the Read tool, set the ROI and Feature Size.

   Note: For more information on setting the Feature Size, see the Blue Read Tool – Feature Size topic.
2. In the Image Display window, click the first image.
3. The rectangular ROI will encompass the entire image.
4. Re-size the ROI so that it encloses the characters. There are two handles on the ROI, in the upper-left and lower-right corners, that you can use to drag and re-size the ROI so that it covers the characters and their possible locations within all of the images.
5. Once the ROI is set, press the Apply button.
6. This will then apply the ROI setting to all of the images.
7. After the ROI has been applied, click the first image again.

8. In the bottom left corner of the display will be an interactive Feature Size box, which indicates the default character size. You can grab it and drag it up to a character and re-size it so that it fits a character.

   Tip: Try to keep from making it so big that it encloses parts of another character. After setting it on one character, you can then move it around to the other characters to ensure it's sized correctly.

9. Once the character size is set, press the Book icon to process all of the images based on the new character size. This will apply the new character size to all of the images.

   Note: If the character size is changed in one image, the change will automatically be applied to all of the other images. However, if the Scaled parameter option is active, the features will only adapt their aspect-ratio to meet the character of the nominal feature-size and clamp the features to within the interval [1/4, 4] of the nominal feature size. That will require pressing the Book icon to reprocess the images and see the result of the Feature Size change on the rest of the images in the training set.