# Outside Region

Option | Description
--- | ---
Do Not Write Pixels | If you are not using a destination image, this option fills pixels outside the region but within the enclosing bounding box with uninitialized values. If you are using a destination image, however, this option allows the pixels outside the region to retain the values of the underlying destination image.
Fill With a Constant Value | Fill in pixels outside the region but within the bounding box with a constant greyscale or color value, based on the input region you use as well as the format of the input image. If you are using greyscale images, specify the Greyscale Value. If you are using color images, specify values for Plane 0, Plane 1 and Plane 2, which correspond to planes for Red, Green and Blue in RGM images, or Hue, Saturation and Intensity in HSI images.