# Overflow Mode

Adding two images together can produce pixel values greater than the maximum pixel value for your image type. As you configure a Two Image Add tool you can choose how to handle an overflow condition for the sum of two pixel values:

- Bounded: Limit the pixel value to the highest value for your image type (8-bit: 255, 16-bit: 65536).
- Wrap: Wrap pixel values back to zero and add any remainder.
- Shift: Divide the result pixel values by two.

The following figure shows two input images and the output image they generate with each overflow mode: