====== StackwiseArithmetics ======
Here, fundamental arithmetic operations can be applied, which will be using the full stack of input images.

===== Usage =====
An input stack of images/3Ds will be subjected to a arithmetic operation, according to the selected operator. Since only one input and one output are available, no further information regarding I/O are provided.

===== Processors =====
|< 100% 30% >|
^ Operator            ^ Description     ^
| Sum images          | Sums up all input images into one image. |
| Average images      | Averages all input images into one image. |
| Calculate variance  | Calculates a variance image, where the value of a pixel represents the pixel value variance of all images at the corresponding pixel position. |