<<TableOfContents>>

The following example shows various ways of adding, subtracting, multiplying and dividing images. The given example uses 2D images but the functionality generalizes for 3D images.

= Adding and multiplying images =

First I make different two example images that have the same dimensions

{{{#!python
[someone@localhost] e2.py

Welcome to EMAN2
Prompt provided by IPython
Enter '?' for ipython help

In [3]:  A = test_image(0)

In [4]:  B = test_image(1)
}}}

''or try a = test_image_3d(2), a = test_image(0) etc - see the [[EMAN2/Galleries/Testimages|test image gallery]].''


== Add/multiply/subtract/divide images and store the result in a new image ==

{{{#!python
In [5]: C = A + B # add two images, the result is stored in C

In [6]: display(C) # observe C

In [7]: C = A * B # multiply the two images component wise, the result is stored in C

In [7]: C = A / B # division

In [8]: C = A - B # subtraction
}}}

== Add/multiply B and A, store result in A ==

{{{#!python
In [9]: A.add(B) # Add the pixels of A to the pixels of B - result stored in A

In [10]: A.mult(B) # Multiple the pixels in a by the pixels of B - result stored in A

}}}

== Subtract B from A and store it in A ==


{{{#!python
In [11]: C = B*-1 # multiply B by negative one, store it C

In [12]: A.add(C) # equivalent to subtracting B from A

In [13]: A.add(B*-1) # equivalent to line above

}}}