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{{{
[someone@localhost]$ e2.py		 The following example shows various ways of adding and multiplying images. The given example uses 3D images but the functionality generalizes for 2D images.

= Adding and multiplying images =

First I make different two example images that have the same dimensions

{{{#!python
[someone@localhost] e2.py
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In [3]: e = EMData() In [3]: a = test_image(0)
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In [4]: e.set_size(32,32,32) In [4]: b = test_image(1)
}}}
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In [5]: f = e.copy() ''or try a = test_image_3d(2), a = test_image(0) etc - see the [[EMAN2/Galleries/Testimages|test image gallery]].''
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In [5]: e.process_inplace('testimage.axes')
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In [6]: t = Transform3D(90,30,90) == Add/multiply/subtract/divide images and store the result in a new image ==
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In [7]: t.set_posttrans(1,-2,5) {{{#!python
In [5]: c = a + b # add two images, the result is stored in c
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In [8]: t.set_pretrans(2,10,-20) In [6]: display(c) # observe c
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In [9]: e.rotate_translate(t) In [7]: c = a * b # multiply the two images component wise, the result is stored in c
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In [10]: e.mult(10) In [7]: c = a / b # division
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In [11]: g = f + e In [8]: c = a - b # subtraction
}}}
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In [12]: display(g) == Add/multiply b to/against a and store it in a ==

{{{#!python
In [9]: a.add(b) # Add the pixels of b to the pixels of a - result stored in a

In [10]: a.mult(b) # Multiple the pixels in a by the pixels of b - result stored in a
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Subtract b from a and store it in a

{{{
In [11]: c = b*-1 # multiply b by negative one

In [12]: a.add(c) # equivalent to subtracting b from a

}}}

The following example shows various ways of adding and multiplying images. The given example uses 3D images but the functionality generalizes for 2D images.

Adding and multiplying images

First I make different two example images that have the same dimensions 

   1 [someone@localhost] e2.py
   2 
   3 Welcome to EMAN2
   4 Prompt provided by IPython
   5 Enter '?' for ipython help
   6 
   7 In [3]:  a = test_image(0)
   8 
   9 In [4]:  b = test_image(1)

or try a = test_image_3d(2), a = test_image(0) etc - see the test image gallery.

Add/multiply/subtract/divide images and store the result in a new image

   1 In [5]: c = a + b # add two images, the result is stored in c
   2 
   3 In [6]: display(c) # observe c
   4 
   5 In [7]: c = a * b # multiply the two images component wise, the result is stored in c
   6 
   7 In [7]: c = a / b # division
   8 
   9 In [8]: c = a - b # subtraction

Add/multiply b to/against a and store it in a

   1 In [9]: a.add(b) # Add the pixels of b to the pixels of a - result stored in a
   2 
   3 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 

In [11]: c = b*-1 # multiply b by negative one

In [12]: a.add(c) # equivalent to subtracting b from a

EMAN2/Tutorials/AddAndMultiply (last edited 2009-03-06 17:36:06 by DavidWoolford)