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Editor: DavidWoolford
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Deletions are marked like this. Additions are marked like this.
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= Set up 2 identical images = = Adding and multiplying images =

First I make different two example images that have the same dimensions
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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]: e.process_inplace('testimage.axes') ''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 [6]: f = e.copy() # f is precise replica of e
}}}
''or try a = test_image_3d(2), a = test_image(0) etc - see''
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= Make e different to f = == Add/multiply/subtract/divide images and store the result in a new image ==
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In [7]: t = Transform({"type":"eman","alt":45,"phi":20,"az":11}) In [5]: C = A + B # add two images, the result is stored in C
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In [8]: t.set_trans(1,-2,5) In [6]: display(C) # observe C
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In [9]: t.set_mirror(True) In [7]: C = A * B # multiply the two images component wise, the result is stored in C
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In [10]: e.transform(t) In [7]: C = A / B # division
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In [11]: e.mult(2.5) # multiply all pixel values by 2.5

In [12]: e.add(13) # Adds 13 to all pixels		 In [8]: C = A - B # subtraction
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= Add and multiply images = == Add/multiply B and A, store result in A ==
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In [13]: g = f + e # add two images, the result is stored in g In [9]: A.add(B) # Add the pixels of A to the pixels of B - result stored in A
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In [14]: display(g) # observe g In [10]: A.mult(B) # Multiple the pixels in a by the pixels of B - result stored in A
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In [15]: f.add(e) # Add the pixels of e into f directly }}}
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In [16]: f.mult(e) # Multiple the pixels in f by the pixels in e == Subtract B from A and store it in A ==
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In [17]: g = f * e # Multiple the pixels in f by the pixels in e and store the result in g
{{{#!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

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 and A, store result in A

   1 In [9]: A.add(B) # Add the pixels of A to the pixels of B - 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

   1 In [11]: C = B*-1 # multiply B by negative one, store it C
   2 
   3 In [12]: A.add(C) # equivalent to subtracting B from A
   4 
   5 In [13]: A.add(B*-1) # equivalent to line above

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