Leginon

For summing every zbin frames in a movie, here is a python script to be used with the libraries comes with Leginon/Appion

from pyami import mrc

# change these for your case
filepath = 'your_mrc_stack_file'
outputpath = 'your_output_mrc_stack_file'
zbin = 2

# read header to find the number of frames
header = mrc.readHeaderFromFile(filepath)
number_frames = header['nz']

for i in range(number_frames/zbin):
    for j in range(zbin):
        zslice = i * zbin + j
        if j == 0:
            # initialize sum at the first one
            # This reads one frame into a numpy array
            sum = mrc.read(filepath,zslice)
        else:
            sum += mrc.read(filepath,zslice)
    if i == 0:
        # initialize the output stack
        mrc.write(sum,outputpath)
    else:
        mrc.append(sum,outputpath)

For viewing K2 image, you can use Leginon's wxPython imageviewer directly (after r17876). This works only for single image, also works for png or jpeg images

your_myami_checkout/leginon/gui/wx/TargetPanel.py your_mrc_file

The power spectrum produced after cropping the image to square can be outputted as an mrc image as well with this python script

from pyami import mrc, imagefun

input_filename = 'your_mrc_file'
output_filename = 'power.mrc'
mask_radius = 10

# read mrc file as numpy array
imarray = mrc.read(input_filename)

imageshape = imarray.shape

# easiest way to get a power spectrum that looks like optical diffraction is to first crop it
new_dim = min(imageshape)

# imarray is overwritten after cropping
imarray = imagefun.crop_at(array, (imageshape[0]/2, imageshape[1]/2), (new_dim_new_dim))
imageshape = imarray.shape

# This is the power spectrum array generation function used in Leginon
pow = imagefun.power(imarray, mask_radius)

# Write the resulting array to an mrc image file
mrc.write(pow, output_filename)