Slides

Exercises

See Exercises 2-a  and  2-b in Übungen

Here is a simple example of how to write a command line tool:

gamma-correct

#!/usr/bin/python

import sys,os,optparse

import scipy.misc

from pylab import *

parser = optparse.OptionParser(usage="""

%prog [options] input.png output.png

Perform gamma corection

""")

parser.add_option("-g","--gamma",help="gamma value",type=float,default=1.6)

(options,args) = parser.parse_args()

image = imread(args[0])

image = image**options.gamma

scipy.misc.imsave(args[1],image)

If you put this into a file and make it executable, you can then say:

./gamma-correct -g 0.3 input.png output.png