Hi Ale,
if you have time, the attached script could be used for a "generic"
demo: it just converts an image to grayscale; should work with any
image format that is supported by ImageMagick (i.e., basically *any*
image format).
Note: for running on the cloud, the script needs a VM with package
"imagemagick" installed (vanilla Ubuntu 16.04 does *not* have it).
Thanks,
R
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#! /usr/bin/env python
import os
from os.path import abspath, basename
import sys
from gc3libs import Application
from gc3libs.cmdline import SessionBasedScript
from gc3libs.quantity import GB
if __name__ == '__main__':
from grayscaler import GrayscaleScript
GrayscaleScript().run()
class GrayscaleScript(SessionBasedScript):
"""
Convert images to grayscale.
"""
def __init__(self):
super(GrayscaleScript, self).__init__(version='1.0')
def new_tasks(self, extra):
# since `self.params.args` is already a list of file names,
# just iterate over it to build the list of apps to run...
apps_to_run = []
for input_file in self.params.args:
input_file = abspath(input_file)
apps_to_run.append(GrayscaleApp(input_file, **extra))
return apps_to_run
# alternatively, you could use
# `from grayscale_app import GrayscaleApp` above
class GrayscaleApp(Application):
"""Convert a single image file to grayscale."""
def __init__(self, img, **extra):
inp = basename(img)
out = "gray-" + inp
Application.__init__(
self,
arguments=[
"convert", inp, "-colorspace", "gray", out],
inputs=[img],
outputs=[out],
stdout="stdout.txt",
stderr="stderr.txt",
**extra)
