Image filter for color manipulation (Pretty sunset!)

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by Jay1743

Gallery

So I was playing around with Python's Image Manipulation Library (PIL) and I wrote my own image filter. It allows the user to transpose the red, green, and blue values in an image in any way they want.

Here's a picture I took of the sun setting over the Mississippi near Baton Rouge. I used the filter to transpose all the red and blue values - so the light blue sky becomes a light red sky, and the deep red sunset becomes an alien blue sunset. (For what it's worth, I'm pretty sure a blue sunset like this is a physical impossibility. Rayleigh scattering doesn't work that way)

Using the filter is easy. Install PIL and run this program:

#!/usr/bin/python

import Image, sys

correctusage = "img <input_filename> <output_format>\noutput_format = RBG, BRG, BGR, GRB, or GBR"

if (len(sys.argv) != 3):
    print "ERROR - incorrect usage"
    print correctusage
    sys.exit(1)

dotpos = sys.argv[1].rfind(".")
basename = sys.argv[1][0:dotpos]
extension = sys.argv[1][dotpos+1:]

infile = Image.open("sunset.jpg")
r, g, b = infile.split()

if (sys.argv[2].upper()=="RBG"):
    outpic = Image.merge("RGB", (r, b, g))
elif (sys.argv[2].upper()=="BRG"):
    outpic = Image.merge("RGB", (b, r, g))
elif (sys.argv[2].upper()=="BGR"):
    outpic = Image.merge("RGB", (b, g, r))
elif (sys.argv[2].upper()=="GRB"):
    outpic = Image.merge("RGB", (g, r, b))
elif (sys.argv[2].upper()=="GBR"):
    outpic = Image.merge("RGB", (g, b, r))
else:
    print "ERROR - Unrecognized output format."
    print correctusage
    sys.exit(2)

outpic.save(basename + "_mod." + extension)

Keywords

color 11,897, tool 694, filter 73

Details

Type: Picture Series

Published: 14 years, 5 months ago

Rating: General

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