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Darken/Lighten an Image (Python)

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This is an application of the Python Image Library (PIL) and shows you how simple it is to do pixel math on an image.

# do pixel math on an image using the PIL image library
# free from:  http://www.pythonware.com/products/pil/index.htm
# Python23 tested      vegaseat     22jan2005

import Image

# open an image file (.jpg or.png) you have in the working folder
im1 = Image.open("Audi.jpg")

# multiply each pixel by 0.9 (makes the image darker)
# works best with .jpg and .png files, darker < 1.0 < lighter
# (.bmp and .gif files give goofy results)
# note that lambda is akin to a one-line function
im2 = im1.point(lambda p: p * 0.9)

# brings up the modified image in a viewer, simply saves the image as
# a bitmap to a temporary file and calls viewer associated with .bmp
# make certain you have associated an image viewer with this file type
im2.show()

# save modified image to working folder as Audi2.jpg
im2.save("Audi2.jpg")
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vegaseat
DaniWeb's Hypocrite
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I am using Python23 and the PythonWin IDE from
http://starship.python.net/crew/mhammond/win32/
all free downloads and simple to use.

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vegaseat
DaniWeb's Hypocrite
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At this point PIL is only available for Python v2.3, sorry! I hope this will change soon.

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vegaseat
DaniWeb's Hypocrite
6,984 posts since Oct 2004
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The Python Image Library (PIL) is now available for Python24.
Download and instal
PIL-1.1.5.win32-py2.4.exe [533k]
from
http://effbot.org/downloads/#imaging

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