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# resize an image using the PIL image library
# free from:  http://www.pythonware.com/products/pil/index.htm
# tested with Python24        vegaseat     11oct2005
 
import Image
 
# open an image file (.bmp,.jpg,.png,.gif) you have in the working folder
imageFile = "zFlowers.jpg"
 
im1 = Image.open(imageFile)
 
# adjust width and height to your needs
width = 500
height = 420
# use one of these filter options to resize the image
im2 = im1.resize((width, height), Image.NEAREST)      # use nearest neighbour
im3 = im1.resize((width, height), Image.BILINEAR)     # linear interpolation in a 2x2 environment
im4 = im1.resize((width, height), Image.BICUBIC)      # cubic spline interpolation in a 4x4 environment
im5 = im1.resize((width, height), Image.ANTIALIAS)    # best down-sizing filter
 
ext = ".jpg"
im2.save("NEAREST" + ext)
im3.save("BILINEAR" + ext)
im4.save("BICUBIC" + ext)
im5.save("ANTIALIAS" + ext)
 
# optional image viewer ...
# image viewer  i_view32.exe   free download from:  http://www.irfanview.com/
# avoids the many huge bitmap files generated by PIL's show()
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