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creating color gradients using PIL


Any ideas how we can create a color gradient using Python Imaging
Library. Has any got some sample code that can give me some idea. I
need to create a horizontal and vertical color gradient for a college
project

Thanks
Nov 21 '07 #1
1 4260
On 21 Nov, 06:30, Ramdas <ram...@gmail.comwrote:
Any ideas how we can create a color gradient using Python Imaging
Library. Has any got some sample code that can give me some idea. I
need to create a horizontal and vertical color gradient for a college
project

Thanks
I use these functions for building PIL images from numpy arrays

# Convert a 2-d array with typecode 'b' to an image with mode 'P'
def numpy2pil(arr):
rows = arr.shape[0]
cols = arr.shape[1]
m = arr.tostring()
out = Image.new('L', (cols, rows), 999 )
#out.fromstring(m)
out.fromstring(m, 'raw', 'L', 0, -1)
return out

def pil2numpy(im, typecode='b'):
# tostring does something funny with '1' images (packs em
tight).
# For 'P' images, the image data is not pased through the
palette.
if im.mode != 'L' and im.mode != 'P':
print 'im.mode must be "L" or "P"'
raise 'terminate'
xsize = im.size[0]
ysize = im.size[1]
m = im.tostring()
t = fromstring(m, 'b')
tt = asarray(t, typecode)
# Note that ysize is first:
return reshape(tt, (ysize, xsize))

im = numpy2pil(myarray)
im.putpalette(palette_list)
im.save('myimage.png')

You'll need to import numpy and Image. You'll need to generate the
palette (juust a list) and image array (a numpy array) of course.

Simon Hibbs
Nov 23 '07 #2

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