Alec Bennett wrote:
I'm wondering if there's some snazzy way to get sepia image conversion
with PIL? I'm currently getting black and white like this, which works
great:
enhancer.enhance(0)
Thanks for any help.
Simple sepia toning is usually made by converting the image to
grayscale, and then attaching a brownish palette to the image. See e.g.
http://en.wikipedia.org/wiki/List_of_software_palettes#Color_gradient_palettes
To do this in PIL, convert the image to mode "L", and use putpalette to
attach a suitable palette to the image. Something like this might work:
from PIL import Image, ImageOps
def make_linear_ramp(white):
ramp = []
r, g, b = white
for i in range(255):
ramp.extend((r*i/255, g*i/255, b*i/255))
return ramp
# make sepia ramp (tweak color as necessary)
sepia = make_linear_ramp((255, 240, 192))
im = Image.open("somefile.jpg")
# convert to grayscale
if im.mode != "L":
im = im.convert("L")
# optional: apply contrast enhancement here, e.g.
im = ImageOps.autocontrast(im)
# apply sepia palette
im.putpalette(sepia)
im.save("outfile.jpg")
</F>
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