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PIL

Install

easy_install PIL

Install on mac

Mac has problem with jpeg and truetype2 library

1. Download jpeg and truetype2 package

   http://wiki.python.org/moin/MacPython/UniversalLibrariesAndExtensions
   http://freetype.sourceforge.net
   http://www.ijg.org/files/jpegsrc.v6b.tar.gz

2. For each package, do
   1. ./configure
   2. make
   3. sudo make install
3. Then, download PIL (do this again if you setup above already)
   1. http://www.pythonware.com/products/pil/
   2. sudo python setup.py install

True transparent image and paste it on the background image

import Image,ImageDraw,ImageFont,ImageChops

# Create a text image
width = 217 
height = 140 

# 1. Create a base image
baseim = Image.open("base.png")

# 2. Create a transparent text image
im = Image.new("RGB", (120, 210), (0,0,0))
alpha = Image.new("L", im.size, "black")
# Make a grayscale image of the font, white on black.
imtext = Image.new("L", im.size, 0)
drtext = ImageDraw.Draw(imtext)
font = ImageFont.truetype("Tahoma.ttf", 30) 
drtext.text((0,0), "helloworld", font=font, fill="white")

# Add the white text to our collected alpha channel. Gray pixels around
# the edge of the text will eventually become partially transparent
# pixels in the alpha channel.
alpha = ImageChops.lighter(alpha, imtext)

# Make a solid color, and add it to the color layer on every pixel
# that has even a little bit of alpha showing.
solidcolor = Image.new("RGBA", im.size, "#000000")
immask = Image.eval(imtext, lambda p: 255 * (int(p != 0)))
im = Image.composite(solidcolor, im, immask)
im.putalpha(alpha)
im.save("transtext.png", "PNG") #save for testing

# paste this on the base image with the alpha info
baseim.paste(im,(100,0),alpha)
baseim.save('helloworld.png','PNG')

Reference:

http://nedbatchelder.com/blog/200801/truly_transparent_text_with_pil.html

Captcha Example

import Image,ImageDraw,ImageFont

# Create a background image
image = Image.new('RGB', (300, 50), (220,210,190))
draw = ImageDraw.Draw(image)

# Create a text image
textImg = Image.new('RGB',(150,40),(0,0,0))
tmpDraw = ImageDraw.Draw(textImg)
textFont = ImageFont.truetype('ARIAL.TTF',36)
tmpDraw.text((0, 0), 'Hello', font = textFont, fill = (10,200,200))
textImg = textImg.rotate(-10)

# Create a mask (same size as the text image)
mask = Image.new('L',(150, 40),0) 
mask.paste(textImg,(0,0))

# Paste text image with the mask
image.paste(textImg,(100,0),mask)

image.save('hello.jpg')

Thumbnail

import os,sys
import Image


def resize(filename):
   size = 48,48
   im = Image.open(filename)
   im.thumbnail(size)
   im.convert('RGB').save(filename+'.jpg','JPEG')

resize('sample.png')
resize('sample.jpg')
resize('sample.gif')

Simple watermarking

import Image

baseim = Image.open("original.png")
logoim = Image.open("logo.png") #transparent image
baseim.paste(logoim,(baseim.size[0]-logoim.size[0],baseim.size[1]-logoim.size[1]),logoim) #specify the 3rd argument to add alpha 
baseim.save('new.png','PNG')

Reference:

http://nadiana.com/pil-tips-converting-png-gif
http://nadiana.com/pil-tutorial-how-create-button-generator

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