1. How to automatically tune image contrast

from PIL import Image, ImageOps

im = Image.open('/var/www/examples/heroine.png')

im = ImageOps.autocontrast(im, cutoff = 5)
im.show()

• ImageOps.autocontrast - set contrast automatically based on given cutoff,
• cutoff = 5 - defines part of histogram (in percents) that should be removed,

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2. How to convert an image to a black-and-white color scheme

from PIL import Image, ImageFilter

im = Image.open('/var/www/examples/heroine.png')
im = im.convert('1')

im.show()

• .convert('1') - convert image to black and white colors,

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3. How to load an image over internet

from PIL import Image
import requests
from io import BytesIO

url = 'https://examples.onelinerhub.com/heroine.png'

response = requests.get(url)
img = Image.open(BytesIO(response.content))

im.show()

• requests.get - loads data from given url,
• response.content - get content previously loaded from url,

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4. How to rotate an image without cropping it

from PIL import Image, ImageEnhance

im = Image.open('/var/www/examples/heroine.png')
im = im.rotate(90, expand=True)

im.show()

• expand=True - increase image size instead of cropping while rotating,

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5. How to add rotated text to an image

The idea here is to create 2 images - one to add text to and another with the text itself. This way we can rotate second image and merge them to get desired effect.

from PIL import Image, ImageDraw, ImageFont

im = Image.open('/var/www/examples/heroine.png')
text = "I am hero"

tim = Image.new('RGBA', (500,200), (0,0,0,0))
dr = ImageDraw.Draw(tim)
ft = ImageFont.truetype('/var/www/examples/roboto.ttf', 100)
dr.text((0, 0), text, font=ft, fill=(200, 200, 0))

tim = tim.rotate(30,  expand=1)

im.paste(tim, (0,0), tim)
im.show()

• .text( - draws text with given params,
• .rotate( - rotate given image,
• .paste( - paste image with text on top of loaded image,

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