Project 3 Notes on Resizing Images with Python PIL

1. Vernon's Machine Vision book:

http://homepages.inf.ed.ac.uk/rbf/BOOKS/VERNON/toc.htm

2. Pillow

• The image processing library Pillow (PIL)'s Image module provides the resize() menthod to resize images.
  
• Image.resize(size, resample=0)
• https://pillow.readthedocs.io/en/stable/handbook/overview.html

3. for loops

4. glob.glob()

How to Use Image.resize()

• Pass a tuple of (width, height) to the argument size.
• Pass the filter for resample.

  Resampling Filters
  -NEAREST (which is used by default)
  -BOX
  -BILINEAR
  -HAMMING
  -BICUBIC
  -LANCZOS

• For images created by the library itself (via a factory function, or by running a method on an existing image), this attribute is set to None.
• If the image was not read from a file, it is set to None.
• Image size needs to be specified as integers.

import sys
sys.version

'3.6.9 (default, Oct  8 2020, 12:12:24) \n[GCC 8.4.0]'

pip uninstall PIL

WARNING: Skipping PIL as it is not installed.

pip install Pillow==8.1.0

Requirement already satisfied: Pillow==8.1.0 in /usr/local/lib/python3.6/dist-packages (8.1.0)

import PIL
PIL.__version__

'8.1.0'

from google.colab import drive
drive.mount('/content/drive')

Drive already mounted at /content/drive; to attempt to forcibly remount, call drive.mount("/content/drive", force_remount=True).

import shutil
shutil.unpack_archive('/content/drive/My Drive/pallasite.zip', '/content/drive/My Drive')

from PIL import Image
im = Image.open('/content/drive/My Drive/pallasite/Esquel.jpg')
print(im.format, im.size, im.mode)
im

JPEG (2736, 2014) RGB