If you need to optimize your site you could be interested in decreasing the image size on your site. If you have thousands of images than you will want to use automated/scripted solution.
In this post:
- Install Image Pil
- Error ImportError: No module named Image for PyCharm
- Uninstall Pil/Pillow
- Decrease image keeping quality with Pil
- Decrease images by script and Pil
Install Image Pil
In this post we will use module Pil/Pillow to decrease the image size and keep the same quality of the images(or at least from user point of view). In order to use Pil/Pillow you need to install it by:
pip install pil
for python 3 you may need to use:
pip3 install pil
Sometimes admin privileges can be needed so:
sudo pip install pil
You may need to upgrade your pip:
sudo pip3 install --upgrade pip
and then install the pil.
Error ImportError: No module named Image for PyCharm
This is common error for Pil using Ubuntu 18 and Linux Mint 18 with PyCharm. You need to investigate the problem and to use appropriate solution for it.
- Check what version of Python you have setup as SDK:
- Project Structure
- Project Settings
- Python Interpreter
Check Python SDK home path
You should have something like:
- Install pil in virtual environment of PyCharm
In this case you are using virtual environment and you need to install your pil as follow:
/home/user/IdeaProjects/tools/venv/bin/pip3 install --upgrade pip /home/user/IdeaProjects/tools/venv/bin/pip3 install pillow
- If you use another installation of python you can check the version of your terminal by:
python --version which python
depending on the output you can install pil on the correct python installation.
This should solve the error:
ImportError: No module named PIL
pip uninstall PIL
alternative installation for pil
You can isntall Pillow which is a PIL fork.
easy_install Pillow pip install Pillow
or in some cases for Linux Mint 17 or Ubuntu 16 you may run:
sudo apt-get install python-imaging
Decrease image keeping quality with Pil
If you want to decrease the image size of a single picture you can do it with this code example:
from PIL import Image file = Image.open('../images/1.jpg') file.size file.save("../images/2.jpg",quality=25)
As the image 1.jpg is the input and 2.jpg is the output which are stored in another folder named images.
With this quality parameter - 25 you keep the quality and save about 4 times of the storage size:
- before - 855.9 kB
- after - 216.5 kB
Depending on the image this rate could be different. From my experiments the average images from pixabay are shrink up to 5 times without noticeable difference in quality.
Decrease images by script and Pil
You can setup a script executed by cron which to check for newly uploaded images and then to invoke script which is decreasing the uploaded images and send them to another folder:
- Set up a cron job in Ubuntu/Linux Mint:
Create new script file:
#!/bin/bash DIR="/home/user/imagesBig" inotifywait -m -e move -e create --format '%w%f' "$DIR" | while read f do python /home/user/scripts/PilDecreaseImage.py "$f" "$DIR" done
This script will call python script:
Create python file:
with this python code inside (which is getting the newly uploaded images, shrink them and save the new image in folder: /home/user/images/)
#!/usr/bin/python import sys import time from PIL import Image time.sleep(5) # optional delay for 5 seconds - in case of many images file = Image.open(sys.argv) file.size filename = sys.argv.replace(sys.argv,"") print ('filename', filename) file.save("/home/user/images/"+filename,quality=25)