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Django ImageField & Pillow

A basic reference guide to installing pillow on your local machine as well as a worst-case scenario fallback.

Virtual Environment

Make sure you are working in a virtual environment to ensure software package continuity.

If you are not working in one, install and make one with:

$ pip install virtualenv
$ virtualenv venv && cd venv

####Activate the virtual environment. On Mac/Linux:

$ source bin/activate

On Windows:

> .\Scripts\activate

Install Python Image Library (Pillow)

This provides image validation (as well as many other image-related python activities) for Django's ImageField()

$ pip install pillow

If installation fails...

You might see something like:

error: command 'cc' failed with exit status 1

----------------------------------------
Cleaning up...

Command /Users/user/Desktop/venv/bin/python -c "import setuptools, tokenize;__file__='/Users/jmitch/Desktop/venv/build/pillow/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/pt/3tv_v7lx18xft_fwzsl2l4880000gn/T/pip-F89xZT-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/user/Desktop/venv/include/site/python2.7 failed with error code 1 in /Users/user/Desktop/venv/build/pillow
Storing debug log for failure in /Users/user/.pip/pip.log

That means pillow was not installed correctly. Below are a few suggestions for troubleshooting (aka fixing) this issue.

Mac Users Troubleshooting guide

Create developer account Free at time of writing

Download Command Line Tools for Xcode. Search "command line tools" here. Download the latest for your operating system (Mavericks or Yosemite)

After XCode and command line tools are installed, open terminal and run:

$ pip install pillow

If installation still fails, continue to next section.

Try HomeBrew

Check Homebrew is installed

$which brew
/usr/local/bin/brew #should be returned

If Homebrew is not installed, visit http://brew.sh to install.

In Terminal

$ brew update
$ brew tap Homebrew/python
$ brew install pillow

If homebrew installation fails, try:

$ export CFLAGS=-Qunused-arguments
$ export CPPFLAGS=-Qunused-arguments
$ pip install pillow

Lastly try:

$ ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future pip install pillow

Linux Users Troubleshooting guide

Linux users if you get any error something like this

error: command 'gcc' failed with exit status 1 

Install the following packages in terminal

$sudo apt-get update 
$sudo apt-get install python-dev
$sudo apt-get install libevent-dev

Windows Users Troubleshooting guide

if you get error some thing like this

unable to find vcvarsall.bat

Check whether you have installed Microsoft Visual C++ 2008 or later

Also you can install pillow using easy_install

C:\>easy_install pillow

Worst-Case Fallback: If all else Fails

Use FileField() instead of ImageField() as your model field. Example:

image = models.FileField(upload_to='images/')

Instead of

image = models.ImageField(upload_to='images/')

The main advantage of "ImageField" is that checks if the file uploaded is, in fact, an actual image while "FileField" does not. Read about "ImageField" in the Django documentation here.

Cheers!

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