Thumbor on Heroku

Thumbor is a on-demand image manipulation service with cropping, resizing and filtering capabilities. When compared to other imaging libraries, the most important feature of thumbor is the smart cropping (detectors) feature which is uses machine learning (cascade classification) for detection of important point on pictures.

Example

Difference between normal and smart mode is the smart mode tries to protect focal points on picture. This difference can seen in the 2nd and 3rd picture. (on 3rd picture, focal point is shifted towards the top rows players.)

Orginal Image (w:1886 h:1227)

Cropped Image (w:1200 h:400)

Smart Cropped Image (w:1200 h:400 )

Heroku Configuration

• App Configuration
  • Stack: heroku-16
    heroku-16 used instead of heroku-18 because of the missing operating system packages (libpng, libjasper). stack-configurations
  • Buildpack: heroku/python
• Runtime
  • python-2.7.15
• Pip Packages
  • thumbor
  • opencv-python-headless
• Procfile
  • web: thumbor -p $PORT
    Simply tells the thumbor which port should used.