Tips & Tricks

Petri dish & plaque detection

Are you having trouble with Petri dish or plaque detection in OnePetri? Here are some tips and tricks to help you get more consistent results:

  • Wherever possible, make sure that your Petri dishes are placed against a dark surface with a solid (and not patterned) background and not up against the ceiling, light, or window.
  • Try to avoid glare or significant light reflections on the Petri dishes when taking images for analysis, it may help to remove the lid and image from the top.
  • When working with small plaques, try to maximize the Petri dish’s relative area in the image by moving your device as close to the dish as possible before taking a photo.
  • Try to keep the number of Petri dishes per image to between 1 and 3. Any more than that could lead to reduction of plaque counts.


Have tips of your own you’d like to share? Send us an email ([email protected]) and they’ll be added to this page!