Trigger Images Explained

What is a Trigger Image?

Trigger Images are the real world images or objects you want Aurasma to be able to recognise in order to deliver an AR experience on your mobile device. You can upload Trigger Images to your Aurasma Studio account where they will automatically be trained by our Studio to be recognised by our technology.

What specifications do Trigger Images need to meet to be uploaded and recognised successfully?

A Trigger Image needs to be:

• A JPEG or PNG file
• Less than 500,000 pixels in size (width x height) when uploaded to your account

What makes for a strong, easily recognisable Trigger Image?

Using a good Trigger is the most crucial step in creating a great Aurasma experience. You can have the most amazing video content or 3D animations, but without a dependable Trigger Image, the performance of the Aura will be negatively affected.

A good Trigger Image means the Aura will activate smoothly and the Overlays will track well.

Qualities for good Trigger Images are:

  • Tonal variation and contrast
  • Unique shapes and forms
  • Lots of detail across the entire image


What makes a bad Trigger Image?

  • Sparse images, including basic logos
  • Very dark images with no tonal variation
  • Recurring and identical features (patterns, text)
  • Blurs and gradients



Was this article helpful?
2 out of 3 found this helpful
Have more questions? Submit a request


  • Avatar
    John Sham

    Hi, I am reading this thread on a LED / LCD monitor. And the good example traigger image cannot be detected by my Aurasma app!! In fact, my aurasma app can only detect about 1 out of 10 trigger images via a monitor. Are signal interferences the reason behind?
    This is essential for my audience as well as creator as usability will be key for my aura project to be successful. Would you please provide a solution?
    Thank you very much.

  • Avatar

    Would love to know the answer to this.

  • Avatar
    Aurasma Services Team
    When viewing images on a monitor the devices camera adjusts its exposure balance - commonly images are viewed with a white background/surround (like here on the website). so the camera is compensating for all the while by making the view darker (because it thinks its really bright light). If you viewed the same image on a darker background it would look brighter, you'll see it too if you move closer to the image on the screen, filling the view with more image and less white space. Just one of those hardware things!
Powered by Zendesk