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Flashing checklist

Flashing checklist

Make sure your ad will pass our flashing testing

There are strict rules about the use of flashing images and regular patterns in adverts to reduce the risk of exposing tv viewers that suffer from photosensitive epilepsy to potentially harmful stimuli.

Ofcom has produced guidelines on Flashing Images, see below.

Ofcom Flashing Guidelines
If your edit fails our flashing test two options are available:

  • You can use our Online Flash Test to see where in the ad the fail has occurred, amend the edit and re-submit with a new clock number.
  • Alternatively you can provide us with a ‘Harding certificate’ that indicates the edit has passed the flashing test. For further details about the Harding certificate get in touch with either your Clearcast contact or Mark or Greg in the Operations team via 020 7339 4700.
  • When you submit an ad to us, we run it through our online flashtest as part of the clearance process.

This means automated software checks for flashing or patterns that are not permitted.

If your ad fails this test, you must upload a valid flashing certificate into Adway. It must contain this information:

  • Ad title — this must include the ad’s full clock number.
  • Duration of material — this is the length of the ad.
  • Video standard — must be one of the following values:
    • 576i50
    • 576p25
    • 720p50
    • 1080i50
    • 1080p50

  • Material status — this must be one of the following values:
    • PASSED
    • PASSED (with caution)

  • Testing algorithm used — must be v3.4.0 or more recent
    • This is the version of the HFPA-X analysis software that the ad has been tested with.
    • If you have questions about flashing images or repeating patterns, please speak to your Clearcast contact.

Related information: