Level: Easy
Author: monkey9508
The Northern Lights appeared at exceptionally low latitudes this year due to the high level of solar activity. But from Santa's grotto at the North Pole, it's not unusual at all to see them stretching across the sky. Snowball the elf tried to capture a video of the aurora for his Instagram feed, but his phone doesn't work well in poor light, and the results were rather grainy and disappointing. Is there anything you can do to obtain a clearer image?
For this challenge we are given aurora.mp4, a file with a rather noisy looking night sky. The flag seems to be showing up in the sky, but it's barely readable. We can convert the whole video into a single image using this command:
convert aurora.mp4 -evaluate-sequence mean out.tifThis calculates the mean between all the frames and saves it as a single file:
with this we can read the flag HV23{M4gn3t0sph3r1c_d1sturb4nc3}.