@ Kirk and Eric
In the thread that HGB links to, you'll see that he raises a conjecture that the sparkling pixels do not correspond to heat transients, and leaves it as a conjecture. Which is fine, but not sufficient to establish the conclusion above.
No, I do not leave it as a conjecture that the white pixels are not mini-explosions but instead just out of range. This is quite obvious if you care to look at (and are able to understand the meaning of) the temperature scale at the bottom of the picture.
Kirkshanahan, I would like to hear your opinion too, I think Eric needs another vote against his mini-explosions. (Not to say that physics is a democracy.)