What's the problem?

Took some pictures of my daughter eating today with a friends flash gun, the first time i had used a flash gun, used RAW as usual and when i opened the pictures in ACR most of them have blue pixels in the pupil and other places.

I presumed that if it's completely underexposed and there's no detail that it would be black, rather than blue, completely forgot the ISO was set to 1600, could that be it?

I'm sure it's something really daft i'm doing, but thought i would ask.

Here's a picture to illustrate

You have the (shadow) clipping warning activated. Click on the blue triangle (histogram upper left)

René Damkot wrote in post #9455019
You have the (shadow) clipping warning activated. Click on the blue triangle (histogram upper left)

Bingo!

This shows where the shadows have clipped to pure black.

See, i told you i was stupid!!!

carguy4471 wrote in post #9455047
Bingo!

This shows where the shadows have clipped to pure black.

Which is OK by the way if those areas are in fact devoid of detail...

Of course you'll also see this (in red) for specular highlights, like light glistening off a shiny chromed surface.