Blue glow

[Echnaton]

The Physicist: It is completely full, half with liquid, the other half with air.
The Homemaker: It doesn't matter, I have to wash it later either way.
The Drunk: Somebody left the ice out of my drink.

[chrisbobson]

Question, in many of the images in AS12-46 there is a blue glow around brightly lit objects (for example : AS12-46-6826).
It looks like a result of the over-exposed object but why is it a halo-like blue glow?

Could also be a blue screen halo effect perhaps.

[Sus_pilot]

Question, in many of the images in AS12-46 there is a blue glow around brightly lit objects (for example : AS12-46-6826).
It looks like a result of the over-exposed object but why is it a halo-like blue glow?

Could also be a blue screen halo effect perhaps.

Halation. When I was in high school, after seeing Nicholas and Alexandra, I deliberately shot a lot of Ektachrome (and burned a lot of mom and dad's money) trying for (and getting) the same affect.

I haven't tried it with a digital camera yet, but I suspect, given how hard the engineering types have worked to emulate film, that I'd get the same thing...

[chrisbobson]

I have a big 500mm Sigma lens, get some blue glow with that at times.

[Sus_pilot]

In this case, I'm referring to an artifact due to the film's emulsion, not the optics. 

[chrisbobson]

Also with green chromakey you can get a bluish glow.

[Sus_pilot]

Also with green chromakey you can get a bluish glow.

Doesn't look the same.   One is due to diffraction within the film emulsion and some reflection off the film itself due to sever over-exposure.  The other is caused by bleed through in the electronics. 

I'll let dwight and Jay deal with the latter, though - I'm better at photography than videography.

[chrisbobson]

Given my experience with my Sigma lens, I would guess lens effect is number one on the list of explanations.

[dwight]

Chroma key, you say? It is pretty blatantly obvious you wouldn't know a chroma key from a bucket of black level amidst a bunch of color bars.

[ka9q]

Or a bucket of blacker-than-black...

[dwight]

Mind you, I'm pretty sure a chroma-key goes hand in hand with a gen-lock.

[ka9q]

And when you open it, it leads you right to the back porch, where you may or may not find a burst of color.

[dwight]

Never the same color?

[ineluki]

Those two were useless.  First, they destroy the television camera.  Then they smudge the camera lens on one of the Hasselblads.  Then they leave a magazine on the surface.

I think all the astronauts should be fined for littering...

[ka9q]

Never the same color?

Never TWICE the same color. NTSC.

At least that's how I heard it when I was in TV broadcasting. (It kinda earned its name, too.)

I also learned that SECAM stood for Something Essentially Contrary to the American Method (after all, it was French), and PAL was Peace At Last.