"RED" dark frames

Started 2 months ago | Questions thread
EricTheAstroJunkie Contributing Member • Posts: 821
Re: Yes it's white balance

sharkmelley wrote:

EricTheAstroJunkie wrote:

This has nothing to do with white balance, this is purely the result of amp glow and sensor read noise which you see from image stretching.

On the contrary, it's the white balance.

For instance the (R,G,B) daylight multipliers for my Nikon Z6 are (1.75, 1.0, 1.34) which boosts the red and blue channels. So when this white balance is applied to a bias-subtracted debayered dark frame then of course it will look reddish purple.

If I open one of my dark raws in Photoshop, pushing the exposure, then they look purple just like Affinity Photo is also doing.

Mark

So if they set the white balance to tungsten the frame will be blue? I haven't ever seen a white balance affect the dark frame in such a manner, guess it would be easy to test, take a bunch of dark frames with various white balances and see what happens.

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