Lauchlan Toal Offline Upload & Sell: Off
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It's the pixel receptors overflowing (really rough analogy and imprecise language, sorry).
But basically the sky is exceptionally bright, much brighter than pure white. It looks no different to us than barely pure white, but it bleeds into nearby pixels because it's just so bright.
If you expose it right at rgb 255,255,255 you won't get any of this bleed, but if you then expose it more than that you'll still get the same rgb 255,255,255 on the sky since it can't get brighter than pure white, but all that extra light will affect nearby pixels.
This is why commercial photographers shooting things against white backdrops tend to underexpose the backdrop a tiny bit, to say 250,250,250, and then boost it in post a little. Otherwise you risk getting artefacts like this.
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