HDR and purple cast in the sky advice

Daymouse

Daymouse

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Simon
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Im really into my hdr images at the moment (don’t worry not the over cooked kind) but on a couple of occasions ive had a problem with the sky. It seems to be when shooting with say a bright sky in the processing of the hdr the brightest part of the sky goes quite pixelated and gets a purple hue round it and I cant seem to get rid of it.

Can anyone advise what this is and how I can avoid it?
 
Sounds like the highlights are getting blown out and part of your work-flow is trying to restore the original rather than clipping to white? Photomatix is quite good at getting the settings for raw conversion right, but others like Luminance-HDR seem better fed with tiff's.
Probably need to see an example for any better diagnosis.
 
BethAtTheHug said:
Sounds like the highlights are getting blown out and part of your work-flow is trying to restore the original rather than clipping to white? Photomatix is quite good at getting the settings for raw conversion right, but others like Luminance-HDR seem better fed with tiff's.
Probably need to see an example for any better diagnosis.
Click to expand...

Thanks I'm actually using photo matrix but cannot get rid of it no matter what settings I try.

Will upload an example when I get home.
 
Last edited:
Heres an example in the sky, any ideas how this has been caused, how i can avoid in the future and anyway to fix this photo?

Cheers

8148391287_0cfa8292d5_c.jpg
 
Do any of the frames you shot have detail in that area of the sky? Or is it blown in all of them?
 
the strange ring shape it the sky is caused by the luminosity slider and edge definition, and or light smoothing, I would guess, its a magenta so you could turn that slide down for the cast, but first off try get rid of the ringing effect
 
That's the blown highlights problem. Have you looked at the highlights in the original raw files? It may be that you haven't actually got an image with the highlight in range... How many images did you take, what spread of exposure, and what is your work-flow?
 
Try the semi automated ghosting tool in Photomatrix. Just scroll around the problem area.
 
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