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At work we are going to be undergoing major refurbishment so I decided that as well as providing a bit of a record (.....when I was a girl it looked like this!) it would also be an excellent opportunity to practise my HDR technique.
This shot is a merge of 3 shots at F16 1/250, 1/10 and 0"5 using Photomatix pro.
I like how its turned out but there seemed to be a lot of artefacts in the highlights, to counter this I made a new layer put a gaussian blur on it & used a mask to blur the worst of the artefacts.
What I want to know is can I prevent these artefacts from occuring maybe if I were to extend the range of shutter speeds? Maybe I need another exposure purely metered on these highlights?
Thank you for looking and for any help you can give me with this.
I have added a crop of the original showing the artifacts in the versions 
| Camera: | Canon EOS 400D |
| Lens: | Sigma 10-20mm EX |
| Recording media: | RAW (digital) |
| Title: | Staff room |
| Username: | 
summ3r |
| Uploaded: | 20 Jul 2008 - 8:33 PM |
| Tags: | Digitally manipulated, General, Hdr |
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Comments
the full shot looks like you look out onto deep blue sea ! , second shot confims its not ! lol . nice HDR , sorry cant help with the artefact stuff.
Never used Photomatix so not sure what it is doing to the closeup, but can get the same effect in photoshop using the noise filter, so looks like it has added noise to the yellows or overcooked them, but it is a good pic so worth playing around with it a little more
well done
Alex
A good HDR job, As for the artifacts, Mmmm Could be several reasons, Exposure is one for sure, The other might be choice of ISO.
A high ISO will produce this effect....!
I'm curious about your choice of aperture too....! You might find that ISO100 and aperture at f8 a better choice, Then set your camera up to bracket the shots at your chosen exposure variations...! ie: + 0 - etc etc.
If you can do a 5 frame bracket sequence, This gives you a little more scope in Photomatix Pro, You can also try combing some of the straight frames with the resultant HDR output, That can produce good results, In certain situations, Not gauranteed mind, But worth trying.......
Experiment in HDR is the way.......Well thats my take on it....!
Great shot! amazing how you managed to get a great pic from an every day subject!!
Aadrian.
There two types of artefact created in the tone mapping process, the first one is noise but this usually occurs in the shadows it’s a by product of digital cameras but tone mapping exaggerates it. The other problem is grain which is usually apparent in lighter areas like your sky. Grain is caused by too much local compression and so can be reduced by trying the following adjustments in Photomatix :-
Reduce the STRENGTH
Reduce LUMINOSITY
Increase MICRO-SMOOTHING
Reduce MICRO-CONTRAST
Hope this helps.
Andy
Many thanks to you all for your input I did use ISO 100 so I dont think that the ordinary digital noise is the problem.
I didnt think about combining the straight frames with the HDR I will certainly give that a try thanks Vince and thanks Andy I will give that a go too.
Thank you all for commenting
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