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Staff room

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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 Wink

Camera:Canon EOS 400D
Lens:Sigma 10-20mm EX
Recording media:RAW (digital)
Title:Staff room
Username:summ3r summ3r
Uploaded:20 Jul 2008 - 8:33 PM
Tags:Digitally manipulated, General, Hdr
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Comments

This photo is here for critique. Please only comment constructively and with suggestions on how to improve it.
banehawi
banehawi Critique Team 10781 forum postsbanehawi vcard Canada2800 Constructive Critique Points
20 Jul 2008 - 8:55 PM

Looks like noise in V2, - what ISO did you use?

W

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Strobe
Strobe  61254 forum posts United States
20 Jul 2008 - 8:56 PM

It is difficult to fault this, I like the way you have used the 10-20, the colours and saturation are excellent and it complements the style of the room.
Marc

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crazycucumber
20 Jul 2008 - 9:06 PM

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.

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Alex_M
Alex_M  755 forum posts Scotland2 Constructive Critique Points
20 Jul 2008 - 10:50 PM

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

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cameracat
cameracat  108578 forum posts Norfolk Island61 Constructive Critique Points
20 Jul 2008 - 11:37 PMConstructive Critique!This comment was flagged as constructive critique! 

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.......Smile

Experiment in HDR is the way.......Well thats my take on it....!

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dexthersj41
21 Jul 2008 - 7:37 AM

Great shot! amazing how you managed to get a great pic from an every day subject!!
Aadrian.

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kalseru
kalseru e2 Member 7kalseru vcard England9 Constructive Critique Points
21 Jul 2008 - 9:14 AM

There two types of artefact created in the tone mapping process, the first one is noise but this usually occurs in the shadows itís 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

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summ3r
summ3r  726 forum posts United Kingdom1 Constructive Critique Points
21 Jul 2008 - 10:37 PM

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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