Olympus UK E-System User Group
Olympus UK E-System User Group

Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


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Looking for improvement This is the e-group critique board. If you post a picture here it will be assumed that you are looking for comprehensive technical feedback - both good and bad, but always respectful. Only post pictures here if you can deal with potentially negative constructive criticism. Anyone is qualified to comment and post feedback, and everyone is encouraged to do so. NB: "Looking for Improvement" is the place to post any pictures you would like advice on improving, no matter how bad you might think they are.

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Old 11th April 2018
RobEW RobEW is offline
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Green cast on interior stonework

I spent a happy day in our local Anglican cathedral, Southwell Minster, yesterday, taking photos. Tried out the HiRes feature of the E-M5 II for the first time in earnest. (Does it produce only JPEGs?)

I didn't take any flash as I fired that architecture doesn't move and I have a tripod so long exposures are possible. Anyway some of my photos of stonework have a very marked and unpleasant green cast. I'll try and attach a couple. (A larger selection are available at https://www.flickr.com/photos/148582...57695527038785 )

I'm not sure whether it was caused by light coming in through stained glass, or by some out of shot bright lights installed to illuminate an art display, or by some mistaken setting on my camera. Any ideas? I'd be very grateful.

P.S. Can't get attaching to work.
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Old 11th April 2018
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Re: Green cast on interior stonework

It'll do raw too, but you need to go into the SCP (or the menus) to turn it on. When you switch to HiRes, it annoyingly defaults to JPEG only.

Green cast is probably a WB issue. Shooting raw will fix it
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Old 11th April 2018
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Re: Green cast on interior stonework

Whenever I perceive a green cast, I consider it likely to have come from fluorescent lights. I tend to have my camera set to 6500K (for the studio) so will often have to correct the RAW file. I find this easier than trying to work out what AWB has done.

I'm always amazed by the way our brain "sorts out" colour casts and it's only when I look at an image that I see how different the light colour really was.
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Old 11th April 2018
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Re: Green cast on interior stonework

I agree that it was most likely the overhead flourescent lighting. Shoot RAW and use use the white balance tool on OV3 or use something like photoshop that can adjust white balance or colour cast on jpegs. Even my lowly Photoshop Elements 12 can do this.
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Old 11th April 2018
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Re: Green cast on interior stonework

Interior shots of places with stained glass, tube lighting and strongly coloured paint on the walls can sometimes catch out even Olympus' usually excellent AutoWB. I usually carry a trio of white/grey/black credit-card sized colour cards when I know I'm going to be going that and take a few shots of them in various parts of the space.

Mixed lighting is even worse, although the latest version of Capture One has got fantastic colour correction masking that gives you an even chance of sorting out even that (or, at least getting very close).
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Old 11th April 2018
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Re: Green cast on interior stonework

thanks, you helpful, knowledgeable lot.

I've thus far never felt the need for those grey and white and black cards, but this was a learning experience. Would it be a close enough approximation to use my LowePro camera bag (black on the outside, grey inside) to get a white balance?

(ETA: Just remembered - I have a nice button to do auto WB on the front of E-M1. Slightly different method needed on E-M5 II. But in any case, now I know how to force it to shoot in RAW I can correct later).
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Old 11th April 2018
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Re: Green cast on interior stonework

I presume you mean like this shot

P4100028_DxO by Rob EW, on Flickr

Copy the BB code and paste it into the thread.
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Old 11th April 2018
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Re: Green cast on interior stonework

Yes - thanks for posting. How do I find a "BB code"?

(The photo of the pulpit also has green highlights)
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Old 11th April 2018
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Re: Green cast on interior stonework

I did try looking to see if there was a sticky posting somewhere on this site explaining how to attach or include photos. Maybe most existing members don't need it ...
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Old 11th April 2018
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Re: Green cast on interior stonework

Quote:
Originally Posted by RobEW View Post
I did try looking to see if there was a sticky posting somewhere on this site explaining how to attach or include photos. Maybe most existing members don't need it ...
When on Flickr, go to the picture you want to post here. Then click on the upturned arrow within the black picture box (hovering over it will show the phrase 'Share Photo'). Click on that arrow and you will see a box which has 'Share', 'Embed', 'Email', 'BB Code'. Click on BBcode and you will see a line of code on a blue background and underneath that a strip with a drop down arrow. On that second box, click on the arrow and select the size you require (probably 800x??? or ???x800 for now). once selected, go to the upper line and copy the newly sized code with the blue background.

Paste that code into the reply box in this forum and then delete everything before [img] and after the second [img]

Submit your reply

Hope that helps

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Old 11th April 2018
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Re: Green cast on interior stonework



Bingo (As regards including images)

The green reflections really spoil this image. :-(
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Old 11th April 2018
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Re: Green cast on interior stonework

Don't think that is a colour cast - looks more like an interference pattern. Maybe a side effect of the HiRes jpeg.

You could clean it up a bit in Photoshop, a very quick attempt:

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Re: Green cast on interior stonework

More thoughtful edit



In photoshop - duplicate the layer - blur it - change blend mode to colour - add black mask - paint white brush on mask where want to remove cast. Blur size is by trail and error
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Old 11th April 2018
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Re: Green cast on interior stonework

I've just tried a few photos at home with the same camera, and compared the colours of the same shot taken with and without Hi res, and the colours seem identical. So if the green tinges is diffraction caused by Hi res, then there must be other factors at work which occurred in the Minster but not in my home.
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Old 11th April 2018
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Re: Green cast on interior stonework

Brilliant work in Photoshop @Invicta.
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