SL2 -S Colour shift

[Michael Markey]

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My SL2 -S with Panasonic 70 -200/4 kept throwing in the odd special effect on random frames this week .

Anybody any idea why this might be so ?

The lens has a UV filter .

Clearly a white balance issue although the setting remained as set and it doesn`t appear to have occurred on every frame .

Probably user error but I can`t think what or why .

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Edited October 28, 2021 by Michael Markey

[LocalHero1953]

Are these raw images, and can you correct the white balance and colour in post processing? 
Are you using Lightroom? What does it say the recorded WB is?
FWIW I haven't seen this.

[frame-it]

if shooting in A mode with AWB, once in a while the camera does take a little time to adjust if the light changes while re-framing...i never use AWB

[farnz]

Ah, you've left your sunglasses on again, Michael. 

Pete.

[hansvons]

I loaded the jpg in C1 but the colours are too off to bring back the picture to an acceptable look. 

I've never seen this before. I shoot exclusively on A mode but never use AWB. As @Frame Itpointed out:

8 hours ago, frame-it said:

once in a while the camera does take a little time to adjust if the light changes while re-framing

 that might be reason.  

I dislike AWB because, by definition, it's equalising the mood to something "right", which is to me rarely desirable. In the old days of film, film stock was either tungsten or daylight sensitive. In particular cool environments such as shadows in the early morning, we used a Wratten EF filter to bring down the blue colour temperature to something more realistic but maintaining the general mood, or used an 85 to convert colour temperatures from daylight to tungsten. Still, there was no such thing as WB. Controlling colour manually was part of the craft.

I still follow this philosophy and thus use for WB the camera's sunlight preset with its 5,5 K colour temperature because it's closest to what daylight film emulsions were sensitive to back in the day. Instead of using filters in front of the lens I adjust the DNG's WB to whatever I want later in post, but rarely/never use the WB Shot mode in C1 as a starting point as that uses the camera's AWB settings.

Hope you got a similar shot with the right colours.

[Michael Markey]

10 hours ago, LocalHero1953 said:

Are these raw images, and can you correct the white balance and colour in post processing? 
Are you using Lightroom? What does it say the recorded WB is?
FWIW I haven't seen this.

Yes on the RAW images but only on the odd frame .

I`ve always everything manually apart that is from the white balance which I leave on auto and adjust if required in post .

I use photoshop.

I did wonder if the conditions had anything to do with it  .... light drizzle but didn`t think so .

Wondered if anyone else had any ideas .

[Michael Markey]

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9 hours ago, farnz said:

Ah, you've left your sunglasses on again, Michael. 

Pete.

But I look so cool  😎

[Michael Markey]

57 minutes ago, hansvons said:

I loaded the jpg in C1 but the colours are too off to bring back the picture to an acceptable look. 

I've never seen this before. I shoot exclusively on A mode but never use AWB. As @Frame Itpointed out:

 that might be reason.  

I dislike AWB because, by definition, it's equalising the mood to something "right", which is to me rarely desirable. In the old days of film, film stock was either tungsten or daylight sensitive. In particular cool environments such as shadows in the early morning, we used a Wratten EF filter to bring down the blue colour temperature to something more realistic but maintaining the general mood, or used an 85 to convert colour temperatures from daylight to tungsten. Still, there was no such thing as WB. Controlling colour manually was part of the craft.

I still follow this philosophy and thus use for WB the camera's sunlight preset with its 5,5 K colour temperature because it's closest to what daylight film emulsions were sensitive to back in the day. Instead of using filters in front of the lens I adjust the DNG's WB to whatever I want later in post, but rarely/never use the WB Shot mode in C1 as a starting point as that uses the camera's AWB settings.

Hope you got a similar shot with the right colours.

Thank you that was useful.

That series of shots were all the same although I could recover them somewhat in photoshop.

I was curious as to why the Auto WB took the decision which it did .

Thinking back I did have the camera under my jacket prior to taking the shots (the rain had become slightly heavier).

As I said in a previous post its the only preset which I use but clearly I`m going to have to rethink that if there is a period of adjustment in certain lighting conditions 

[Simone_DF]

That looks like the Lomochrome Purple

https://shop.lomography.com/en/films/110-film/lomochrome-purple-film-110-5pack

[LocalHero1953]

AFAIK the WB set in camera or as AWB has no permanent effect on the raw file, so if this is just a WB issue then it should be fully correctable in post. You say that you could "recover them somewhat in photoshop" which suggest there may be something more at play than just WB.

I always use AWB in camera, unless I'm using flash, but I always check and adjust WB in Lightroom - I just use the AWB as a starting point.

[michali]

Michael- As much as I also think that it's probably an AWB issue,  I suggest that you try without the UV filter on & see if it repeats itself.

I recall reading that under certain lighting conditions UV filters can cause colour cast. Having said that, all of my lenses have B&W UV filters and I've never seen this before.

 

 

Edited October 29, 2021 by michali

[mike3996]

There's a minute chance it just might be a bug in your raw processor software.

I recently encountered a tough, similar discoloration in my Panasonic GX85 raw files and in that case it was a consistent problem where my raw developer happened to pick wrong black levels, affecting the white balance too. And it also was such a problem that I couldn't quite correct the problem just by adjusting WB. In the end it was a technical bug in black levels at raw level.

By no means am I suggesting that C1 or LR or whatever you happen to be using is suffering from a bug like this but it sure sounds similar issue to what I had in  darktable.

 

Unless you're willing to share two of your raw files with us, one with the color problem and one from the same series that has no such problem, we can't find things out for you.

Edit: I just reread the opening post and it was a Leica SL2S in question. I still stand my ground, the two brands share a lot of underlying tech even if one saves raw data in DNG and the other uses RW2 is it called?

Edited October 29, 2021 by mike3996

[Michael Markey]

Thanks again chaps .... I`ve had another fiddle in PShop and can correct the issue so fingers cross its a WB problem .

The fact that it was intermittent with the RAW file but then corrected itself suggests that it maybe the camera had a issue adjusting to the conditions .

Next time out though I will try it without the UV filter just to cover all the bases .

Thank you again for the advice and suggestions 

[BernardC]

1 hour ago, mike3996 said:

There's a minute chance it just might be a bug in your raw processor software.

I don't know if there's a CaptureOne trial that you can download. Raw Therapy and Darktable are both free (in both meanings of the term).

I've never tried it, but Photopea offers an online raw processor. You can try uploading your DNG there to see if it still looks strange.

[Michael Markey]

2 hours ago, BernardC said:

I don't know if there's a CaptureOne trial that you can download. Raw Therapy and Darktable are both free (in both meanings of the term).

I've never tried it, but Photopea offers an online raw processor. You can try uploading your DNG there to see if it still looks strange.

Thank you ...

Loaded the RAW file into Photopea and its got the same problems .

The temp is 4730 but the tint is way over at 130 .

Its adjustable of course but the answer as to why might be an adjustment issue .

I`ll need to take it out again and confirm .

Edited October 29, 2021 by Michael Markey

[BernardC]

52 minutes ago, Michael Markey said:

The temp is 4730 but the tint is way over at 130 .

Its adjustable of course but the answer as to why might be an adjustment issue .

Now you know it's a camera issue.

You should contact Leica support, it's probably a bug. The tint should never be that high in a daylight shot (it's meant to compensate for green/magenta shifts with cheap fluorescent or LED lights).

[hansvons]

42 minutes ago, BernardC said:

The tint should never be that high in a daylight shot (it's meant to compensate for green/magenta shifts with cheap fluorescent or LED lights).

True. It also "corrects" other coloured light issues such as green reflections from foliage or the slight green tinting of outside daylight that all window glass to some extent in day interior shoots.

[2M6TTLs]

Just take lots of Halloween photos while you're enjoying the free special effect!