photodoc16

Ladies and Lads,
I shoot with a Canon 7D II. I have shot multiple exposures of 2 -3 exposures and have noticed that when I was shooting with JPEG and RAW, that the RAW image had a magenta hue. Now that I shoot only RAW, there is no JPEG available to see the image without this problem. Are there any ideas about why I am getting this discoloring and am I going to have to add a JPEG image to do multiples?
Thanks,
Photodoc16

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

With raw, you can easily correct the color. If you have a consistent color cast in all light, then there could be something out of whack. You can either use a camera color profile, or send it in for adjustment.

photodoc16

Gene51,
Any idea why this cast appears only with multiple exposures?
Thanks,
Photodoc16

Grahame Loc: Fiji

Can you clarify exactly what you are referring to as "multiple exposure"?

a) are you referring to a number of 'single' frames taken and each individually viewed in your Raw converter?

or

b) are you referring to a number of 'single' frames taken and stacked in camera using "multiple exposure" that produce 1 single frame that is then viewed in your Raw converter?

photodoc16

Grahame,
I guess it was confusing and I should be severely chastised for my lack of clarity.
I am talking about 2-3 (or more) exposures per frame.
Photodoc16

Grahame Loc: Fiji

Ok, thanks for that but it's still unclear.

When you are referring to "2-3 (or more) exposures per frame" am I correct in thinking you are doing this in camera and from the process producing one Raw file now, whereas before you were producing one Raw file and one jpeg. You were then comparing the Raw (rendered) with the jpeg in the same programme.

photodoc16

Exactly correct.
Photodoc16

Grahame Loc: Fiji

Thanks for that and apologies for the questions to clarify matters.

Over the past week I have been undertaking extensive trialling taking 'multi exposures' to investigate noise reduction for night photos (not sky). This has been done in camera using both the 'Additive' and 'Average' modes in my Nikons Multi Exposure process. I also came across a magenta hue in the stacked single output Raw file.

For some reason I still shoot raw + jpeg and on now comparing the stacked/merged camera output jpegs and raws the raws have the cast and the jpegs don't. I was able to visually WB adjust this magenta cast on the stacked camera output in ACR.

But, moving further on with my testing I was also shooting multiple same exposure Raws to stack in Photoshop Stack mode and started getting some more weird magenta and green hue areas and splodges in the final merged image easily seen in the plain sky areas. Remember these are 'dark' images at night.

I eventually found that the picture profiles affected this and suspect the WB setting as well. I went from an in camera 'Standard' profile with ACR 'Camera Standard' profile to an in camera 'Neutral' profile with ACR 'Adobe Neutral' profile to reduce the hues and splodge to a minimum. In addition I set a camera WB at 5000K no tint.

Why this improved things I do not know but I do recall reading something some time back that for any merging or stacking it's best to use a 'Neutral' profile.

The above may give you some clues or is something totally different, good luck.

photodoc16

Grahame,
Thanks for the info. In Elements, the ACR has no options for camera profiles so I will have to wait until I convert to PS and LR. In the meanwhile, I will use the RAW software from either DPP or Affinity to see what I can clean up. Good luck with your research. Stay safe.
Photodoc16

aellman Loc: Boston MA

You should be more chastised for not attaching a sample image so we could see the problem.

Grahame Loc: Fiji

But he gave a very understandable explanation of the "problem" ..........



......... and provided additional info and clarification when requested.


I'm sure that if a polite request had been made to the op with an explanation as to what information could be gathered from it he would also have obliged. You of course had that option but did not use it.