Mavic 2 Pro Vignette

[j.spar...@gmail.com]

Hello,

I'm having problems removing the vignette from the images taken with my Mavic 2 Pro in pano mode. I've tried the Optimize now! button in Exposure/HDR. It helped a lot but there's still an unacceptable vignette showing in the individual stitched images. Is there a way to manually control the Vignette curve? If there was a bit more reduction available I think I could solve the problem.
Thanks for any reply,
Jack

[j.spar...@gmail.com]

I'm attaching an image showing the issue.

[Erik Krause]

Am 25.08.2020 um 23:19 schrieb j.spar...@gmail.com:

> I'm attaching an image showing the issue.

It looks like the vignetting is more pronounced in the sky images. You
could try to load and stitch only the sky images, create a vignetting
curve for them and save it. Then use it on your complete panorama.

It could also be that the vignetting is not radially symmetric. I don't
think the Mavic camera has a slit shutter (which frequently causes this)
but some other obstruction might cause a light fall-off from one side to
the other. This can not be corrected with the PTGui vignetting correction.

An approach to correct for any type of vignetting is to use a vignetting
image with appropriate software. Astro imaging programs frequently use
this. See f.e. https://sites.google.com/site/sequatorglobal/manual for
details.

--
Erik Krause
http://www.erik-krause.de

[Jack Shaw]

Thank you for the reply, Erik.
I'll take a look at Sequator - thanks for the tip.

You wrote, "You could try to load and stitch only the sky images, create a vignetting curve for them and save it. Then use it on your complete panorama".

That's a great idea. Do you mean work with layers in Photoshop? I see the save button for the vignette curve but I haven't found a user manual to see how to use it once it's saved.

Could you point me in the right direction?

~ Jack

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[Roberto Posada]

Hola, tengo el mismo problema si uso los dng directamente en ptgui, pero el problema desaparece si proceso los dmg con lightroom y en ptgui uso tiff o jpg resultantes

[PTGui Support]

Hi Jack,

Are you using PTGui 11 or 12? It's a known issue in PTGui 12 for images
taken with the mavic 2 Pro.

Could I have your images? You can send them to support at ptgui dot com
via dropbox, wetransfer, etc.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[John Houghton]

On Tuesday, August 25, 2020 at 11:39:03 PM UTC+1, Jack Shaw wrote:

I see the save button for the vignette curve but I haven't found a user manual to see how to use it once it's saved. 

Could you point me in the right direction?d/msgid/ptgui/c26d2169-f55d-1f62-7ccc-8b35c1e8f9e9%40gmx.de.

Use the Load button to apply the saved vignette curve to the current project. The load button is on the left of the save button.

John 

[Jürgen Schrader]

it is surprising that the mavic has such a strong vignetting.
do you mind to show a single frame?

Am 25.08.2020 um 23:19 schrieb j.spar...@gmail.com:

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[Jack Shaw]

Hello Jürgen,

I've deleted the files. If you're interested I'll recreate the images.

Hi Joost,

You asked if I was using PTGui 11 or 12 and that it's a known issue in PTGui 12 for images taken with the mavic 2 Pro. I'm using PTGui Pro 11.28. I've found that if I take RAW pano images with the Mavic 2 Pro I'll get the vignetting. JPG images do not show vignetting. I would prefer to shoot in RAW. I may try creating an action in photoshop and apply to the RAW files but it's an extra step I'd like to avoid. 

Erik - I have a Mac so can't use Sequator. I'll search for something similar that will work on a Mac. If you happen to know of a Mac compatible program please let me know - Thanks!

Thank you all for the replies,

Jack

To view this discussion on the web visit https://groups.google.com/d/msgid/ptgui/925f8f2a-c851-2751-64ee-3380afd5c159%40bavaria360.de.

[Erik Krause]

Am 27.08.2020 um 18:13 schrieb Jack Shaw:
> I'll search for something
> similar that will work on a Mac. If you happen to know of a Mac compatible
> program please let me know - Thanks!

May be Starry Sky Stacker? Otherwise search for 'astro stacking mac' and
look for Flatfield correction.

--
Erik Krause

[Jack Shaw]

Thanks for the tip, Erik.
I may have found a way to fix the vignette in Photoshop.

-File

-Automate

-Lens Correction

-Then check, Vignette

-Browse and select all the images for the pano. The rest is self explanatory.

I've only done one test so far but it worked on the RAW (dng actually) images. Attached is the result - no other corrections have been made - yet. You can see a huge difference from the image I first posted.

Thanks again,

~ Jack

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[PTGui Support]

The Mavic 2 actually exhibits quite strong vignetting, but the DNG file
contains a lens correction profile which can nearly perfectly correct
this. Adobe Camera Raw can use this data, PTGui currently does not.

In theory PTGui's own algorithms should be able to correct the
vignetting too, but apparently it doesn't work sufficiently well. I'll
be looking into this.

Under strong vignetting, PTGui 11's blender will give a better result
because it mixes the contents from overlapping images, which somewhat
equalizes the light fall off. PTGui 12's blender does not use pixels
beyond the seam, so the vignetting remains more visible. I'm aware of
this. Remember that PTGui 12 is work in progress.

For now you'll get the best results by converting the DNGs to TIFF in
(e.g.) Photoshop and then dropping the TIFF files into PTGui 12.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

> <mailto:ptgui%2Bunsu...@googlegroups.com>.

> To view this discussion on the web visit
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[Conrad Allan]

Hey Joost,

Sorry to resurrect an old post. I was looking in the group for information on vignette removal as I'm having trouble and noticed your last comment mentioned v11 blends the vignetting between the seams but v12 does not (I've been using v12). Are you planning on re-introducing the seam blending for vignette removal in version 12 or something similar?

Thanks!

[PTGui Support]

Yes I'm considering adding the old blender as a backup option.

Nevertheless, the vignetting correction between in PTGui 12 has been
much improved between August and the latest beta.

If you're still having trouble with vignetting, could you make a set of
images available for download?

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 19/01/2021 08:36, Conrad Allan wrote:
> Hey Joost,
>
> Sorry to resurrect an old post. I was looking in the group for
> information on vignette removal as I'm having trouble and noticed your
> last comment mentioned v11 blends the vignetting between the seams but
> v12 does not (I've been using v12). Are you planning on re-introducing
> the seam blending for vignette removal in version 12 or something similar?
>
> Thanks!
>
> On Saturday, August 29, 2020 at 6:12:53 PM UTC+10 PTGui Support wrote:
>
> The Mavic 2 actually exhibits quite strong vignetting, but the DNG file
> contains a lens correction profile which can nearly perfectly correct
> this. Adobe Camera Raw can use this data, PTGui currently does not.
>
> In theory PTGui's own algorithms should be able to correct the
> vignetting too, but apparently it doesn't work sufficiently well. I'll
> be looking into this.
>
> Under strong vignetting, PTGui 11's blender will give a better result
> because it mixes the contents from overlapping images, which somewhat
> equalizes the light fall off. PTGui 12's blender does not use pixels
> beyond the seam, so the vignetting remains more visible. I'm aware of
> this. Remember that PTGui 12 is work in progress.
>
> For now you'll get the best results by converting the DNGs to TIFF in
> (e.g.) Photoshop and then dropping the TIFF files into PTGui 12.
>
> Kind regards,
>
> Joost Nieuwenhuijse

> www.ptgui.com <http://www.ptgui.com>

> <https://groups.google.com/d/msgid/ptgui/07aad1c2-f002-4a26-1270-a2f9faf00727%40gmx.de>.

>
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>
> >

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[Conrad Allan]

Okay great, thanks for the offer. I'll make another post in the group about my vignetting issues so that anyone looking in future can find information.

For anyone viewing this, here is my other post I've made: Vignetting/Blending issues with PTGui v12 Beta (google.com)

Thanks!

[Philip Chong]

I too have M2P and this problem every time, esp in clear blue sky!

I have success doing it on PS from above and I didn't know this. Thanks!

I will use it along with the Pro version to see which one is better.

Thanks!

[Florian Nagl]

I am also struggling with strong vignetting with my DJI Mini 2.

My usual workflow is to shoot in DNG, process (without vignetting correction, built-in lens profile applied) & export in LR to JPG, then stitch in PTGui. Post-processing before stitching however seem to heavily emphasize the vignetting.

I am not aware of a dedicated DJI Mini 2 lens profile in LR or a camera response curve in PTGui, would that help? Which order would you recommend for the best workflow?

Below a couple of tests, I've done the stitching with Default Settings (Exposure compensation, Find optimum seems, blend across seams: on).

Download original set of files here.

Thank you for suggestions!
Florian

[Philip Chong]

Don't you want to adjust the vignetting on each frame before you stitch?  Otherwise vignetting correction would only adjust the 4 corners of a stitched  panoramic photo  ?

[Erik Krause]

Am 22.01.21 um 16:48 schrieb Philip Chong:

> Don't you want to adjust the vignetting on each frame before you stitch?
> Otherwise vignetting correction would only adjust the 4 corners of a

> stitched*panoramic* photo

PTGui is pretty good at correcting vignetting from the images being
stitched, provided there is enough overlap.

But you're right. Correcting vignetting after stitching wouldn't be very
useful.

--
Erik Krause

[John Houghton]

On Fri, Jan 22, 2021 at 12:52 PM Florian Nagl <zigei...@gmail.com> wrote:

I am also struggling with strong vignetting with my DJI Mini 2.

My usual workflow is to shoot in DNG, process (without vignetting correction, built-in lens profile applied) & export in LR to JPG, then stitch in PTGui. Post-processing before stitching however seem to heavily emphasize the vignetting.

I am not aware of a dedicated DJI Mini 2 lens profile in LR or a camera response curve in PTGui, would that help? Which order would you recommend for the best workflow?

Below a couple of tests, I've done the stitching with Default Settings (Exposure compensation, Find optimum seems, blend across seams: on).

Florian, I had little success when using tiff images converted from DNG with three different converters.  They seem to have a magenta cast to the central area of the frame (clearly visible in your samples too).  The jpeg images straight from the camera don't suffer noticeably from this, so it's puzzling as to where the magenta cast is coming from.   Obviously, vignetting correction in PTGui doesn't take this into account.  Weird!

John

[Philip Chong]

I want to share my drone photo to test out this vignetting.

Mine is a Mavic 2 Pro.

Here are the files : https://we.tl/t-iA0PhIcBKK

[PTGui Support]

Hi Philip,

It's the same issue, the vignetting is in the form of a color cast.
PTGui cannot correct this, it can only fix vignetting by adjusting
brightness.

Apparently the camera is aware of the color cast, so it corrects this
when converting the raw data to jpeg.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

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[Erik Krause]

Am 25.01.21 um 10:49 schrieb PTGui Support:

> It's the same issue, the vignetting is in the form of a color cast.
> PTGui cannot correct this, it can only fix vignetting by adjusting
> brightness.

A pretty laborious way to fix this would be to determine the vignetting
for each color channel separately. This could be done by separating all
images into b/w representations of the respective channels, then use
PTGui to determine the vignetting for each channel. The resulting
vignetting curves could be used to correct for the color cast before
stitching.

However, since this kind of vignetting probably depends on several
factors it might not be worth the effort.

--
Erik Krause

[John Houghton]

Erik, I had already embarked on trying the method you describe of evaluating separate vignetting curves and I can confirm that it's a laborious process and doesn't work very well, and I only used a crop of 6 images.  The sky wasn't bad but the lower area was heavily and unevenly tinted.  I was not encouraged to do any more!

John 

[PTGui Support]

Does anyone have an explanation for this kind vignetting? AFAIK
vignetting is normally caused by partial occlusion of the light path,
which must be uniform for all colors.

It can probably be corrected by using different vignetting curves for
each channel (which PTGui currently doesn't support), but this requires
photos taken in a controlled environment, like a grey wall, to determine
them accurately.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

[Philip Chong]

I thought it has something to do with physics, that things at the corner are just not bright.

My Canon RF 24-240 lens have this problem, its dark at the 4 corners and PS fix it.

I will use PS to run this vignetting fix.  The Beta Pro does a good job too.

[Philip Chong]

It seems like the vignetting correction by Beta Pro makes the photo a little brighter than by PS.  I lost the sunset contrast/gradients, it becomes too bright.

[PTGui Support]

Hi Philip,

You can reduce the 'Exposure' slider in Panorama Editor -> Post Process.

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

> www.ptgui.com <http://www.ptgui.com>

>
> On 25/01/2021 16:03, Erik Krause wrote:
> > Am 25.01.21 um 10:49 schrieb PTGui Support:
> >> It's the same issue, the vignetting is in the form of a
> color cast.
> >> PTGui cannot correct this, it can only fix vignetting by
> adjusting
> >> brightness.
> >
> > A pretty laborious way to fix this would be to determine the
> vignetting
> > for each color channel separately. This could be done by
> separating all
> > images into b/w representations of the respective channels,
> then use
> > PTGui to determine the vignetting for each channel. The
> resulting
> > vignetting curves could be used to correct for the color cast
> before
> > stitching.
> >
> > However, since this kind of vignetting probably depends on
> several
> > factors it might not be worth the effort.
> >
> > --
> > Erik Krause
> >
>

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[PTGui Support]

I was referring to the images posted here:

https://groups.google.com/d/msgid/ptgui/16ddb0e8-c7a6-4e84-8cfb-d30dd3805aadn%40googlegroups.com?utm_medium=email&utm_source=footer

There's a color cast: reddish in the middle of the image, greenish on
the outside. It's physics for sure, but how exactly?

Kind regards,

Joost Nieuwenhuijse
www.ptgui.com

On 26/01/2021 03:34, Philip Chong wrote:
> I thought it has something to do with physics, that things at the corner
> are just not bright.
>
> My Canon RF 24-240 lens have this problem, its dark at the 4 corners and
> PS fix it.
>
> I will use PS to run this vignetting fix.  The Beta Pro does a good job too.
> On Monday, January 25, 2021 at 4:03:04 PM UTC-5 PTGui Support wrote:
>
> Does anyone have an explanation for this kind vignetting? AFAIK
> vignetting is normally caused by partial occlusion of the light path,
> which must be uniform for all colors.
>
> It can probably be corrected by using different vignetting curves for
> each channel (which PTGui currently doesn't support), but this requires
> photos taken in a controlled environment, like a grey wall, to
> determine
> them accurately.
>
> Kind regards,
>
> Joost Nieuwenhuijse

> www.ptgui.com <http://www.ptgui.com>

>
> On 25/01/2021 16:03, Erik Krause wrote:
> > Am 25.01.21 um 10:49 schrieb PTGui Support:
> >> It's the same issue, the vignetting is in the form of a color cast.
> >> PTGui cannot correct this, it can only fix vignetting by adjusting
> >> brightness.
> >
> > A pretty laborious way to fix this would be to determine the
> vignetting
> > for each color channel separately. This could be done by
> separating all
> > images into b/w representations of the respective channels, then use
> > PTGui to determine the vignetting for each channel. The resulting
> > vignetting curves could be used to correct for the color cast before
> > stitching.
> >
> > However, since this kind of vignetting probably depends on several
> > factors it might not be worth the effort.
> >
> > --
> > Erik Krause
> >
>

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[PTGui Support]

Here's a direct link (Florian's image):

https://18383391559893548525.googlegroups.com/attach/e7a80bf84680e/Preview%20DJI_0002%20Panorama%20from%20Original%20DJI%20Mini%202%20DNGs.jpg?part=0.1&view=1

[Erik Krause]

Am 26.01.21 um 09:48 schrieb PTGui Support:

> There's a color cast: reddish in the middle of the image, greenish on
> the outside. It's physics for sure, but how exactly?

Only a wild guess: Since color filters are a bit in front of the actual
sensor, light rays that don't hit the sensor perpendicular miss the
filter a bit.

On the other hand I saw this effect in blue-yellow on analog slides
taken with a cheap point and shoot camera in 1985.

And there is a similar known effect in infrared photography called hot
spot, which is commonly attributed to lens coating.

--
Erik Krause

[Erik Krause]

Am 26.01.2021 um 09:48 schrieb PTGui Support:
> There's a color cast: reddish in the middle of the image, greenish on
> the outside. It's physics for sure, but how exactly?

Ólafur Haraldsson does exceptional panoramas wit the Mavic 2 pro:
https://olihar.com/panorama/gigjokull-up-close-in-winter/?fbclid=IwAR2WZMzOXESfJab98fgvPTEN05S-xFaatJsD6iIKOVSzxOmHtbkXCwqq_F4

So it must be possible somehow.


--
Erik Krause
http://www.erik-krause.de