GoPro Hero 6 'Wide' lens profile changing Exposure/Contrast ?

GerryQ

Member Joined: Aug 26, 2015 14:43 Messages: 63 Offline

Solved by

Jun 15, 2018 07:43

I often edit videos shot using GoPro cameras. I've done this for years.
I've had many early versions of PD and used many GoPro's.

I'm currently using PD15 - May 2018 patch installed.
I'm currently using a GoPro Hero 6.

Now call me a heathen, but I've never before used lens correction - I didn't worry about the GoPro view of the world being slightly distorted. It is still a cracking action camera.

So just to see what lens correction would look like, I tried playing with the downloaded profile.
Hero 6 'Wide', and just for fun, I downloaded all other Hero profiles...
(Well, I've got the 4K camera, the uber-computer to play with 4K and a 4K telly - so why not produce like a 'pro' ?)

I noticed that as soon as I used the 'wide' profile (And any other GoPro for that matter), then the sky was suddenly 'Washed Out' - The clouds vanished in a blur of white...
Now they weren't so prominent anyway, but I prefered the exposure/contrast before appying the lens correction profile.
I hadn't expected the exposure/contrast to change at all ! ? !

I had noticed that some time ago - before the Hero 6 'Wide' profile was available - that another user had recommended using the Rollei 7S profile for the Hero 6...
So I gave this a bash...
OK - So the mapping is a little different, but the Rollei lens profile didn't wash out the sky at all.
It seemed an imperfect lens correction - but the clouds remained intact.

2 attached photos show the difference (Top Left)

So - What am I missing here ?
What am I doing wrong ?
Why do I prefer the footage using the Rollei 7S profile instead of the 'Correct' Hero 6 wide profile ?

Anyone else noticed this ?

Cheers for reading - sorry it's long !

Gerry


Filename	LensProfileHero6Wide.jpg	Download
Description	Hero 6 'Wide' lens profile
Filesize	545 Kbytes
Downloaded:	10 time(s)


Filename	LensProfileRollei7S.jpg	Download
Description	Rollei 7S lens profile
Filesize	563 Kbytes
Downloaded:	4 time(s)

James Dotson

Senior Contributor Location: Tennessee Joined: Aug 24, 2009 20:40 Messages: 3066 Offline

Jun 18, 2018 03:29

To clarify, did the change happen when you changed a setting on the camera or when you made corrections in the software? What settings are you using to compare? __________________________________
CORNBLOSSOM

ynotfish

Senior Contributor Location: N.S.W. Australia Joined: May 08, 2009 02:06 Messages: 9977 Offline

Jun 18, 2018 06:43

Hi GerryQ & James -

Gerry, I'm sure it's nothing you're missing or doing wrongly. I don't think that particular profile is built well at all. The same sort of thing happens with the GoPro Hero5 Black (Wide) profile. Lighter areas get blown out.

There's no reason a lens correction profile should be messing with colour like that.

Stick with a profile that does the job, I'd say.

Cheers - Tony
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tomasc

Senior Contributor Joined: Aug 25, 2011 12:33 Messages: 6464 Offline

Jun 19, 2018 01:48

You can do the lens correction manually yourself in post. Apparently, the author of that particular GoPro profile may have applied too much vignette removal to compensate for less exposure at the edges at full aperture. If you feel that this is not the case then you may want to report this to Cyberlink support.

GerryQ

Member Joined: Aug 26, 2015 14:43 Messages: 63 Offline

Jun 20, 2018 05:19

Quote To clarify, did the change happen when you changed a setting on the camera or when you made corrections in the software? What settings are you using to compare?

The difference happened in editing - the camera work was all finished...
I was working with the same clip in PD15...
I was wondering why the lens correction profile for the GoPro Hero 6 wide (The correct one for my camera) seemed to bleach out the sky, but the lens correction profile for the Rollei 7S didn't...
???

GerryQ

Member Joined: Aug 26, 2015 14:43 Messages: 63 Offline

Jun 20, 2018 05:26

Quote Hi GerryQ & James -

Gerry, I'm sure it's nothing you're missing or doing wrongly. I don't think that particular profile is built well at all. The same sort of thing happens with the GoPro Hero5 Black (Wide) profile. Lighter areas get blown out.

There's no reason a lens correction profile should be messing with colour like that.

Stick with a profile that does the job, I'd say.

Cheers - Tony

Hi Tony,
Many thanks for your reply.
This was my first attempt at lens correction.
I admit I was playing with a feature - 'Because it was there' .
I noticed a similar effect with the GoPro 5 profile, and other profiles - I tried them all !
I can't remember when I saw the comment re the Rollei 7S profile working with the Hero 6, but I can say I thought it was my favourite !
I'm going to use this for a while in editing my gravity racing clips - At least the start line looks straight (ish) as compared to a smiley face without any lens correction.

This message was edited 1 time. Last update was at Jun 20. 2018 05:28

GerryQ

Member Joined: Aug 26, 2015 14:43 Messages: 63 Offline

Jun 20, 2018 05:37

Quote You can do the lens correction manually yourself in post. Apparently, the author of that particular GoPro profile may have applied too much vignette removal to compensate for less exposure at the edges at full aperture. If you feel that this is not the case then you may want to report this to Cyberlink support.

Hi Tomasc,
YES ! - Many thanks for your reply.
I now understand why you could get a bleached out circle appearing around the periphery of a lens correction profile...
Shame that the Hero 6 doesn't really suffer that badly from vignetting and under exposure around it's edges - Well, not in my admittedly limited use of it (Only had since Christmas).
So it may be that the Rollei 7S profile has a similar mapping for a similar focal length lens - but has less vignetting correction applied - hence my preference.
Many thanks Tomasc - I hadn't thought of any reason to mess around with exposure, but reading your comment, I can see why it could happen.
Gerry