Changing Colour of Weird Artefact

[samamara]

Good evening, all; 

I created a time lapse video of the Milky Way rising and due to a known sensor issue for my camera, there is a yellow band across the clip. Normally, this is not so visible as to be disturbing, but due to the lighting of this particular clip, it's more prominent than I can live with, lol. In future, I may try to find a way to deal with this in Camera Raw unless it becomes easier to deal with in the final .mp4 as it's much less visible in a still image than in the shifting light and wispy clouds of the time lapse. 

Can anyone suggest for me a way I can try to remove this, or at least tone it down, in Premiere Pro? Initially I was thinking adjustment layer, isolating the band (very straight, horizontal), dropping the yellow colours but that's because that's what I would try in Photoshop, where I have more experience than in Premiere Pro. 

I am happy to try anything so if you have any ideas and a little guidance, I'd appreciate it! TIA!

samamara

[Ann Bens]

Screenshot would help!

[samamara]

Yes...sorry @Ann Bens - I forgot to add! Here's a shot and a small clip from the video. I'm hoping that there is some way to fix this or even, as I said, tone it down a bit. I think I could do it with time and patience in Photoshop but I'd rather do it at the end in Premiere Pro if possible.  Because it's an issue with the sensor (known and practically unsolvable without replacing the sensor and even then there are no guarantees), its location is contstant and linear. I hope I'm not asking for a miracle here. Any ideas?

[R Neil Haugen · Accepted solution]

I would put a mask around one of those areas so you get a better indication of the specific hue involved. Which is around as much green as yellow, I think.

Then use the Lumetri Curves tab Hue v Hue, and see if you can select an area and adjust the hue to reduce the visibility of the issue.

Might be able to use the eyedropper, but may need to make a manual selection. Click on the line either side of the expected color, drag the center of the selection up or down and watch your Vectorscope as much or more as the image.

Change the area selected and try again.

Neil

[samamara]

Thank you @R Neil Haugen! I will give that a try and let you know how it goes 🙂

[samamara]

Hello there @R Neil Haugen - thank you for your suggestion. I have given it a try and while it's a bit figety to pull/select the specific colours, and this is my first time trying this in Premiere Pro, but I believe it's going to work out with a bit more practice. I think doing this in Premiere Pro will be better than doing it in Photoshop since I already have enough edits syncing across 1400 images for the timelapse. Being able to do it on the final .mp4 I think will be easier and faster. Thanks again for this!

[samamara]

Sorry @R Neil Haugen - if I could just press you a little further please: I understand that I can add more than one mask (say if the left half of the photo shows the strip as a darker yellow/green due to the background and the right half shows it lighter), but how can I adjust it as the time in the clip moves on? Let's say it appears more saturated at 00:00:25:00 to 00:00:31:00 then it does on either side of those time stamps...how could I just affect that part of the clip? My limited knowledge of Premiere Pro makes me think I need to split the clip, but when I tried that it seemed that the mask I made just goes across both. Would adjustment layers over split clips help, or...? Again, any suggestions you ahve would be appreciated...thanks!

[Sami Succar]

Add a keyframe to the property that you're changing. It sounds like you're new to this, so I would suggest any quick YouTube tutorial on keyframing.

If you can share a screenshot of your whole Premiere window (showing the effects you're using and the timeline), I'll try to guide you through it.

[samamara]

Thanks a lot @Sami Succar - I appreciate that! Actually, I have already passed the PP exam, lol, but that is for very basic things and doesn't cover a lot about masks (and I'm pretty sure the scopes looked different when I saw them last 🤔). The keyframing I can handle. But the masking and getting rid this yellow/green line is a real challenge. Here are the screenshots you're asking for, though honestly they don't really show anything much. I've got the clip and the mask. I haven't tried anything further (I returned things back after I tried splitting the clip as I mentioned above). Any help or guidance you can offer would be appreciated! Thanks!

[Sami Succar · Accepted solution]

[samamara]

Thanks so much for this @Sami Succar - I will give it a go. I got a bit side tracked yesterday but today I can try these suggestions and see what works. Your .gif is really helpful...thanks!

[samamara]

So...do you mean put the mask on the clip and then whenever I notice that there is a shift in the tone of the line add a keyframe and then adjust the hue for that particular time in the clip? As I sort of hinted at above, I also notice that sometimes due to the light and clouds in the time lapse, it's a bit different on the right and the left as the MW sweeps across the frame. Would two masks across the yellow line rather than two also help there? This is a much bigger job than I was hoping for just to get rid of a little line 😢. But at least it's a chance to learn and practice something new. Again, any suggestions you have would be appreciated!

[R Neil Haugen]

Expand the Effects Control Panel window width by clicking on the little twirl-down arrown to the upper right of that panel. Just to the right of the clip name. That will open the keyframe part of the panel.

See the mask icons just below the Lumetri Effect name in the ECP? Use those to make your mask, and they will only affect that instance of the Lumetri effect.

Now twirl down the Lumetri effect tabs, and most of the controls have a stopwatch icon. Click that icon so it's blue, then it will adapt as you move through time.

So start by setting the controls to the first thing you want, then click the stopwatch to set keyfames 'on' for each control you'll change over time.

Move forward, when you need a change, stop ... make the change, it will add keyframes. Move on ... rinse & repeat.

Neil

[samamara]

Thanks @R Neil Haugen - I will work on that today and let you know how it goes. Fingers crossed!

[samamara]

Thanks so much again to both @R Neil Haugen and @Sami Succar - your tips have helped. It's a bit of a tricky go - especially with this particular time lapse as the 'lights' from the passing wisps of clouds affect the line differently throughout the clip - but it's definitely getting there with your guidance. As this is something that happens often (again due to a known issue with the sensor in my camera), I will have plenty of chance to get better but for now I can live with the result thanks to your help 🙂