Anyone tried the Tiffen Chormatic Aberrations removal?
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unTripp have you got a couple of grabs where its an issue you can post up? Maybe theres a simple 'try shooting it this way' that will help reduce overall CA.
Noel, all Canon footage features this issue, just go and watch for yourself.
CA is a common issue on Canon lenses.
When i purchased the XH A1 i already knew this issue. Now i'm just looking around to find eventually something that could minimize the problem.
Which is exactly why Id like to see the grabs and make possible suggestions.
All low end lens suffers from this effect, not just Canons. The HVX have it, FX1, Z1U etc. Even the lower cost lenses on the HPX500 have it, that's why Panasonic developed CAC lenses. It's unnoticable most of the time by the general audience. If you're interested in seeing what the problem looks like, this article has some good examples
http://www.dvxuser.com/V6/showthread.php?t=108883
http://www.dvxuser.com/V6/showthread.php?t=108883
unTripp
Active member
Noel,
I can, but it will have to wait until tomorrow when back at my desk.
I've complained, although not too loudly, about the CA in the A1. Someone told me that it's an issue with the HDV codec, although I think the lens a more likely culprit.
If it's worth anything, I was editing some HDV footage taken with an HV10 and it suffers from much worse CA than the A1.
Back on point, I'm interested in anything that can remove or reduce it. Photoshop's Camera Raw has a tool to reduce CA. It seems logical that there's a tool somewhere that can reduce it through the lens or in post.
I can, but it will have to wait until tomorrow when back at my desk.
I've complained, although not too loudly, about the CA in the A1. Someone told me that it's an issue with the HDV codec, although I think the lens a more likely culprit.
If it's worth anything, I was editing some HDV footage taken with an HV10 and it suffers from much worse CA than the A1.
Back on point, I'm interested in anything that can remove or reduce it. Photoshop's Camera Raw has a tool to reduce CA. It seems logical that there's a tool somewhere that can reduce it through the lens or in post.
Most likely there is, but how effective I am not sure. Dont worry my firend I know the A1 has CA and its nothing to do with the codec.
But, again my point is there are many times by making a slight adjustment it can be reduced or in some cases removed before the shot. So when you post the shot, lets look at what we can do.
But, again my point is there are many times by making a slight adjustment it can be reduced or in some cases removed before the shot. So when you post the shot, lets look at what we can do.
Lots of equipment buying mistakes have been made because someone said something about a camcorder without any evidence and people took it as fact. Without framegrabs from those specific camcorders we might be led to assume that the problem is more serious than it actually is, and that would be unfortunate.
Theoretically, we know all lenses must have some CA, but we'd like to see what it actually looks like on the XH A1 (and the HV10) because it might not be as serious as it sounds when you use words rather than pictures. It is also possible that a serious artifact that looks like CA is actually something else.
So, supposed that we still want to stay on topic, does anybody tried any FCP plugin to remove CA?
Yes, it could be done in Photoshop, but i really don't know what happens if you break the HDV Long GOP codec into single frames for Photoshop and then you rebuild the movie. I suppose it would lose a lot of quality. Or not?
So again Anybody tried the Tiffen plugin?
Thanks again.
Yes, it could be done in Photoshop, but i really don't know what happens if you break the HDV Long GOP codec into single frames for Photoshop and then you rebuild the movie. I suppose it would lose a lot of quality. Or not?
So again Anybody tried the Tiffen plugin?
Thanks again.
Ok, i found a DIY system to remove CA in FCP without special plugins.
You can see the examples:
original
corrected
Here the very simple workflow:
In Final Cut Pro i put the same footage on 4 tracks.
Track 1 only shows the R channel
Track 2 only shows the G channel
Track 3 only shows the B channel
(to achieve this i use the FCP plugin "RGB balance"
Track 4 has the original footage
On track 4 i crop the left and right by a value of 20 and set edge feather to it's maximum.
Now, on track 1 (R channel) i just set the zoom factor to 100.2.
The CA is almost gone, the corrected areas are slightly smoother.
This method is particularly useful for people using 35mm adapters as they never change the zoom ratio of the camera.
You can see the examples:
original
corrected
Here the very simple workflow:
In Final Cut Pro i put the same footage on 4 tracks.
Track 1 only shows the R channel
Track 2 only shows the G channel
Track 3 only shows the B channel
(to achieve this i use the FCP plugin "RGB balance"
Track 4 has the original footage
On track 4 i crop the left and right by a value of 20 and set edge feather to it's maximum.
Now, on track 1 (R channel) i just set the zoom factor to 100.2.
The CA is almost gone, the corrected areas are slightly smoother.
This method is particularly useful for people using 35mm adapters as they never change the zoom ratio of the camera.
Last edited:
unTripp
Active member
CA images
CA images
OK, I pulled out five images from some recently shot footage as some of the worst CA examples I've seen. These are straight out of the camera with no retouching. NOTE: The images are full res and about 5MB. You might want to right click and download instead of viewing in the browser.
The following were shot using the A1's default custom preset
www.coveredbridgeproductions.com/images/tree.tif
www.coveredbridgeproductions.com/images/tree3.tif
The next two used the "VIVIDRGB" setting
www.coveredbridgeproductions.com/images/badtree1.tif
www.coveredbridgeproductions.com/images/snow1.tif
It appears to my eyes that the CA is much worse here, particularly on the left side.
The final image also uses "VIVIDRGB"
www.coveredbridgeproductions.com/images/branch1.tif
What's interesting about this one is that it appears near the center of the image around the snow in the tree branch. This problem may be a combination of the VIVIDRGB setting and the fact that the color balance is off. However, with VIVIDRGB, I notice that it wants to turn the snow either slightly red or slightly cyan. This could be because I'm getting small amounts of CA around the edges of the snow detail and the VIVIDRGB setting is exacerbating it.
As an aside, I noticed some wicked bad CA on a couple of shots in an episode of "Dr. Danger" broadcast recently on Mojo. I'm pretty sure it was taken with a Sony HDV cam, but I'm not certain. After seeing this, I know this problem could be a lot worse.
CA images
OK, I pulled out five images from some recently shot footage as some of the worst CA examples I've seen. These are straight out of the camera with no retouching. NOTE: The images are full res and about 5MB. You might want to right click and download instead of viewing in the browser.
The following were shot using the A1's default custom preset
www.coveredbridgeproductions.com/images/tree.tif
www.coveredbridgeproductions.com/images/tree3.tif
The next two used the "VIVIDRGB" setting
www.coveredbridgeproductions.com/images/badtree1.tif
www.coveredbridgeproductions.com/images/snow1.tif
It appears to my eyes that the CA is much worse here, particularly on the left side.
The final image also uses "VIVIDRGB"
www.coveredbridgeproductions.com/images/branch1.tif
What's interesting about this one is that it appears near the center of the image around the snow in the tree branch. This problem may be a combination of the VIVIDRGB setting and the fact that the color balance is off. However, with VIVIDRGB, I notice that it wants to turn the snow either slightly red or slightly cyan. This could be because I'm getting small amounts of CA around the edges of the snow detail and the VIVIDRGB setting is exacerbating it.
As an aside, I noticed some wicked bad CA on a couple of shots in an episode of "Dr. Danger" broadcast recently on Mojo. I'm pretty sure it was taken with a Sony HDV cam, but I'm not certain. After seeing this, I know this problem could be a lot worse.
someday.. this is something I intend to do for our feature, shooting with brevis to xh-a1. I tested a similar correction before, but I used after effects and applied a Lens Correction to each channel (by duping the layer for each channel, showing one colour only, then fx, then 'add' together the layers with blend type). I also corrected it almost entirely. Interesting that you did it with simple scale, I'll try that.
unTripp these images really are worst case scenario for the A1 - very high contrast - snow. THe natural enemy.
Heres where you can help yourself. The A1 is an excellent camera for retain shadow detail - or detail in the darks.
You are a little too hot on these shots to begin with. So to help reduce overall CA when dealing with such high contrast like snow, stop it down a bit so your are about 1/2 stop to one stop under exposed. These is easy to bring up in post again whilst retaining the detail. Then you can rely less on filters.
Someday not sure if that shot is yours or not either - but that could also easily be reduced doing same thing.
Heres where you can help yourself. The A1 is an excellent camera for retain shadow detail - or detail in the darks.
You are a little too hot on these shots to begin with. So to help reduce overall CA when dealing with such high contrast like snow, stop it down a bit so your are about 1/2 stop to one stop under exposed. These is easy to bring up in post again whilst retaining the detail. Then you can rely less on filters.
Someday not sure if that shot is yours or not either - but that could also easily be reduced doing same thing.