dvx 200 moire on product shots

C

cio

New member
Hi all

Recently purchased a DVX 200 and would like to use on some product shots of attaché cases presentation folders / laptop carriers etc .

We did a test shoot last week and some of the products are 'textured' and this texture is 'creating' some moire when shot.

Any tips for reducing or losing this please? I can could also use our sony z1 / z5s for the shoot - test shooting with those tomorrow.

Any advice more than welcome.

Many thanks
Gav
 
You were shooting in 4K ?

If so, does the 4K image show moire when you look at it in 1:1 pixel mode ? ( i.e. full resolution of the 4K image )
 
cio said:
Hi all

Recently purchased a DVX 200 and would like to use on some product shots of attaché cases presentation folders / laptop carriers etc .

We did a test shoot last week and some of the products are 'textured' and this texture is 'creating' some moire when shot.
Click to expand...
Could you share a TIFF example in full resolution?
 
Hi

I was shooting at 1080 (full hd)
I will share a screen grab - shortly - will do some more tests tomorrow.

Thanks for your help so far ;)
 
Best advice? Don't use 1080. 1080 mode on a DVX200 uses pixel mixing techniques that make it more susceptible to moire. UHD or 4k should be.much cleaner.

If you really must shoot 1080 (client requires a 1080 deliverable, for example) try using Dual Codec. Choose UHD for the main recording, and FHD 1080 50mbps for the dual codec. That 50mbps 1080 recording should be cleaner and sharper than normal 1080 mode. Plus, hey, you'll also have a UHD version if they ever need or want it.
 
cio said:
I was shooting at 1080 (full hd)
Click to expand...

For the past 2+ years, I shot everything in 4K with my GH4 to avoid moire. This meant downscaling my 4K image to 1080p using the free GoPro Cineform CODEC, as it is one of the few CODECs that can properly scale 4K down to 1080 without inducing moire into the finished image. ( it also converts the 4K 4:2:0 color-space to 1080p 4:4:4 color-space )

I haven't shot with the DVX200, but I've always thought that the DVX200 has the same type of moire problems that the GH4 camera has when shooting in HD mode. This has changed with the GH5, which can finally shoot native 1080p footage without the same GH4 moire problems.
 
Update on this:

Moire still there when shot at 4K and when subsequently downscaled to 1080

When shot on a sony z5 it is not there!

Image attached (zip file) of the original clip showing the extent.

Really just trying to gauge if this can be negated on the DVX 200 or if we should use the z 5 for those products.


Further advice welcomed - and thanks ;)
 

Attachments

cio said:
UImage attached (zip file) of the original clip showing the extent.
Click to expand...

Can you post a full resolution 4K frame as either PNG or TIF file. ( there should be no moire visible in the 4K frame )

I want to see if my normal downscaling technique can produce a clean 1080p image from the 4K frame.
( shooting 4K for 2+ years on my GH4 and I've never had moire, and never seen moire in my downscaled 1080p footage )
 
re full HD image - there is a limit to the file size I can attach include here- tif is over it I expect the png maybe also.

messaged you with my email addy - I can then send it on.
 
cio said:
re full HD image - there is a limit to the file size I can attach include here- tif is over it I expect the png maybe also.
Click to expand...

To share larger files I use a free Google Drive account which gives you up to 15 GB of free file-sharing space. ( just make sure you change the "sharing" for the file to "anyone with the link" )
 
I think this is a visual interference
This is like where we are filming an LCD monitor
The two textures are caused
The camera chip and the bag textil
It's a little bit to change the focus
 
TL;DR: try Neat Video

You're gonna get moire. Except on very expensive cameras (or film ones), moire is going to present itself quite often. The cheaper the camera, the more moire, aliasing, and other artifacts will present more often. And those big expensive cameras? Arri, Varicam, CineAlta, and Red, all will exhibit artifacting at some point somewhere.

DSLR's (and some other interchangeable-lens cameras) can use a VAF filter by Mosaic Engineering. Sometimes you just have to be clever and shoot differently. Maybe instruct the talent not to wear a shirt with pinstripes. Et cetera. Other times you simply have to roll with the punches and shoot the product with the moire painfully present.

Renting a Red Weapon Helium and Cooke lenses isn't an option here, so I'd have to suggest a software solution. Blurring the footage slightly (selectively) might also be a non-option. Google says there are methods to hide moire with After Effects sorcery. Also Boris and some other apps. I don't use any of them, but I'll say this: I'm a big fan of Neat Video. Give them a try. I use the FCPX plugin version. There might be some additional plugins for Neat Video that specifically address moire.
 
The easiest fix for moire is to change the focal length (zoom in a little, or zoom out a little). Won't always fix it, but frequently it will. Use a full resolution external monitor so you can see if moire is present, then adjust the focal length until it is minimized.

And, as said before, don't use native 1080 mode if you can use UHD or 4k instead. 1080 mode is more prone to moire on the DVX200.
 
You must log in or register to reply here.
Back
Top