DSLR Hair Moire Questions

[Andrew Allsbury]

Ladies & Gentlemen,

I recently drank the DSLR coolaid. I purchased a t2i for still images and instantly fell in love with its video capabilities, over the past few weeks I have used the t2i on several small projects and really have hit only one major snag (not major enough to become un-excited, but major) and that is hair moire! I shoot a lot of docu. style interviews for webisodes...promos...etc and recently have been running into rainbow colored hair (on head) moire constantly! Up until this point I have attacked the problem in post by using channel blur, gaussian blur, black diffusion, down rez to 720, etc. BUT having been in video for about 10 years and having worked through complete nightmares (like 35mm adapters) several times I would imagine that there are things that can be done during production to lessen these problems (angles, exposure, lighting, focus, etc). What has been everyone else's experiences and what are your suggestions??

Thank you!

[Chris Hurd]

Moved to T2i from 7D -- since it's about the T2i and not the 7D.

[Khoi Pham]

If you use a loop to shoot like a Z-finder you will see it when you shoot, and so if you see it you can change angle or open your apperture more and focus on the nose or something else to blur it out, if you get it in post, chroma noise reduction will takes it right out.

[Andrew Allsbury]

Khoi,

Could you elaborate on the chroma noise reduction fix? Thank you!

[Joel Peregrine]

Would lowering the sharpness in the picture profile help?

[Khoi Pham]

I use Photoshop CS3 and it accept .mov, "use open as smart object" to load a .mov in and apply noise filter/ reduced color noise and render it out, works very well and remove all color aliasing from hair, water...
btw if you don't know photoshop, go to view and check on animation so you can play that movie clip inside photoshop.

[Andrew Allsbury]

Khoi,

Wow...am I the only one that didn't know photoshop was an amazing tool for video? I am running some tests now...but my first test removed 90% or so of the nasty moire effect from both hair and tile roofs. Takes a whiiiiile to render out...I will report back results!

[Khoi Pham]

The roof top usually have moire pattern and or aliasing combine so it is difficult to remove, I do see it when I shoot with the zfinder and so I slightly soft focus it until it goes away, then back in post I add a little sharpen, it look acceptable, if I have to shoot buildings and such that is what I do but I try to avoid it if I can.

[Khoi Pham]

Originally Posted by Joel Peregrine

Would lowering the sharpness in the picture profile help?

Yeah but it is still there.

[Andrew Allsbury]

Using photoshop to correct this issue is a great work around..just import the footage into photoshop...use the noise reduction filter...and kick it over to premiere as a psd..works great!