Brenton Lee Posted March 4, 2018 Posted March 4, 2018 sample: There's an iPhone photo at the start for comparison. Is there a point where too much ND can detract from an image? Obviously there's a point where you can underexpose but by my calculations via light meter, i should have been within a stop. At ISO 800, 2pm on a very sunny day it was so bright I had to stack 1.2 + .6 ND's to get the exposure down to about t4 / t5.6. Unfortunately the resulting footage seems underexposed and flat. I normally don't have to tweak the knobs much to get a decent image but this looks too crapped out. One team had bright red shirts, the other black and I can't get them anywhere near their original color again. Any advice or comments?
Philip Reinhold Posted March 4, 2018 Posted March 4, 2018 (edited) Well- You compare a linear picture with a logarithmic one. For a Log picture it looks exposed okay. You just needs to add a matching Linear LUT for grading. But it looks like you´ve got some IR pollution. Edited March 4, 2018 by Philip Reinhold
Brenton Lee Posted March 4, 2018 Author Posted March 4, 2018 Well- You compare a linear picture with a logarithmic one. For a Log picture it looks exposed okay. You just needs to add a matching Linear LUT for grading. That iPhone photos was just for reference as the ungraded footage is so far away from what it normally looks like that I think something else is wrong.
Philip Reinhold Posted March 4, 2018 Posted March 4, 2018 Yes you got a lot IR pollution. This happends because you use normal ND Filters & maybe a camera without any IR Cut in it. So you limited your spectrum by using NDs which doesn´t cut or correct the Infrared wavelenghts. Its difficult to correct in post & you will probably lose saturation. :-/
Brenton Lee Posted March 4, 2018 Author Posted March 4, 2018 Yes you got a lot IR pollution. This happends because you use normal ND Filters & maybe a camera without any IR Cut in it. So you limited your spectrum by using NDs which doesn´t cut or correct the Infrared wavelenghts. Its difficult to correct in post & you will probably lose saturation. :-/ Yeah, I figured its something like that. The way everything is tinged red has really sucked the life out of the color. It sucks though, I've used the ND filters a lot but never on days as sunny / bright as this one.
Brenton Lee Posted March 4, 2018 Author Posted March 4, 2018 Like this example ... was still a very bright day, I think I still had 1.2ND in but because it was overcast it was still easy to get a decent image.
Philip Reinhold Posted March 4, 2018 Posted March 4, 2018 You do have a little IR pollution there as well. Without getting to much into color theory & wavelenghts. Just have a look at this article: http://www.thehurlblog.com/what-is-ir-pollution-and-how-do-you-combat-it-tiffen/ Do you use a Blackmagic Camera?
Brenton Lee Posted March 4, 2018 Author Posted March 4, 2018 You do have a little IR pollution there as well. Without getting to much into color theory & wavelenghts. Just have a look at this article: http://www.thehurlblog.com/what-is-ir-pollution-and-how-do-you-combat-it-tiffen/ Do you use a Blackmagic Camera? Yeah, a pocket. I'll have a good read of that article tonight! Thanks.
Brenton Lee Posted March 4, 2018 Author Posted March 4, 2018 That is a very, very interesting article. I was aware of the whole IR thing but had never seen it IRL. Lessons learned, case closed. 1
Max Field Posted March 4, 2018 Posted March 4, 2018 Could you upload a raw clip of that footage so we could try playing with/correcting it?
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