Additive Keying with Blackmagic Fusion

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@xanzuls Жыл бұрын

Really helpful. Would love some more advanced compositing tutorials in Fusion as well, especially working with CG and live action.

@aki_gong6271 5 ай бұрын

That's some super amazing content. Did you ever thought about releasing a whole compositing Fusion based course? It will be so cool, and it may help industry shifting towards Fusion too. Thabks for sharing!

@midgaard77 5 ай бұрын

Funny you should say that. I was, at one point, writing a book intended for use in training junior compositors in Fusion. I never quite finished it, but the rough draft is on my website: bryanray.name/2017/07/21/compositing-with-blackmagic-fusion-table-of-contents/ I don't anticipate it will ever be completed, since I now work for SideFX, and they probably wouldn't appreciate me writing on behalf of a different software company! Especially since we just revamped our own image processing system, so we're very shortly going to be in direct competition

@hisroyalillness 2 жыл бұрын

Hi Bryan, I am waiting for ages to do an overshoulder when you are working in Fusion. That was really fun and informative, Thank you so much. I still have to wrap my brain around the negative values thing in Float comping, but that was really a great introduction.

@midgaard77 2 жыл бұрын

*Usually* you'll want to avoid pixels with negative values, especially when doing an ordinary Merge, but in this case they're used to print in details that are darker than the background. Adding a negative to the background will darken the result. As I think about this a bit more, I think it might be a good idea to clamp the negatives at 0 rather than 1, so you *only* have negatives in that branch. What I found as I was setting it up this time is that both of my gain controls were adding brighter hairs, when I really wanted one of them to only add the darker ones. That's what I get for rebuilding the template from memory and a screenshot instead of actually refreshing myself on the technique more thoroughly! I should update the downloadable demo comp with that in mind... Another time you'll want to preserve negatives is if you're doing a noise extraction with the intent to reapply the noise at the end of compositing. Subtract the denoised plate from the original, resulting in only the noise. But since noise can push pixels in both directions-up or down-you need to make sure you still have those negative values so when you add the noise back on at the end, the average luminance of the picture remains the same. If the blacks were clamped such that you only get positive variance, the picture will get slightly brighter instead.