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Question

Combler transparence After Effect CS6

Forum|Forum|7 years ago
February 26, 2018
3 replies
386 views

Bonjour à toutes et à tous.

Tout d'abord désolé mais je n'arrive pas à mettre de mot sur mon titre de demande (il doit y avoir un terme technique pour ma demande)

Je suis l heureux possesseur de CS6 depuis 1 mois, j ai fait un clip vidéo mais me retrouve face à un problème.

Tout d abord l idée est de faire une vidéo ou mon corps disparaît et l on voie seulement mes mains (je fait rotoscopie 8h pour 5 minute de vidéo).

J'ai une question très important puis la 2 eme est plutôt une idée de solution.

1 ) Voila une copie écran de mon projet ( ce n est qu une ébauche mais c'est juste pour imager ma demande)

Le problème c'est que quand je fais passer la main au dessus de la table comme ceci (roto degeux mais c juste pour imager ma demande )

J aimerai que quand la transparence passe au dessus de la table, on ne le voie pas (j ai essayé d impr écran et de mettre la table bleue en JPEG, mais difference couleurs et on voie le contour du bras meme quand je travaille le contour).

je souhaiterai donc pouvoir naviguer avec mes mains au dessus de la table sans que l on voie le "trucage"

2 eme question

Je passe par rotoscopie 8h pour 5 min de vidéo , j essaie avec keylight mais le resultat est déguelasse a cause des ombres je pense, et peut être difference de vert, mais n étant pas en France, je ne trouve pas ici de tenues spéciales chromakey. Je dois meme fabriquer mes soft box.

Voici la foto de ma façon de travailler, sachant que j utisie aussi une cam standard, mais les resultats son propres si je dois seulement me détourer moi.

Par contre faire promener mes mains sans mon corps c est une autre histoire. Si quelqu un a une idée, je suis preneur, ca me ferai gagner un temps fou (j ai 50 vidéos à faire de ce type)

Voila, je remercie tout ceux qui on pris le temps de me lire, et qui pourront aider le novice que je suis. Je passerai checker tout ca en fin d après midi, en espérant avoir assez d element de réponse pour pouvoir bosser ce soir.

Merci à toutes et tous

This topic has been closed for replies.

A

adelj3957465Author

Participant

Kyle and Dave Thanks very much for your answers.

Ok ill work the light and i ll Take a bigger green background.

Any solutions for my 1st question ?

Kyle Hamrick

Community Expert

Between translation issues and not really having enough context on your project, I'm not really sure what other helpful info I can offer.
If you set things up right with the greenscreen, I would think you should be able to avoid having to rotoscope too much. You could also build some "rigging" elements with stiff wire, etc. that could be painted green, which would likely be a lot easier to remove from the footage than your hand is.

Kyle Hamrick

Community Expert

As Dave said, about 90% of the battle for successful keying/greenscreen is in proper lighting.

The camera you're using will also make a big difference. Consumer-grade cameras tend to compress colors a LOT, which makes it much harder to get clean edges.

If you have a large number of these videos to create, take the time to properly educate yourself on the techniques and equipment necessary for success, and make sure you have your process properly planned and tested before shooting the whole series. Get everything set up, shoot some test shots, and FULLY test your post-production workflow. Once you've fully tested the whole workflow, THEN you can begin shooting your series. If possible, leave everything set up until you've completed all the shoots, so everything will be consistent. If that's not possible, take tons of photos and draw diagrams so you can replicate everything as closely as possible.

Good luck!

Dave_LaRonde

Inspiring

To me, this is not a shot worth saving. It is not illuminated properly for green screen work.

The green screen background is much more brightly illuminated than the subject. Because of that, Keylight sees them as two different colors. Keylight also works better if the background is not so bright. It has a very aggressive spill reduction algorithm and it easily can introduce noise into the keyed subject.

There is also a large amount of green spill on the parts of the subject you want to keep. It can be a problem to remove, especially combined with the very bright background.

The lighting on the subject is also inconsistent. There is a big difference between highlights and shadows on the subject's green shirt. This makes it difficult to get a good key.

A good chroma key begins with good lighting, and it is shot under good conditions. You have too few lights and I also think your green screen is too small. This forces you to place the green screen too closely to the subject, which is causing a lot of the spill problems.

I STRONGLY recommend that you Google terms such as "lighting for chroma key" or "lighting for green screen". To get a good green screen shot, you need to light it properly, and you need to understand the resources you need to make it successful.

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