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What is Alpha Channel in Compositing
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Күн бұрынHow to use Alpha Channel? Alpha Channels is a topic that can be very confusing and hard to understand. This lesson reveals everything that you need to know about Alpha Channels. How to distinguish them one from another and how to use them as a compositor, as well as how to fix an occurring problems that might show up. Thank you and enjoy.
0:00 Intro
0:12 RGB Color Channels
2:56 Alpha Channel
4:00 Different Alphas
4:14 Separate Alpha
5:13 Premultiplied Alpha and Straight Alpha
5:44 Separate vs Premultiplied and Straight
5:56 Premultiplied Alpha
6:29 Straight Alpha
7:00 Premultiplied vs Straight
10:41 Bad Alpha Interpretation
11:25 Black Fringe Fix with Remove Color Matting Effect
12:56 Preparing and Exporting an Alpha Containing Files
14:02 Final Words
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#visualeffects #compositing #vfx
@unclefrey675 5 жыл бұрын
THIS IS GOOD, VERY GOOD. I will share this whenever i can. Damn THis guy is good. Thanks Man.
@unclefrey675 5 жыл бұрын
@@FireballVFX Got you my man
@FireballVFX 3 жыл бұрын
Thank you : ) please do share it
@Black13Kira 4 жыл бұрын
This is what other tutorials not teach us. It's very useful when you working in industry level, you should understand the deep difference in premult and unpremult file for proper working. Thank you keep doing it.
@wiremanhq 3 жыл бұрын
Thank you very much for your tutorial, You have a real talent for tuition and providing technical information. There are lessons here beyond the information you are addressing.
@TasshayyoAli 2 жыл бұрын
the way you teach is amazing. every important aspect is told. please continue to teach us.
@gigilokuning 4 жыл бұрын
This explanation is on spot, everything is clear eventho I couldn't understand all the terms at first. Your video is such a big help. Thank you
@LostPopKiller 6 жыл бұрын
Thank you! it's very clarifying and well structured, I read about premultiplied and unpremultiplied a while ago in the book Compositing Visual Effects by Steve Wright but didn't quite understand what all that really mean until now. I find your videos very motivating, specially the canyon one and the photoreal 2D compositing, I'm glad you're sharing your knowledge, keep it up!
@FireballVFX 3 жыл бұрын
Thank you. I know that it is not an easy topic to understand. Visuals and motion graphics makes it easy though. I am glad it is motivating and helpful : )
@edneijames 4 жыл бұрын
I just want to say THANKS, MATE !!!!! Everything in all playlist that you created, are very useful and totally applicable in real life. I'm really thankful for it..
@edneijames 4 жыл бұрын
Fireball VFX , I’m beginner in this VFX world.. I’ve some knowledge in AE, PS, C4D and start studying Nuke for now.. There’s a lot of stuff to learn yet but I’ll don’t give up !!! I really want to be a good compositor some day.. Waiting for your next vídeos mate!!!
@FireballVFX 3 жыл бұрын
Thank you, there will be more to come someday ; )
@andersutterstrom6089 5 жыл бұрын
I encourage you to continue with your tutorials. The little I've seen is very good. Cheers!
@FireballVFX 3 жыл бұрын
Thank you very much for your encouragement!
@leitflux 5 жыл бұрын
Many thanks, man! You're very good at teaching. I am grateful to have found your work!
@FireballVFX 3 жыл бұрын
Thank you. Not easy to find my videos with so low views in the sea of youtube ; )
@JafferAZ 2 жыл бұрын
So happy to see such quality videos.Would love to see more from you.Thank you so much.
@jdcv17 2 жыл бұрын
Thank you for making it easy to understand.
@Really_Tho 3 жыл бұрын
Yeah!! Just Subscribed this channel after watching this video for the 1st time...
@benjaminallison4644 Жыл бұрын
Killer video, just what I was looking for.
@le3aerialphotography870 4 жыл бұрын
Brilliant descriptions. Fast pace keeps your attention.
@FireballVFX 3 жыл бұрын
Thnx, that is my goal ;)
@shadowoflight4743 4 жыл бұрын
Thank you for your information. Patiently without a pause. Keep up!
@BenCaesar 2 жыл бұрын
This is such a clear walkthrough on a complex subject
@totoosarts Жыл бұрын
I really appreciate your wonderful tips and detailed explanations of stuff nobody else seems to care about but are truly important for serious VFX artists. I hope you are well and all is fine with you, it seems you are busy with work so much that you haven’t had the chance to post new tutorials on KZfaq, but we look forward to more lectures like these from you, stay safe and God bless :)
@FireballVFX Жыл бұрын
Thank you for your kind support :) i am well, and you are correct - I am going through my journey. I also want to come back and continue these detailed tutorials, once the time is right 👍
@totoosarts Жыл бұрын
@@FireballVFX I’d like to wish you all the best and I’ll remain a follower hoping to enjoy more tutorials from you. In this field, i find, there is no end to learning! May the Lord Jesus Christ bless your heart 😇😇😇
@FireballVFX Жыл бұрын
@@totoosarts 🙏👍🤗💪
@charmander2992 3 жыл бұрын
Great video!!!! Thank you
@melaniemay8706 4 жыл бұрын
This guy is brilliant! Thank you
@Richard-ig2gv 4 жыл бұрын
Best video explanation I have ever watched. Subscribed.
@jasroop_sandhu 3 жыл бұрын
Never understood this before...this video is great! - keep up the good work 😀
@MAALTECH 25 күн бұрын
Great explanation and to the point. Thank you.
@musafir1930 Жыл бұрын
beautifully explained, love it. thanks.
@FireballVFX Жыл бұрын
🙏🤗👍
@peternavidad113 5 жыл бұрын
you are amazing! thank you so much for sharing your knowledge!
@FireballVFX 3 жыл бұрын
I am glad I was helpful : )
@kenpachizaraki1947 3 жыл бұрын
Great channel. Hope the KZfaq algorithm finds you, and you do well. Thanks.
@ramykhalil903 Жыл бұрын
I love this tutorial man, Thanks
@marceldezor441 4 жыл бұрын
Thank you for this clear explanation, well done!
@grahamh7041 4 жыл бұрын
yes, good ... very .... good ....thanks for sharing
@adproproductions2038 3 жыл бұрын
Wow, excellent content! Very well explained. Thank you!
@paulmakesthings 2 жыл бұрын
Very helpful. Thanks!
@jformento 2 жыл бұрын
This is gold. Thanks.
@austin_theartist 2 жыл бұрын
Excellent video
@eng_3dartist329 2 жыл бұрын
thats a really mysterious gold informations ! i thank you alot for that super detailed explaining you are professional in explaining :)
@FireballVFX 2 жыл бұрын
Thank you, it means a lot :)
@kapilsapkal2987 2 жыл бұрын
Wow your explanation 👌👌❤️
@tjcousler 4 жыл бұрын
THANK YOU! I finally get it now!
@godotShaderBoy 3 ай бұрын
your explanation is great! well done
@FireballVFX 3 ай бұрын
Thank you, i did my best )
@logangraham2956 2 жыл бұрын
OH! ok thanks XD was tinking with osdev and was wondering what the alpha channel was for. i set it to max and ran my kernel and then i set it to 0 and ran my kernel but didn't notice any difference. i'm guess i'll have to implement this myself somehow.
@artkiko4460 3 жыл бұрын
thank you so much! that was super helpful.
@santi9532 4 жыл бұрын
This is my first time researching vfx and you explained it so well even I understand what’s going on and I’ve never even done it before. You’re a genius! Also, what software are you using?
@FireballVFX 3 жыл бұрын
Thank you very much :) I am trying my best. For the tutorial I used After Effects.
@MomciloUzunovic 4 жыл бұрын
thank you for explaining everything! Very helpful!
@i20010 5 жыл бұрын
Very good videos! thank you.
@Halb138 4 жыл бұрын
Holy shit, i just wanted to design a graphic for my tshirt on paint.net with a few plugins I didnt understand, which made me ending up here. Holy shit, im hella confused but the first minutes really helped out a lot since i couldnt even find an easy explanation of "alpha chanell" and "RGB"
@matslexell 3 жыл бұрын
Great video! Thanks for the lesson :)
@andygagarin3725 2 жыл бұрын
very nice, thank you !
@michailmarkou1995 3 жыл бұрын
great tutorial!
@benni6363 3 жыл бұрын
lol just a random VFX jedi found in the forest of KZfaq . . . Thank you, Master Fireball . . .
@FireballVFX 3 жыл бұрын
only true padawan finds the jedi ;)
@MrForestExplorer 4 жыл бұрын
Great videos dude.
@roohawkins7412 2 жыл бұрын
This is so great
@SliwkaProductions 4 жыл бұрын
Thanks for this helpful video 😉
@MrFolaz 3 жыл бұрын
Thanks for these informative videos . the Pre-multiplied and Straight Alpha is important topic to learn . i had a problem with it when i was working in a full feature film , the green screen shots i keyed in AE and sent it to DaVinci Resolve for color grading was looking strange, had a black border, then i learned about the Pre-multiplied and was able to correct it in "Resolve ", it turns out Resolve interpret the alpha as "Straight" and i had to re set it in the settings. another thing i had a problem with was "the black level" there was different types of it i dont remember what its called , it did change the contrast or the Gamma, making the image look strange, and i had to re set it also. if you could look it up and talk about it it would be great, although i think its more related to color correction than VFX. and one more thing :) "the bit depth" option in After effect has an impact on the image quality especially on Keying and roto, its better to set it on 32 bpc for higher camera codecs and raw formats, and lastly :D :) the "set project work space" option in AE also i had to play with it when working with raw LOG format, to probably do keying. maybe thats why other VFX software such as Nuke are better that AE at handling High quality or Raw formats. if you cloud talk about these topics in a video and clear them out for me it would be awesome , not many people talk about them.
@MrFolaz 3 жыл бұрын
@@FireballVFX i sure did subscribed , and watching all of your videos
@FireballVFX 3 жыл бұрын
Very helpful comment. Thank you for adding a lot new good points to this topic. There definitely must be more issues between different softwares in regards to alpha channel. More about it could be explored for sure ;) I will keep that in mind
@FireballVFX 3 жыл бұрын
thank you :)
@YOUTHSTYLE 3 жыл бұрын
Amazing , you explain very well , subscribed 🤘 You helped me solve doubts related to alpha , thanks 😁
@FireballVFX 3 жыл бұрын
I am glad, my mission is complete then : )
@ryanbarton72 Жыл бұрын
great great video
@MatthewClowney 3 жыл бұрын
Thank you so much for this marvelously clear explanation. It is enormously helpful! I'm a little confused about one little thing.... In your Premultiplied & Straight alpha channel examples, why do both of these have such a large feather, effectively giving the perimeter of the subject a wide semi-transparent haze even on the examples you described as looking fine? That threw me off. Because that feather seemed wrong to me on all the examples, it was a little hard for me to clearly see exactly what you were seeing as *looking right* or *looking wrong* on each alpha channel interpretation. You explained the color spread of semi-transparent areas in the "Straight" method quite nicely, and I can see that part clearly in your examples. I'm just still a little unclear on what you're seeing as fine or not so good on the rest of the edges which aren't semi-transparent. This tutorial is EXTREMELY helpful in explaining what the alpha channel tools are and how to use them. But if you're up for sharing a bit more, I think it might help me to further calibrate my thinking about this if I were to understand what the purpose of that feather was. (?) Thanks again!
@MatthewClowney 3 жыл бұрын
@@FireballVFX Yes, gotcha. That makes a lot of sense. Thank you so very much for taking the time to answer my question!
@FireballVFX 3 жыл бұрын
Hi, I am glad you found this tutorial helpful. If I understood your question correctly, and if you are referring to 7:47-10:41 - then a large feather is there on purpose so that it would be easier to spot what I am talking about, however, in a real process of compositing a feather edge has to be visually seamless and look very natural. When I say "fine", I am referring to AE's technical interpretation of an alpha channel as being correct, I am not talking about the artistic or correct visual way of setting up alpha - it is all about making the software accept alpha on it's end - make it connect the dots. I hope I understood your question well, let me know if not and I will try to answer it better.
@dimiterprenerov8683 Жыл бұрын
Nice!
@rnpk9572 6 ай бұрын
thanks
@StefanKarisch 2 жыл бұрын
great thank you
@mpix2000 Жыл бұрын
thanks bro
@nkbabusbi9103 4 жыл бұрын
very nice tutorial. thanq .can you please explain in what instances we can use the alpha channel.
@FireballVFX 3 жыл бұрын
You are welcome. you can use it to separate an element from the shot.
@nybcp 5 жыл бұрын
Boss 🙌🏾🙌🏾🙌🏾🙌🏾
@kostavsheoran1530 Жыл бұрын
Wait.... in premultiplied alpha , rgb channel is premultiplied with black colour that is 0 , for all semi transparent areas, but whatever we multiply from 0 is 0, that is prtially transparent areas are black , that means premul alpha cant have semi transparent ?
@FireballVFX Жыл бұрын
Anything that is grey is partially transparent
@zweiche 4 жыл бұрын
Thats fuking AMAZING, LOVE YOU BRO!
@zweiche 4 жыл бұрын
A question if you dont mind , i started with davinci since it was free and i have good gpu , maybe i have watched every guide on KZfaq about davinci and fusion , but now i feel like there isnot really big channels and guides about it . Do you think i should learn premiere+aftereffects now since there are tons more guides around youtube ? learning more is always better as you said but im doing this as a hobby and kinda afraid to learn everything from 0 now :) appretiate for those guides!
@FireballVFX 3 жыл бұрын
Sorry for the late reply. If you want to become a pro colorist, stick with Davinci and you will be just fine. If you are into editing, then learn Premiere Pro.
@malaydoshi 3 жыл бұрын
👍🏻👍🏻👍🏻👍🏻
@beautifulvfx9722 3 жыл бұрын
Thank you so much for the excellent lesson ~I think your lesson is the best ever in the world. thank you. I'm a After Effects user using other adobe programs also. by the way I have questions ~ Is illustrator AI file straight alpha? or premultiplied alpha? I'm confused. Does AI file have alpha channel or matte color? by making background empty in illustrator, can we say that AI file has an alpha channel? I'm wondering how to get an alpha channel in normal AI file. Could you give me some advise for that matter?
@FireballVFX 3 жыл бұрын
Hi, thank you very much. I don't use Illustrator and not sure how it operates. However, an alpha channel depends on the type of file that you choose to export as, so if it is .png, it will provide option for alpha channel, so just empty background is not enough, you have to export it with the right file format.
@beautifulvfx9722 3 жыл бұрын
@@FireballVFX Thank you for your advise. It really helps me a lot :) have a good day~!
@FireballVFX 3 жыл бұрын
@@beautifulvfx9722 no problem, have a nice day as well :)
@kalicambria 2 ай бұрын
Just gotta say, this guy is freakin beautiful
@leomac1829 2 жыл бұрын
is the alpha channel used for selection then?
@FireballVFX 2 жыл бұрын
What do you mean by saying "used for selection"?
@satyamdograreallife Жыл бұрын
Hey Man, while explaining SEPARATE ALPHA you said " It's a separate file of BLACK & WHITE IMAGE also known s LUMA MATTE " . So this Black & White Image is the Real Black & White Image, like one shows the Colored Image in Greyscale ? Or you're saying It's the White that is Kept & Black that is deleted just like a LUMA MATTE image ??
@FireballVFX Жыл бұрын
Hey, separate alpha is literally a separate video/sequence file which if opened and played will show you the video of black and white (and grey) - whites and greys are stored in visible rgb channel.
@satyamdograreallife Жыл бұрын
@@FireballVFX Alright So a Black & White Image is an RGB Image with an ALPHA Channel In It & LUMA MATTE is a Separate thing with no ALPHA in it. Keeping the White & Deleting the Black I got it Right Now ??? Right ???
@FireballVFX Жыл бұрын
@@satyamdograreallife Let me confirm. Separate Alpha is an RGB image with no alpha channel in it, it only contains RGB but of white and black values/colors. Now in regards to Luma Matte - it can be any image that you use to keep whites and delete blacks. So Separate Alpha image is used as Luma Matte to do the job.
@satyamdograreallife Жыл бұрын
@@FireballVFX Alright Man🤝 Now I get it. Solid Tutorial Though. Wanna Love to Watch more from you
@FireballVFX Жыл бұрын
@@satyamdograreallife thnx 👍
@user-zd7cq8xq7y Жыл бұрын
hi bro this is 2018 you kew sho much when i was not even in this field how mouch you would have knowledge now any tips to me?
@FireballVFX Жыл бұрын
Moving slowly to Unreal Engine, always learning. Are you in the field now?
@user-zd7cq8xq7y Жыл бұрын
@@FireballVFX im a neew bie started after covid seriously and im lovign it
@user-zd7cq8xq7y Жыл бұрын
@@FireballVFX if you could make a video over lensdistortion correction and calculation for vfx and focal length estimation and all liek this stuff it would be great
@FireballVFX Жыл бұрын
@@user-zd7cq8xq7y thats great, i am happy for you!
@vpolekar 4 жыл бұрын
how to export rgb alpha+matte in single layer
@vpolekar 4 жыл бұрын
@@FireballVFX how to export RGB+ALPHA+STRIGHT MATTE+PRIMARILY MATTE IN ONE SHOT .
@FireballVFX 3 жыл бұрын
if you mean to export all alpha channel methods in one go, then you can't. However, you can try to create each comp for each method, then prepare the render queue and export that way. Let me know if it will work.
@vpolekar 3 жыл бұрын
@@FireballVFX Ok, Thank you
@RuthlessMetalYT Жыл бұрын
Do I need premier pro to do alpha channel videos? I have a video that I need to remove the green screen in order to use it in OBS Live. But that seems to be impossible at the moment? HELP?!?!?!?
@FireballVFX Жыл бұрын
Green screen removal in live process has to be done locally by live software (as After Effects only works for non-live, as far as i know). In your case I would look for how to remove green screen in OBS, there must be such feature, but i dont think it will be super clean keying. If you want to prepare a video to be used later in live OBS session, then yes - after effects is the software to go with.
@hamsahoney777 3 жыл бұрын
Someone told me I was the alpha channel. What does that mean?
@hamsahoney777 3 жыл бұрын
@@FireballVFX oh very much so. Wait a few months before getting the covid 19 vaccine because a bunch of people are about to get mercury poisoning and if and when the aliens show themselves, don't trust them or go onto their ships. They're here to harvest our organs. Stay well and may creator provide you with many blessings. Everything is going to be alright.
@FireballVFX 3 жыл бұрын
An interesting expression. Have no idea what it means :) maybe you reveal the importance in overall?
@gynalara4995 3 жыл бұрын
What is your opinion with ProRes 4444 alpha render setting? Is the one i always use, but i want to hear an expers opinion. Thanks
@andrewhowie6646 Жыл бұрын
Don't trust this explanation of alpha channels. Quicktime does accept alpha channels, the example given here uses a 'codec' that doesn't - H264. Quicktime is a container for many codecs and is not a video format. This is basic stuff. Also, to actually understand alpha channels the mathematics is not hard and is a foundation that every compositor should know. AfterEffects hides these basic concepts which is why it's not used in any serious cinema VFX pipeline. Understanding how alpha channels work mathematically will help you to use any compositing software.
@Turdlehead 2 жыл бұрын
Seriously? You claim that you can't export *_a Quicktime with alpha from AE_* ??! You don't mention that that is (well, ok, _was_ ) *_A WINDOWS LIMITATION_* ?!! Of course, you can export a QT with alpha… using ProRes 4444! 🙄🤦🏼♂ And yeah, in the meantime even under archaic Windows.
@amadossa4866 5 жыл бұрын
great videos, Thank you
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