Premultiply and unpremultiply basics, Nuke
If you have ever wondered what premultiply is and what it does to an image, then in this video I will show you understand it. Also here I have demonstrated what un-premultiplication is and when to to use it while working on comp.
Пікірлер: 19
its just woww what a explanation
Thanks
Loving all the tutorials. Subscribed! Quick comment though. Designer should incorporate a "Dots" system similar to Nuke's Dots as a way to organize the lines of graphs. Small thing, but keeps the whole thing looking clean.
Very nice explanation! Thanks!
Hey mate, the difference is mainly in how the color space is handled by nuke. The read node converts any color space into linear. So the premult option makes sure that Nuke unpremults the image before conversion and then premultiples the alpha. Making things mathematically accurate. To see any changes observe the partially transparent regions while changing color space and toggle this option. Personally I use whatever option that gives the best result! hope that helps.
keep up the good work bro i've been watching your videos since ... i dont know year now
Thanks a lot for this. It helps a lot understand the strange world of alpha channel :) please more nuke videos!
@Eosacro
10 жыл бұрын
yep! more Nuke goodness coming up! :) Glad you like em mate!
what is the hotkey to expand the node Premult2 on 6:01 UPD find ))) alt+p
Love your tutorials man. Thx! /Alvaro
@Eosacro
9 жыл бұрын
:) thanks mate!
Thank you for a great tutorial.
@Eosacro
9 жыл бұрын
+DigilusionStudios Most welcome mate!
Finally, some clarity on the simple but illusive concept of pre-multiplication. Thanks a lot. Can you also teach us something about keying, like getting finer details in hair or reflection?
@Eosacro
9 жыл бұрын
Siddharth Singh Couldn't reply sooner since I was busy mate, I have planned a few tutorials that I want to complete first, which are the basics of any CGI before getting into keying or working on live plates of any kind. It is in the works, just that it will take me a few months to get it up.
my alpha is multiplied by 2.8, how can get back to alpha 1 value
Sure mate, was planning to making one myself, will let you know when I upload it :)
Hey..the video was very helpful! Thank you..but one question..what is the difference between premultiplied checkkbox in the Read node..and the Unpremult node?
hii sir,can u give me some 3d camera projection tutorials...thanks