making muzzle flash background transparent [ANSWER]
Posted: Tue, 8th Apr 2008, 9:14pm
Post 1 of 7
Hi I am looking to use effectslab lite add a load of muzzle flashes to my short film. Only problem is someone else is colour correcting and grading the edit while I am doing the flashes, and they just want the muzzle effect and nothing else. I want to add them all to the edit then save out the clip with just the muzzle flashes and the rest transparent so I can pass this on to the grader and he can drop onto his edit on adobe prem cs 3. At the mo the the flashes are on a black background. So what settings do I need to use when I render out and save my clips? I have read somewhere that in render settings I need to chenage to alpha but my render settings have no such information? Is this a problem with lite version? I am new to this so any help be appreciated.
Posted: Tue, 8th Apr 2008, 9:34pm
Post 2 of 7
This is the process in which to do it...
Full rough edit/cut you movie into clips (your choice)
Take edit/clips and add muzzle flashes
Take new file(s) and color grade them
Make final edit
You always want to put the effects under the color grading.
Posted: Tue, 8th Apr 2008, 9:44pm
Post 3 of 7
Thanks man, only prob is The other guy is already half way through colour correcting the film. When I bring him the flashes he will blend them into the film and final colour correct them, then grade the whole film after. But he is using adobe premiere and after effects for this. Can I only get out my muzzle flashes with a black background or the background footage (which he will not use)?
Posted: Tue, 8th Apr 2008, 11:41pm
Post 4 of 7
In your render settings, make sure the box is ticked that says "Retain alpha info" or something similar. Then Render to Quicktime, use the Animation codec, and make sure that the color depth is set to "Millions+." This will render out only the muzzle flashes, with an embedded alpha to remove the background.
Alternately, if you just turn off the layer with the footage before you render, it will render out with a black background. Then when your friend composites it in in Premiere or AE, he just has to set the blend mode to Add and it should work just fine.
Posted: Wed, 9th Apr 2008, 12:25am
Post 5 of 7
Under my render setting I dont have a box to tick to retain alpha info or anything similar. Thats exactly what I need though lol. The only options I get are output type, which is set to standard and no other choice, composite quality, image scale, file type that also seems to be missing quicktime animation codec, and a tick option for if I want to keep audio. Thats my lot! Im using effectslab lite. Could this be the reason? Otherwise yeah I will have to just output on black, but im not sure just how well the black can be removed. Some of the muzzle flashes you can create look amazing and real. Would be a shame for them to get downgraded.
Posted: Wed, 9th Apr 2008, 1:36am
Post 6 of 7
Ah yes, the Lite version. the render system has changed since then, sorry. EffectsLab Lite doesn't support alpha export, sorry. You'll have to go with the black BG.
As long as the background of the muzzle flashes is black, it can be removed perfectly by switching the blend mode of the clip to "Add" when you composite them together in Premiere or AE. You can also try the "Screen" blend mode; depending on the effect one might look better than the other.
Posted: Wed, 9th Apr 2008, 9:19am
Post 7 of 7
Cheers Axeman, that be my prob right there. May upgrade my version if anything.