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hi and welcome to this tutorial. i'm remushosu for bluefx.net and in this video we're going totake a look at creating transparency for footage that was shot on black. now, some of the video content out there onthe market is pre-keyed, which means it has a transparent alpha channel built in but manystock footage you get online just have a regular black background. so, the first impulse would be to just setthe transfer mode to screen but this is not the best solution. as you can see the footagedoesn't look natural at all, it is semi-transparent and vague. also, the screen mode doesn't actuallycreate real transparency, it just creates

transparency based on the layer bellow soif you want to save your video as a pre-keyed footage for later use it's not going to work. keying out the footage is not a solution either,because the keylight effect doesn't work on black backgrounds, the color key returns amessy result and the extract effect is also very inaccurate. there are a few techniques that can help youremove the background but instead of going through them, we're going to choose the fastestand most efficient way of doing this by using a free 3rd party little plug-in. the plug-in is called "unmult" from redgiantsoftware and you can get it for free on their

website. you need to select your operationsystem and after downloading and unzipping the file just place it in the after effectsplug-in folder and open or restart after effects. here are the paths to the plug-in folder forboth windows and mac. (windows) program files\adobe\adobe aftereffects \support files (mac os) applications/adobe after effects the plugin will show up in "effect - knoll- unmult" or you can just type it in the effects panel,then all you need to do is drag it on the footage. unmult is very useful and efficient for smokelayers (i'm using a blue background so you

can see the keyed layer), flares, fire andwater drops layers. sometimes you may want to add a levels colorcorrection effect to strengthen the alpha. and also an exposure effect if necesarry. thanks for watching and see you on our nexttutorial.