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These are the user uploaded subtitles that are being translated: 1 00:00:00,400 --> 00:00:01,100 in this lesson 2 00:00:01,100 --> 00:00:03,400 we're gonna learn how to add in ghosts 3 00:00:03,400 --> 00:00:06,866 often caused by filter flare into our comp 4 00:00:07,300 --> 00:00:08,533 so here's where we left off 5 00:00:08,533 --> 00:00:09,666 we added a vignette 6 00:00:09,666 --> 00:00:10,900 and in between each lesson 7 00:00:10,900 --> 00:00:12,966 I'm gonna go in and write a little bit about 8 00:00:13,000 --> 00:00:14,133 the optical 9 00:00:14,133 --> 00:00:16,466 aberration and the problems that are happening 10 00:00:16,466 --> 00:00:18,866 and the way we added it in 11 00:00:19,066 --> 00:00:20,600 so now let's take a look at filters 12 00:00:20,600 --> 00:00:23,600 and filters are very common inside of shooting video 13 00:00:23,600 --> 00:00:25,866 because we need to shoot at a 14 00:00:26,266 --> 00:00:28,033 consistent frame rate 15 00:00:28,133 --> 00:00:30,900 and so if it's too bright or if 16 00:00:30,966 --> 00:00:32,800 uh many different things are happening 17 00:00:32,800 --> 00:00:34,100 we're gonna need to add 18 00:00:34,100 --> 00:00:36,900 one or many filters on the end of our camera 19 00:00:36,900 --> 00:00:38,333 now this is what a filter looks like 20 00:00:38,333 --> 00:00:39,800 and the problem occurs 21 00:00:39,800 --> 00:00:41,900 because filters are flat 22 00:00:42,066 --> 00:00:44,133 and so what happens is that they have a 23 00:00:44,133 --> 00:00:47,566 very high likelihood of reflecting 24 00:00:47,766 --> 00:00:50,666 bright lights back into our camera 25 00:00:50,766 --> 00:00:51,966 now what is this look like 26 00:00:51,966 --> 00:00:54,600 well I've got a quick video here where we can see 27 00:00:54,600 --> 00:00:56,733 we have these very bright lights here 28 00:00:56,733 --> 00:00:59,200 and you'll notice as I frame through this 29 00:00:59,200 --> 00:01:03,200 they are creating ghosts that move throughout the frame 30 00:01:03,200 --> 00:01:06,333 depending on where they are in space 31 00:01:06,333 --> 00:01:09,033 as well as how the camera is moving 32 00:01:09,266 --> 00:01:12,900 now filter flare ghosts are dependent on the 33 00:01:13,066 --> 00:01:14,200 camera lens 34 00:01:14,200 --> 00:01:17,200 as well as the focal length or 35 00:01:17,200 --> 00:01:19,366 the zoom level of the lens 36 00:01:19,500 --> 00:01:21,000 so depending on that 37 00:01:21,000 --> 00:01:22,400 these can change 38 00:01:22,400 --> 00:01:24,933 they can either get smaller or get larger 39 00:01:24,933 --> 00:01:28,500 now you'll notice that they move exactly opposite 40 00:01:28,533 --> 00:01:30,933 of the bright lights in uh 41 00:01:30,933 --> 00:01:34,766 almost an exact opposite arc or a rotation 42 00:01:34,866 --> 00:01:36,433 180 degrees 43 00:01:37,100 --> 00:01:39,166 so you'll see these mostly or 44 00:01:39,166 --> 00:01:41,300 almost always whenever there is a light 45 00:01:41,300 --> 00:01:44,366 that is incredibly bright inside of the scene 46 00:01:44,533 --> 00:01:45,533 so let's go over here 47 00:01:45,533 --> 00:01:47,466 and let's take a look at what we have 48 00:01:47,466 --> 00:01:49,300 and we do not have many 49 00:01:49,300 --> 00:01:51,533 very bright lights inside of our shot 50 00:01:51,533 --> 00:01:53,733 however if we turn on our zebra stripes 51 00:01:53,733 --> 00:01:56,733 we do have some areas that are ultra white 52 00:01:56,733 --> 00:02:00,100 so these areas will create a filter flare 53 00:02:00,466 --> 00:02:01,566 so let's begin 54 00:02:01,700 --> 00:02:05,666 uh by dropping in a transformation to rotate 55 00:02:05,800 --> 00:02:07,233 our entire frame 56 00:02:07,400 --> 00:02:10,233 so hit t and connect this in 57 00:02:10,700 --> 00:02:13,200 so here we have a transformation 58 00:02:13,400 --> 00:02:15,733 and let's rotate this 180 degrees 59 00:02:15,733 --> 00:02:17,266 so we're just gonna flip 60 00:02:17,266 --> 00:02:19,266 the image around its axis 61 00:02:19,766 --> 00:02:21,800 and now we have this flipped around 62 00:02:22,266 --> 00:02:24,666 now we do not really wanna use the entire image 63 00:02:24,666 --> 00:02:27,333 we just wanna use the ultra bright areas 64 00:02:27,333 --> 00:02:28,066 so for this 65 00:02:28,066 --> 00:02:30,033 let's key everything else out 66 00:02:30,100 --> 00:02:31,533 so I'm just gonna hit tab 67 00:02:31,533 --> 00:02:33,100 drop in a key or node 68 00:02:33,266 --> 00:02:35,566 and I'm just gonna increase this up to one 69 00:02:35,866 --> 00:02:37,866 and so now inside of our alpha channel 70 00:02:37,866 --> 00:02:38,900 if we hit a 71 00:02:38,900 --> 00:02:42,500 we can see that only the ultra bright areas are 72 00:02:42,500 --> 00:02:44,500 staying inside of our frame 73 00:02:45,533 --> 00:02:47,533 so let's pre multiply this 74 00:02:47,533 --> 00:02:49,966 so we remove the rest of this information 75 00:02:50,200 --> 00:02:52,066 and now we only have the 76 00:02:52,066 --> 00:02:54,266 RGB information of our ultra brights 77 00:02:54,400 --> 00:02:56,200 so now we need to add this back 78 00:02:56,200 --> 00:02:58,100 into our original frame 79 00:02:58,100 --> 00:02:59,766 so I'm gonna move this over here 80 00:02:59,766 --> 00:03:01,200 and just for cleanliness sake 81 00:03:01,200 --> 00:03:02,766 I'm gonna create a new dot 82 00:03:02,866 --> 00:03:05,066 and then let's drop in a new merge note 83 00:03:05,066 --> 00:03:06,466 so I'm gonna hit the m key 84 00:03:06,700 --> 00:03:08,200 connect this to our original 85 00:03:08,200 --> 00:03:10,866 and connect the a pipe into our premult 86 00:03:11,000 --> 00:03:11,900 and now we can see 87 00:03:11,900 --> 00:03:15,200 we have the beginning of this filter flare effect 88 00:03:15,500 --> 00:03:18,133 now if we take a look at this footage 89 00:03:18,133 --> 00:03:19,200 you'll notice that it is 90 00:03:19,200 --> 00:03:21,900 not anywhere as bright as the filter 91 00:03:21,900 --> 00:03:24,100 or as bright as the original 92 00:03:24,100 --> 00:03:25,433 that we have here 93 00:03:25,466 --> 00:03:26,333 this is because again 94 00:03:26,333 --> 00:03:28,066 a lot of energy is lost 95 00:03:28,066 --> 00:03:30,666 and not a lot of energy is reflected 96 00:03:30,666 --> 00:03:32,600 so what we get is a very soft 97 00:03:32,600 --> 00:03:34,266 you'll notice it is blurred 98 00:03:34,266 --> 00:03:36,966 compared to the original light source and much 99 00:03:36,966 --> 00:03:39,100 much dimmer okay 100 00:03:39,100 --> 00:03:40,600 oops excuse me 101 00:03:40,600 --> 00:03:42,000 if we jump back to nuke 102 00:03:42,000 --> 00:03:44,133 we can add a blur 103 00:03:44,133 --> 00:03:45,933 and then turn down the mix 104 00:03:45,933 --> 00:03:47,900 so I'm gonna pull my merge down a little bit 105 00:03:47,900 --> 00:03:50,000 blur this after our premult 106 00:03:50,100 --> 00:03:51,366 and let's just give this 107 00:03:51,366 --> 00:03:52,666 a little bit of a blur 108 00:03:53,133 --> 00:03:55,266 ah maybe something like 7.5 109 00:03:55,266 --> 00:03:56,566 and in our merge 110 00:03:56,566 --> 00:03:59,300 let's pull our mix down quite a lot 111 00:03:59,300 --> 00:03:59,966 because again 112 00:03:59,966 --> 00:04:01,100 this is not 113 00:04:01,100 --> 00:04:02,066 going to be 114 00:04:02,200 --> 00:04:04,400 uh a purposeful reflection 115 00:04:04,400 --> 00:04:05,166 it is just an 116 00:04:05,166 --> 00:04:07,700 artifact from the lens that we're using 117 00:04:07,700 --> 00:04:09,000 so here we can see 118 00:04:09,000 --> 00:04:10,300 we have our 119 00:04:10,566 --> 00:04:12,700 basic filter flare added in 120 00:04:12,800 --> 00:04:15,866 so this is going to move nicely around our shot 121 00:04:15,866 --> 00:04:16,333 and this might 122 00:04:16,333 --> 00:04:18,766 even be a little bit too strong 123 00:04:18,866 --> 00:04:19,966 we can pull us even 124 00:04:19,966 --> 00:04:21,066 further down 125 00:04:21,166 --> 00:04:22,500 again this isn't something you 126 00:04:22,500 --> 00:04:24,400 really want to see or you 127 00:04:24,400 --> 00:04:25,866 it's not something you want your 128 00:04:25,866 --> 00:04:27,333 eyes to be drawn to 129 00:04:27,333 --> 00:04:28,266 this is just another 130 00:04:28,266 --> 00:04:30,166 important consideration that tells 131 00:04:30,166 --> 00:04:32,933 our eyes that this is being shot through a real lens 132 00:04:32,933 --> 00:04:34,433 with a real filter 133 00:04:34,566 --> 00:04:36,400 and what I really like about filter 134 00:04:36,533 --> 00:04:38,200 filter flare reflection 135 00:04:38,200 --> 00:04:40,133 is that it has an interesting movement 136 00:04:40,133 --> 00:04:40,600 you'll notice 137 00:04:40,600 --> 00:04:41,700 the movement of this 138 00:04:41,700 --> 00:04:43,066 is opposite 139 00:04:43,066 --> 00:04:44,600 of the movement of our frame 140 00:04:44,600 --> 00:04:46,533 and I find that that gives it again 141 00:04:46,533 --> 00:04:48,500 a much more life like quality 142 00:04:48,500 --> 00:04:49,400 by having our 143 00:04:49,400 --> 00:04:50,600 reflections or 144 00:04:50,600 --> 00:04:51,766 our hotspots 145 00:04:52,266 --> 00:04:53,533 be moving one way 146 00:04:53,533 --> 00:04:56,400 and then having this filter reflection another way 147 00:04:56,400 --> 00:04:57,266 you can see this 148 00:04:57,266 --> 00:04:58,333 adds quite a bit to 149 00:04:58,333 --> 00:04:59,366 the realism 150 00:04:59,366 --> 00:05:00,133 even though this is 151 00:05:00,133 --> 00:05:00,933 an incredibly 152 00:05:00,933 --> 00:05:02,266 simple effect 153 00:05:02,300 --> 00:05:03,566 you'll notice that this 154 00:05:03,566 --> 00:05:05,700 now looks like it's being shot through 155 00:05:05,700 --> 00:05:07,233 some kind of glass 156 00:05:07,300 --> 00:05:08,600 because whenever we 157 00:05:08,600 --> 00:05:10,200 add a flat piece of glass 158 00:05:10,200 --> 00:05:12,066 or a flat piece of material 159 00:05:12,166 --> 00:05:13,566 over our lens 160 00:05:13,566 --> 00:05:16,400 it is going to create these kind of hot spots 161 00:05:17,600 --> 00:05:19,133 so we just play through that 162 00:05:19,133 --> 00:05:24,100 once can see here we have that nice reflection effect 163 00:05:25,066 --> 00:05:27,500 now again this is dependent on your focal length 164 00:05:27,500 --> 00:05:29,933 so you can try shooting with this 165 00:05:29,933 --> 00:05:32,466 or you can just eye in the 166 00:05:32,700 --> 00:05:34,500 effect however you like 167 00:05:34,733 --> 00:05:37,100 now a common thing that will happen with this filter 168 00:05:37,100 --> 00:05:39,666 flare is it will be scaled differently 169 00:05:39,666 --> 00:05:42,900 so currently we only have 180 degree rotation 170 00:05:42,933 --> 00:05:46,566 and this is a sort of a rare circumstance 171 00:05:46,600 --> 00:05:48,366 now you'll notice inside of this movie 172 00:05:48,366 --> 00:05:52,266 we have 180 degree rotation and not much else 173 00:05:52,400 --> 00:05:55,933 however for certain zoom lenses or certain lenses 174 00:05:55,933 --> 00:05:58,600 will either scale up the reflection 175 00:05:58,600 --> 00:06:01,066 so we could just scale this in our transform 176 00:06:01,066 --> 00:06:03,666 or it will actually scale it down 177 00:06:03,733 --> 00:06:05,933 so depending on the look you're going for 178 00:06:05,933 --> 00:06:08,933 uh go ahead and just play around with different scale 179 00:06:08,933 --> 00:06:11,933 values for this uh reflection because 180 00:06:11,933 --> 00:06:14,866 it is going to slightly change how your 181 00:06:15,066 --> 00:06:16,433 effect comes out 182 00:06:17,500 --> 00:06:19,533 and again try different blur settings 183 00:06:19,533 --> 00:06:22,700 and different mix settings to see what you like 184 00:06:23,533 --> 00:06:27,200 now there actually is another way to add this in 185 00:06:27,200 --> 00:06:29,466 uh one which I didn't really find too much 186 00:06:29,566 --> 00:06:30,966 uh evidence for online 187 00:06:30,966 --> 00:06:32,866 but I've seen many times before 188 00:06:32,866 --> 00:06:34,300 so to see this 189 00:06:34,300 --> 00:06:36,100 uh kind of secondary filter flare 190 00:06:36,100 --> 00:06:37,766 let's copy and paste this 191 00:06:37,766 --> 00:06:40,266 and this is an alternative actually introduced by 192 00:06:40,266 --> 00:06:41,000 Ed Wetstone 193 00:06:41,000 --> 00:06:42,900 one of our creative development authors 194 00:06:42,900 --> 00:06:45,266 who has some great compositing tutorials 195 00:06:45,566 --> 00:06:46,866 and instead of a normal blur 196 00:06:46,866 --> 00:06:48,600 he actually uses a radio blur 197 00:06:48,600 --> 00:06:50,266 so let's go into our blur here 198 00:06:50,266 --> 00:06:52,833 and instead let's uh drop in 199 00:06:52,933 --> 00:06:54,766 uh a directional blur 200 00:06:55,333 --> 00:06:58,066 which is where the uh radio blur lives 201 00:06:58,066 --> 00:07:00,500 and change our blur type to radio 202 00:07:00,766 --> 00:07:03,866 and what this is going to do is it's going to smear 203 00:07:04,066 --> 00:07:07,833 our hotspots around in sort of a circular fashion 204 00:07:08,766 --> 00:07:11,566 again we can come in and change the blur length 205 00:07:11,600 --> 00:07:12,966 and make sure your blur 206 00:07:12,966 --> 00:07:15,366 center is in the center of your frame 207 00:07:15,466 --> 00:07:16,700 I'll see here 208 00:07:16,700 --> 00:07:17,966 we don't have a set to default 209 00:07:17,966 --> 00:07:20,033 so my frame is 2 80 210 00:07:20,200 --> 00:07:22,233 and the center will be divided by two 211 00:07:23,500 --> 00:07:25,533 and 7 20 / 2 212 00:07:25,533 --> 00:07:27,833 and that will give us the correct blur center 213 00:07:28,066 --> 00:07:30,300 now if you're gonna have multiple filter reflections 214 00:07:30,300 --> 00:07:32,400 I would use different scales on each of them 215 00:07:32,400 --> 00:07:35,800 so that they have a kind of different characteristics 216 00:07:35,900 --> 00:07:38,166 and we can see on the second merge 217 00:07:38,333 --> 00:07:42,100 uh it's gonna be a very subtle effect depending on how 218 00:07:42,200 --> 00:07:44,800 long we set this blur scale to 219 00:07:45,966 --> 00:07:47,833 we can see that right there 220 00:07:48,266 --> 00:07:50,266 and again this is um 221 00:07:50,266 --> 00:07:53,533 an effect that happens because of filter reflections uh 222 00:07:53,533 --> 00:07:55,600 so you can add this in if you wish uh 223 00:07:55,600 --> 00:07:59,300 it just gives it another layer of that kind of 224 00:07:59,333 --> 00:08:01,700 uh reflections happening from the glass 225 00:08:01,700 --> 00:08:03,666 you can see here we have kind of this 226 00:08:03,766 --> 00:08:06,700 smeared secondary filter reflection 227 00:08:07,900 --> 00:08:10,666 okay great so that is how we can add in 228 00:08:10,666 --> 00:08:12,866 filter flare reflections 229 00:08:12,866 --> 00:08:14,333 so it's a very simple process 230 00:08:14,333 --> 00:08:16,166 we just take our original image 231 00:08:16,166 --> 00:08:18,000 we flip it upside down 232 00:08:18,166 --> 00:08:20,500 or 180 degrees rotated 233 00:08:20,500 --> 00:08:22,466 and then we can scale it if we want 234 00:08:22,533 --> 00:08:26,166 from there we key out everything that is darker than 235 00:08:26,166 --> 00:08:27,500 very bright white 236 00:08:27,600 --> 00:08:30,133 now this in in this case we have an EXR image 237 00:08:30,133 --> 00:08:32,533 so we have color values over 1 238 00:08:32,533 --> 00:08:33,766 as you can see here 239 00:08:33,966 --> 00:08:35,500 we have some values in the threes 240 00:08:35,500 --> 00:08:36,066 in the fours 241 00:08:36,066 --> 00:08:36,933 in the fives 242 00:08:36,933 --> 00:08:38,066 and so this will work 243 00:08:38,066 --> 00:08:40,466 if you're using a traditional piece of footage 244 00:08:40,466 --> 00:08:42,500 something shot with a camcorder 245 00:08:42,566 --> 00:08:43,833 a real camera 246 00:08:44,133 --> 00:08:45,400 or a piece of film 247 00:08:45,400 --> 00:08:47,733 you might need to drag this back a little bit 248 00:08:47,733 --> 00:08:50,066 just so you pick up some of those 249 00:08:50,533 --> 00:08:53,100 non HDR values 250 00:08:53,133 --> 00:08:54,566 but since we have an EXR 251 00:08:54,566 --> 00:08:57,800 we're gonna have values in the ultra white range 252 00:08:57,966 --> 00:08:59,900 from there you can just pre multiply 253 00:08:59,900 --> 00:09:01,666 all the other color values away 254 00:09:01,800 --> 00:09:02,966 blur it a little bit 255 00:09:02,966 --> 00:09:05,933 and then merge it over the original footage 256 00:09:05,933 --> 00:09:08,500 at a very low mix value 257 00:09:09,300 --> 00:09:11,766 and that will give us these very nice filter flare 258 00:09:11,766 --> 00:09:14,566 reflections that act and 259 00:09:14,566 --> 00:09:17,466 move differently than the rest of the frame again 260 00:09:17,466 --> 00:09:20,366 giving us the effect or giving us the illusion that we 261 00:09:20,366 --> 00:09:21,766 are seeing this 262 00:09:21,766 --> 00:09:24,800 through some sort of glass mechanism 263 00:09:25,866 --> 00:09:27,466 so now that we have that done 264 00:09:27,466 --> 00:09:28,800 let's take a look at 265 00:09:28,900 --> 00:09:32,533 lens distortion and field curvature in the next lesson 18612

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