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These are the user uploaded subtitles that are being translated: 1 00:00:00,512 --> 00:00:02,304 Welcome back 2 00:00:02,816 --> 00:00:08,960 In this video location how exactly that affects 3 00:00:09,216 --> 00:00:09,728 Merging 4 00:00:10,496 --> 00:00:15,104 Multiplication can be difficult 5 00:00:15,360 --> 00:00:20,224 I'm going to show you exactly how it works here 6 00:00:20,480 --> 00:00:23,808 3 multiplication is ultimately about the relationship 7 00:00:24,064 --> 00:00:26,368 Between your images 8 00:00:26,880 --> 00:00:28,160 And it's alpha channel 9 00:00:28,672 --> 00:00:30,976 In a properly premultiplied image 10 00:00:31,232 --> 00:00:33,024 How far is 1 11 00:00:33,280 --> 00:00:34,560 Images of pig 12 00:00:35,072 --> 00:00:36,864 Alpha channel zero 13 00:00:37,376 --> 00:00:39,168 Images completely transparent 14 00:00:39,680 --> 00:00:44,032 A great that is in between 15 00:00:45,312 --> 00:00:49,408 Image 16 00:00:49,920 --> 00:00:52,992 Let's take a look at this image for it was premultiplied 17 00:00:56,320 --> 00:01:00,269 In anyway 18 00:01:00,271 --> 00:01:02,619 Subtitled by -♪ online-courses.club ♪- We compress knowledge for you! https://t.me/joinchat/ailxpXoW3JVjYzQ1 19 00:01:02,620 --> 00:01:02,208 Pacino 20 00:01:05,792 --> 00:01:07,584 I'm not one to one 21 00:01:08,608 --> 00:01:12,960 This is because right now is considered to be on premultiplied 22 00:01:13,472 --> 00:01:18,080 And the rtb 23 00:01:18,336 --> 00:01:19,872 With each other 24 00:01:20,128 --> 00:01:24,736 Because the RGB channel has not had the alpha cut-out applied 25 00:01:24,992 --> 00:01:30,112 Image it's pretty straightforward 26 00:01:32,928 --> 00:01:34,464 And what's going to do 27 00:01:34,720 --> 00:01:36,256 Is x 28 00:01:39,072 --> 00:01:40,352 Alpha 29 00:01:40,608 --> 00:01:46,240 What is happening here 30 00:01:48,288 --> 00:01:50,848 So here we have our 31 00:01:51,872 --> 00:01:56,224 Image we can see the alpha is for 32 00:01:56,480 --> 00:02:01,600 And we have is our mat 33 00:02:01,856 --> 00:02:05,184 And so these are perfect representations of our Alpha 34 00:02:05,440 --> 00:02:08,000 What is indicating here 35 00:02:08,256 --> 00:02:10,816 What we need to do is x 36 00:02:15,424 --> 00:02:17,728 So we can make a note here 37 00:02:19,520 --> 00:02:21,312 What's the inputs with she 38 00:02:21,568 --> 00:02:22,336 X 39 00:02:23,360 --> 00:02:25,920 Multiply 40 00:02:26,176 --> 00:02:29,504 X 41 00:02:30,272 --> 00:02:32,832 Why does Matt and you can see 42 00:02:33,856 --> 00:02:36,672 Exactly like our premultiplied image 43 00:02:37,184 --> 00:02:41,024 Load is just a simplified version of this data 44 00:02:41,792 --> 00:02:44,608 Is represented by 45 00:02:45,120 --> 00:02:46,400 RGB Alpha 46 00:02:46,656 --> 00:02:49,984 Pipe is represented by the supply now 47 00:02:54,848 --> 00:02:57,152 It's only changing your RGB 48 00:02:57,408 --> 00:02:59,200 Based on your alpha channel 49 00:02:59,456 --> 00:03:03,296 Assuming dose of the channels you have selected for pre multiplication 50 00:03:05,344 --> 00:03:11,488 A properly promoted in it has now been created because our alpha and 51 00:03:17,376 --> 00:03:23,520 Relationship between your information and your alpha is incredibly important 52 00:03:23,776 --> 00:03:28,640 An element together because of how the operation works in nuke 53 00:03:30,944 --> 00:03:33,248 Altered image here 54 00:03:36,832 --> 00:03:38,880 Create a merge 55 00:03:44,256 --> 00:03:49,632 Now this is what we're expected to look like this is our image 56 00:03:49,888 --> 00:03:54,496 Just been married over 3 multiplication was correct 57 00:03:54,752 --> 00:03:57,568 Getting any weird line 58 00:03:57,824 --> 00:04:02,176 Not seen any added but everything is working correct 59 00:04:02,688 --> 00:04:03,712 What happened 60 00:04:03,968 --> 00:04:06,272 If this wasn't supplied correctly 61 00:04:06,784 --> 00:04:08,832 What does turn off display mode 62 00:04:15,488 --> 00:04:17,280 Is getting plastered over 63 00:04:18,559 --> 00:04:23,423 This background image if we change the operation + which just add the two images together 64 00:04:23,679 --> 00:04:25,727 You will see 0 change 65 00:04:28,031 --> 00:04:30,079 Because he works 66 00:04:30,591 --> 00:04:32,383 Operation 67 00:04:32,639 --> 00:04:35,711 Is actually please plus in elements together 68 00:04:36,223 --> 00:04:38,271 It just uses the alpha channel 69 00:04:38,527 --> 00:04:44,415 It doesn't want the original image of take a look at exactly what this means 70 00:04:48,255 --> 00:04:53,631 Just a crazy person what's changed the smell of here 71 00:04:53,887 --> 00:04:54,655 2 + 72 00:04:56,703 --> 00:04:58,239 And we have a turtle 73 00:04:58,751 --> 00:05:00,031 What's over here 74 00:05:00,543 --> 00:05:02,335 And then we can do 75 00:05:03,359 --> 00:05:05,151 Omakanta Verge 76 00:05:05,919 --> 00:05:07,199 Stencil 77 00:05:07,455 --> 00:05:08,735 Outdoor sofa 78 00:05:11,295 --> 00:05:17,439 Certainly onerous this looks just like her over and just make one after the side here to that 79 00:05:20,511 --> 00:05:26,655 There is 0 different between these two measures of Visual EC exam 80 00:05:27,935 --> 00:05:29,727 So we have her back Village 81 00:05:30,751 --> 00:05:33,567 Taking her Alpha 82 00:05:35,615 --> 00:05:38,175 Background image 83 00:05:38,687 --> 00:05:43,295 And then passing the entirety of this a pipe 84 00:05:45,343 --> 00:05:46,623 Into you are back 85 00:05:47,135 --> 00:05:48,159 At this point 86 00:05:48,415 --> 00:05:52,255 The alpha is not affecting what is getting passed over 87 00:05:53,279 --> 00:05:58,143 Extent or alpha is applied in RGB 88 00:05:58,399 --> 00:06:04,543 No change 89 00:06:04,799 --> 00:06:05,311 Type over 90 00:06:05,823 --> 00:06:09,407 Suddenly when your Image is not premultiplied correctly 91 00:06:10,943 --> 00:06:15,807 You get all of this on 92 00:06:16,063 --> 00:06:18,367 That's because our alpha is not correct 93 00:06:19,135 --> 00:06:25,279 When it comes to the stage it doesn't matter where your outfit is as far as he's concerned all that matters 94 00:06:25,535 --> 00:06:29,631 So this is why when you don't have an alpha channel 95 00:06:29,887 --> 00:06:31,935 Images of plus together 96 00:06:32,447 --> 00:06:34,239 I'll take a look at another example 97 00:06:34,751 --> 00:06:36,031 Happened 98 00:06:36,287 --> 00:06:39,103 If we accidentally pre-ordered this twice 99 00:06:42,943 --> 00:06:46,271 Slight 100 00:06:47,295 --> 00:06:53,439 And that's because promoting our image once and then you can see it 101 00:06:58,047 --> 00:07:00,095 Has it changed in size 102 00:07:00,351 --> 00:07:06,495 The Passover is head multiplication apply twice so it's edges or twice is 103 00:07:07,007 --> 00:07:08,543 As they were intended to be 104 00:07:09,311 --> 00:07:10,847 And these Dark Hedges 105 00:07:11,103 --> 00:07:13,663 And the additive issues that we sorted 106 00:07:13,919 --> 00:07:16,479 Are the two main issues 107 00:07:16,735 --> 00:07:19,551 When your footage is not 3 multiplied correctly 108 00:07:24,415 --> 00:07:26,207 And why is that 109 00:07:29,791 --> 00:07:30,559 Again 110 00:07:30,815 --> 00:07:32,095 This is a full Alpha 111 00:07:32,863 --> 00:07:35,423 Ask limit 112 00:07:39,007 --> 00:07:40,543 There 113 00:07:41,311 --> 00:07:43,359 Change the two mask 114 00:07:44,895 --> 00:07:47,199 Operation 115 00:07:47,455 --> 00:07:50,527 Is essentially a multiplying your rgba 116 00:07:51,039 --> 00:07:52,063 By the Alpha 117 00:07:54,111 --> 00:07:56,671 It's very similar to 3 multiplication 118 00:07:57,183 --> 00:07:59,487 Accepted also changes the Alpha 119 00:07:59,999 --> 00:08:01,791 What sensor is affecting 120 00:08:02,047 --> 00:08:04,863 Your alpha and your RGB equally 121 00:08:05,375 --> 00:08:11,519 This is a safe operation that will cause any pre multiplication issues 122 00:08:12,031 --> 00:08:13,311 Because remember 123 00:08:13,567 --> 00:08:16,895 Our end goal is to have an RGB 124 00:08:17,151 --> 00:08:19,455 With her alpha channel 125 00:08:19,711 --> 00:08:22,015 Affects both equally 126 00:08:22,271 --> 00:08:24,831 So this is a properly premultiplied in 127 00:08:26,111 --> 00:08:29,951 With the central it is affecting our alpha channel 128 00:08:30,207 --> 00:08:32,255 And rrgb equally 129 00:08:32,511 --> 00:08:36,863 Inside the image remains correctly premultiplied and ready to merge 130 00:08:37,119 --> 00:08:39,935 Multiplication 131 00:08:40,191 --> 00:08:44,543 What's happened to actually going to put this into practice 132 00:08:44,799 --> 00:08:47,103 Purposely break or 3 multiplication 133 00:08:47,359 --> 00:08:48,639 Get better key 8864

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