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In this clip we're going to take a look at green screen keying QC checklist.
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So a QC checklist is a quality check checklist and we want to use
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this so that we can make sure that we have all the fine details
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needed to take this particular image to final.
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So let's take a look at the first item.
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So the first item is alphas.
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So are the core alphas opaque where needed?
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So we want to make sure that there are no holes in our alpha and to do
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this we're going to color slam the LUT to QC our image.
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So color slam the gamma up and down to make sure that
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there are no holes in our core alpha,
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but also to make sure that there isn't too much information
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or artifacting in our backing region.
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Next, we're going to see if there is any buzzing in our alpha.
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So we want to make sure that there is no buzzing because those
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really create unstable edges and as a result it doesn't have a
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very good output for our final composite.
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Next we're going to take a look at order of operation.
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So we want to make sure that we have the correct order
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of operation for color correction.
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So color correction should be done on premultiplied images.
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So if you have a premultiplied image, be sure to un-premultiply it first,
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complete your color correction, and premultiply it,
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and this really helps to retain all the information in our edges.
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Next we looked at optimized concatenation.
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So we want to make sure that all of our transform tools are
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grouped together in the same location.
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Don't break them up with non-concatenating tools.
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If we do so,
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we can actually introduce lowered resolution or lowered details in our image.
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So we want to retain as much detail as possible so
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keep all transform tools together.
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Next we looked at correct round-tripping.
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So it's very important to round-trip our images back to the original state.
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So an example of this is moving from linear color space into log,
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perhaps completing a key,
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and then round- tripping back to that linear color space.
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So just make sure that when you are doing these operations,
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that they are round-tripped correctly in order to continue on with our comp.
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Next we're going to take a look at edge details.
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So are all the edges, the transparency,
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motion blur and wispy details retained in comparison to the original plate?
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So for example, if we don't retain that information,
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it's going to be harder to convince that this wasn't a green screen image.
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So we want to retain that information so that it looks like
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it's better integrated into our final plate.
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Next we're going to take a look at despill.
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So has all the spill been correctly removed?
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So we want to make sure that any light-colored skin isn't accidentally changed,
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that the blonde hair isn't turning magenta,
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and that any light-colored materials or clothing hasn't changed as well.
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So make sure that we are retaining the color information that we need
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and that we haven't pushed that despill too far.
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Next we take a look at has the despill been completed
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separately from the final alpha.
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So this is really important when it comes to advanced keying.
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Basically we don't want to have any patchwork quilt-like images from
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completing the despill and the keying together in one step.
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So make sure that all of your color correction and your despill is
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completed on the plate separately and that the alpha is applied
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after the fact for the final composite.
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Next we take a look at artifacting.
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So are any artifacts still visible?
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So for example, in the backing region.
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So 5% opacity in the backing region is a good place to start.
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It doesn't always work.
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So you might have to drop it below that 5%,
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but just double check with your background image to see if
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it's visible and if it's causing any issues.
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And of course, we're going to take a look at final integration.
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So does the color in all the elements match?
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So does the foreground green screen element now match with the new background?
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Does it look like it's taken in the same location?
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So this is really important in order to convince the viewer
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that this is a non-green screen image.
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Does the green screen noise match all of the remaining assets?
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So we want to make sure that we take the noise from the green screen image,
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we retain it, and then we match all of the elements surrounding it to that noise,
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again so it looks like it was all taken in the same plate.
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Does the green screen image's focus match that of the remaining elements?
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So maybe we take the green screen image and that's going to
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drive the focus of the rest of the shot.
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So if that is the case,
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just make sure that your new background image matches
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the focus of your foreground image.
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Comp optimization.
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So have all unneeded tools been removed, disabled, or pre-comped?
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So this is very important because we want to make sure
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that this comp has been optimized, that it is running as smoothly as possible.
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So unneeded tools can slow down your composite.
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It can become very confusing for other artists that pick
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up your script and elements that are not pre-comped can
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actually slow down your script.
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So for something such as pre-processing,
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that's a really great thing to pre-comp,
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bring it in as a new image sequence,
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again just to optimize and speed up your comp.
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