Full transcript
0:00after we've tone mapped the image we can
0:02now move to the color matching and this
0:05is an actual post processing so within
0:09the histogram we can also click the rgb
0:12buttons here and you can see now we get
0:15a more detailed looks on
0:17the information from our images and here
0:20in the rendering you can see we have
0:22more of the blue and green color
0:25in the darker tones
0:27than in the original image this is
0:30something a little bit different to the
0:33luma preview here you don't always have
0:36to try matching those curves
0:40to these ones because as i said already
0:43the most important thing is the overall
0:46look of our rendering
0:48but now let's get into the color
0:51post-processing
0:53the first step i usually do in blender
0:56directly is matching the tones of the
0:59elements so for example
1:02adjusting the color of the wooden
1:04elements to what we have
1:06in the rendering i'm gonna
1:09quickly go to the full screen here press
1:12shift
1:13a
1:15and choose the
1:17uh hue correct by the way you can see we
1:19have many color notes here but i'm just
1:22gonna i usually go very simple so i just
1:24do hue correction
1:26color balance and sometimes color
1:29correction so let's start with the hue
1:32correction
1:33i'm gonna drop this note here so it
1:37joins the link
1:39i'm going to exit the full screen
1:42and zoom into the node itself so you can
1:45see we have those points
1:47along the graph and they represent the
1:49certain color hues as you can see here
1:53we can change the hue
1:55of this
1:56color
1:58range saturation of this color range and
2:00its value
2:02practically it looks more or less like
2:04this let's say
2:05i want to adjust my wooden part as i
2:08mentioned
2:09and i want to change its hue so i just
2:13press the h
2:14i can hear and move the graph up and
2:17down and you can see
2:19this change only affects the red orange
2:23kind of colors from the spectrum
2:26so everything else stays untouched
2:29let me zoom in back to the wooden
2:31elements
2:33i advise
2:34checking the color adjustments on a sir
2:37on a few parts
2:40of the wooden elements because they look
2:42different in different part of the image
2:45um
2:46yeah so
2:47i think we could add a little bit of
2:50this yellowy
2:51tone to it
2:53um i think we could also add a little
2:55bit of brightness so let's switch to the
2:58value here and move
3:00this handle up as you can see
3:03the material becomes brighter
3:07let's now go to this side maybe and
3:09compare it
3:13yeah i think more or less we are getting
3:15there perhaps we can reduce the
3:17saturation slightly
3:20you will also see that in the photoshop
3:23post-production video that
3:25all of those changes are very delicate
3:28i'm trying to avoid very drastic moves
3:31like that
3:32so again let's
3:34get back to this element and see what
3:37happens if we decrease the saturation
3:39slightly
3:42let's go back to the hues
3:46and i think with those few little steps
3:50we actually have
3:52a pretty nice looking wooden
3:55material if we use the fak slider here
3:58this works
4:00as an opacity slider so you can see we
4:03are able to totally disable
4:05the effect of that node
4:07and you can see an instant preview here
4:10that's why it's important to use the
4:12viewer node here because it looks a
4:14little bit slower if we use the
4:15composite i prefer using the viewer here
4:18and
4:19here as well
4:20so let's maybe use the opacity of 0.8
4:26and yeah
4:28i would say that's it for the wooden
4:30material
4:31the other uh distinguishable color
4:34within our picture is this greenery
4:37behind the window so let's maybe try
4:39adjusting it as well because as you can
4:41see here it's a little bit more more
4:43yellowy
4:45so again i'm having the heel selected
4:48here
4:49you can sometimes try moving this graph
4:52up and down drastically just to see if
4:54you're affecting the right
4:57color shade
4:59so
5:01yeah i would say let's maybe try
5:03something like this something like this
5:06the changes here are very very delicate
5:10perhaps i will go with this
5:12more of this green tone to be honest
5:15i think it looks more natural
5:18yeah so now we can also
5:22change the saturation
5:24maybe increase it slightly
5:28just within the green elements
5:31and let's also
5:32[Music]
5:33adjust the value maybe reduce it
5:36slightly like this and add it here
5:40yeah so more or less this is the first
5:43step the color the hue correction
5:46now what i would like to set up is
5:49something that i already mentioned so
5:50you can see within though
5:52those gray areas
5:54uh
5:55we need a little bit of this greeny
5:58bluish tint to be added and i'm gonna
6:01use a color balance note for that so
6:04again
6:05shift a color
6:07and color balance this is how this node
6:10looks like
6:11and you might be tempted to
6:14play around with all of those color
6:16wheels i mean i suggest doing that just
6:19to get around this note and see how it
6:20works but practically what i do
6:24is just using this one here and again
6:28if i have a nicely
6:30toned map and in general nicely match
6:32the image like in our course
6:35the changes you're gonna
6:37apply here will be very very small so as
6:40you can see i'm gonna just try to shift
6:42this point towards this greeny bluish
6:45area as the tint we have here if i
6:48click here already you can see it's way
6:51too much
6:52so that has to be much more delicate
6:55maybe
6:56something like this
6:59i think we already have a little bit too
7:01much of the color within the concrete
7:04let's zoom out
7:06yeah i think especially if you compare
7:09the metal material
7:11it's already a little bit too much so
7:13let's maybe reduce it to here
7:19and yeah again i would probably reduce
7:23the overall opacity slightly but more or
7:26less you can already see
7:28those images start matching
7:30pretty nicely
7:33um still i think we could
7:36do something about the ceiling maybe
7:39so let's try to
7:41shift this
7:42point a little bit here maybe
7:45yeah as you can also see this is a
7:47pretty
7:48intuitive thing so
7:50as
7:51when we were setting up the histograms
7:53for light matching uh it was a little
7:56bit more mathematical just by setting up
7:58the values here but the curves and those
8:01color wheels this is more intuitive so
8:05uh you just need to practice a little
8:07bit
8:07try matching the colors a few times and
8:10you should get pretty
8:12good at it
8:13again i'm just gonna
8:16click
8:18here
8:20but i think that's enough sometimes you
8:22might also go back
8:23as i think we could do with our wooden
8:26element it became a little bit more
8:28yellowy after applying the color
8:30correction and that's not a problem at
8:33all so we just switch back to hues here
8:35and move this point slightly downwards
8:38so it adds this
8:40reddish tint
8:42to the wooden elements
8:45one of the final adjustments will be
8:48using the
8:49color correction
8:51node
8:53when i plug it in here you can see it
8:54has many settings
8:57but they are fairly simple
8:59as you can see our
9:01uh rendering is a little bit more
9:04saturated than the original image
9:06so what's cool about this note we can
9:09desaturate the tones depending on the
9:13amount of light they have for for
9:15example we can only desaturate
9:18the highlights this way
9:20which is usually recommended for
9:23um the most for the realistic look
9:25that's a little tip from me and now we
9:28can try to play around with the midtones
9:31for example so let's
9:33set the midtone saturation to 75 and we
9:37can go down
9:38with shadows so you can see
9:40uh the shadow settings influence our
9:43scene the most let's maybe
9:45stick to
9:47point 85 percent here
9:50um you can also see this is it's
9:52possible to
9:54use those settings for
9:56uh just a one or a few of the color
9:58channels we are not gonna do that here
10:00since it's not necessary but i'm just
10:02letting you know you could do this
10:04you can also change the general contrast
10:08of the image using this node but don't
10:10use the contrast settings because
10:13they are pretty outdated and they
10:16generate those ugly
10:19clamped out images
10:21so what i suggest using if you want to
10:25change the contrast of your picture is
10:27just sticking to the gamma settings the
10:29lower you go
10:31the bigger the contrast so let's
10:33maybe use the value of 0.95 very slight
10:38adjustment
10:40and yeah more or less perhaps
10:44we could also play around a little bit
10:45with the settings here maybe in uh
10:48increasing the highlights just a little
10:51bit let's
10:53uh actually there's not that much of a
10:55change to be honest here
10:57um let's see the midtones
11:00yeah
11:02perhaps we can increase the midtones
11:04just a little bit
11:08um but
11:10overall i think i'm pretty happy with
11:12the result i'm still not that happy
11:15maybe with the
11:16wood
11:18color
11:19so i'm just getting back to it over and
11:21over again as you can see but yeah this
11:23is the part of the process as well
11:25sometimes you just have to do it
11:29and adjust things as long as you need to
11:32for the right result
11:35the final note
11:36i would be using is
11:39a pretty basic filter
11:42and it's
11:46just a soften
11:48filter but i change it to sharpen
11:52and
11:54yeah you can see the default look is
11:56very unrealistic
11:58so i
11:59decrease it to a very small number
12:03uh 0.1 is way too much because you can
12:06see this ugly anti-aliasing
12:08being visible actually
12:10to be honest if you want to apply
12:12sharpening to your image i would suggest
12:14saving this output to a jpeg or png
12:18and doing that in photoshop directly i
12:22think this gives you much better results
12:25i'm still actually
12:27readjusting the those settings here to
12:29be honest i think we desaturated the
12:31image too much
12:32um but yeah let's now compare the
12:35histograms again
12:37and still you can see we weren't quite
12:40able to remove this bluish peak within
12:43the darker tones
12:45but our image looks pretty good i must
12:48say so
12:49i'm just gonna show you how you can
12:52examine those kind of
12:55things within the histogram just to
12:56double check if everything is okay
12:59within your picture i'm just gonna copy
13:02the image node here
13:04and open our reference
13:07and you can directly compare the color
13:10channels
13:11within the compositor so let's go to the
13:14converter
13:17separate
13:18rgba
13:20where a is for alpha
13:24we are plugging in the image input
13:27it just takes a few seconds to reload
13:30now let's duplicate the viewer node
13:34and let's use the b
13:36output here as an input so this way we
13:39can see how the
13:41blue color channel looks for this image
13:45if we click
13:47yeah it takes as i said a few seconds to
13:49reload and now we can see
13:52um so this basically you can see also
13:55the histogram updated here because we
13:57use the viewer node the one we select
14:00within the compositor
14:02so you can see we have okay some
14:04dark tones here which are represented by
14:06this part of the histogram a lot of
14:09bright tones which are represented here
14:12and some middle tones here and there
14:15spread across this part of the histogram
14:17now let's do the same
14:19for
14:20our image so i'm going to copy the note
14:23the separate rgba note
14:26and
14:27try to plug it in here if blender allows
14:31me to
14:34by default it plugs in the red channel
14:37but let's plug in the blue channel
14:41so
14:42this is our result
14:45i'm just gonna move those two viewers
14:47here sorry for the update yeah
14:50let's let's do this setup so we can
14:52switch between those viewers quickly
14:55so you can see our render input actually
14:58is a little bit different here we have a
15:01much darker in
15:03input for the blue channel of our
15:05rendering
15:06we have way less reflections here and on
15:10the floor and i guess that's the reason
15:12we have this
15:14huge peak of the bluish tint
15:16uh within this area let's
15:20switch back to that image again
15:23so yeah you can see we have way less
15:26dark tones here around the floor
15:29around those areas much more reflections
15:32being visible in the blue channel that's
15:33the reason we have almost no
15:36of the
15:38values here within the histogram
15:41in our rendering again
15:43much more darker tones so that's why
15:46this looks differently so actually the
15:49reason we have this different
15:51um
15:52different histogram looks for the blue
15:54channel
15:55is not that we did something wrong it's
15:58just
15:59because we have a little bit different
16:01render result
16:03um
16:04those graphs look differently so i would
16:07say that concludes the post-production
16:10process
16:11in blender you can still take this
16:15output image this final image we have
16:17created
16:18uh bring in
16:20to photoshop and do some final
16:22adjustments as i said you can do the
16:24sharpening in photoshop i think it looks
16:26better
16:27you can do vignetting and all those uh
16:30kind of visual post production effects
16:33but as for the tone mapping as for the
16:35color correction i think
16:37uh blender also allows us
16:40getting this pretty nice looking results
16:42so if we
16:44compare the images directly
16:46i think you can see
16:48they are pretty pretty nicely matched
16:52if we look at them in detail
16:55so yeah thank you for watching and i
16:57hope you've learned something new today
16:59thank you guys for watching this video
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