Graphics Programs Reference
In-Depth Information
26. The last step is just connecing the image output of the last mix node to the image
input of the composite node.
And that's it! Your full node setup is ready to process the rendered image and get it to look
very nice!
Objective Complete - Mini Debriefing
In this part of the project, we worked exclusively on the node setup to create the final
composite that will get our render looking very nice.
We start by generaing a simple blurred version of the fragment of the atmosphere object
that is visible in the rendered image by irst extracing its mask from the render (
ID Mask
node), then blurring it, and finally performing a bit of tweaking with an
RGB Curves
node.
Row "A1" is used to generate another blurred version of the arc of the atmosphere object.
But this ime we perform a trick by irst blurring, then applying a curve, and then blurring
again. This way, we get a blurred image showing only the center of the arc, which we will
use to simulate the sun 'rising' on the rim of the earth.
The purpose of row "A1A" is to take the result of row "A1" and convert it to a nice, strong
highlight of the sun. First we apply a curve to increase the contrast a lot. Then we apply a glare
ilter to create the highlights and inally, we perform a small correcion with another curve.
In row "B", we start by convering the rendered image to grayscale (
Saturation
to
0.0
); we
then perform a very strong darkening of the image with a curve followed by a
Bilateral Blur
filter that works almost the same as the common
Blur
filter, but tries to preserve the sharp
borders of the image. Finally, we add a
controlledGlow
node group that works by taking
the image and mapping it to a
ColorRamp
, thus convering the sot grayscale look into a
very colorful one. Both
controlledGlow2
and
controlledGlow3
perform the exact same
work as
controlledGlow1
; the only difference is that the
ColorRamps
seings on each one
are different. The usage of the
Set Alpha
and
Convert Alpha
nodes is needed to get image
buffers that are useful for the mixing process.
The five mix nodes that we used are all set to
Add
mode, as we are staring with an image
that is mostly dark and need to get it to look colorful, and have some strong highlights. The
value of the
Fac
parameter is raised depending on how strong the inluence of the botom
image input should be.
It is highly recommended to use
Viewer
nodes to inspect the result of each node in the chain
and understand clearly what the logic is that is driving it.
