Challenge 3: Why "Compositing" Means the Same Thing Across This Site's Courses — Solution Walkthrough

The answer:

Per this chapter's own material, "compositing" refers to genuinely the
same underlying concept in each place it's used — combining and
adjusting already-produced visual elements after the fact — even
though the specific tool and the source material differ each time.

Why the underlying concept is identical despite different tools:

Raster Editing Fundamentals' own imageedit2 combines separate
photographs into one seamless image; Video Editing Fundamentals' own
color grading adjusts already-edited video footage's own overall tone;
this chapter combines Blender's own separately rendered 3D passes. In
every case, the actual production work (photographing, filming,
rendering) already happened, and compositing is a separate, later step
that combines or adjusts those already-produced pieces.

Why this matters for recognizing the pattern:

Once "compositing" is understood as this general concept — combining
and adjusting finished visual elements after their initial production
— encountering it in a new tool (Blender's own Compositor) requires no
new underlying idea, only recognizing that the same general workflow
step is being applied to a new kind of source material (rendered
passes) using a new specific tool (node-based compositing rather than
layers or color-grading panels).

WHY THIS WORKS AS AN ANSWER
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This exercise checks that "compositing" is correctly recognized as the
same underlying concept across all three courses, distinguishing the
shared concept from the different specific tools and source materials
each course actually uses.