ADVANCED COMPOSITING & RETOUCHING - Chapter 9, Exercise 1
Installing Wavelet Decompose Into GIMP, Step by Step
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QUESTION:
Walk through, step by step, how you would install the Wavelet Decompose
script into GIMP so it appears as a usable filter.

SOLUTION / EXPLANATION:

Following this chapter's own walkthrough of GIMP's script installation
model:

1. Download the Wavelet Decompose script file itself - like most Script-Fu
   scripts, it's a plain text file with a .scm extension, not a packaged
   installer application.

2. Open GIMP and go to Edit > Preferences > Folders > Scripts. This screen
   shows the exact folder path (or paths) GIMP scans on startup for
   available Script-Fu scripts - this is the destination the file needs to
   go into, and it's worth confirming the exact path shown here rather than
   guessing, since it can vary by operating system and GIMP installation.

3. Copy the downloaded .scm file directly into that Scripts folder, using
   your operating system's normal file manager - no GIMP-specific install
   process is involved at this step, it's simply placing a file into a
   folder.

4. Back in GIMP, run Filters > Script-Fu > Refresh Scripts. This tells GIMP
   to re-scan its Scripts folder immediately and load anything new it
   finds, without requiring a full restart of the application.

5. Wavelet Decompose should now appear as a usable filter in GIMP's Filters
   menu (typically under a category like Enhance, depending on how the
   script registers itself), ready to run on an open image exactly like any
   built-in filter.

A useful sanity check before relying on it for real client work: confirm
the script's own documentation states it's compatible with your specific
installed GIMP version, since (as this chapter also covers) older
Script-Fu scripts written before the GEGL transition can behave incorrectly
or fail entirely on newer GIMP versions.

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WHY THIS WORKS AS AN ANSWER:
It reproduces the exact installation sequence from the chapter in the
correct order (locate the Scripts folder, copy the file, refresh scripts
without restarting), and adds the chapter's own compatibility-checking
advice as a final practical step rather than treating installation as
finished the moment the file is copied.