* See also these automated build alternatives added in 2.1:
*     ./_generate.sh
*     ../../build/generate-examples.py

# This gallery demos 2.1's improved and customizable thumbnail images.
# Its index page uses a custom header file: see HEADER.html in its folder.
# The fuller run log below was run on macOS, but Windows, Linux, and Android 
# work just as well and with visually identical results using Pillow 7 and 8.
# Minor plus: 2.1 also appends the image-folder name to the last run message.
# Also note: thumbs per row is not input when 2.1's new dynamic layout is used.

-------------------------------------------------------------------------------
# WINDOWS

C:\Users\me\Desktop\DEV\tp21\examples>py -3 ..\thumbspage.py 2.1-upgrades
Clean thumbs folder [y or n] (enter=y)?
Thumbs per row [int] (enter=4)? 2
Thumb max size [x, y] (enter=(100, 100))? 128,128
Use image-viewer pages [y or n] (enter=y)?
Running
Cleaning: 2.1-upgrades\_thumbspage\A-normzoom-2.0-blurry-1.png
...
Making thumbnail: 2.1-upgrades\_thumbspage\A-normzoom-2.0-blurry-1.png
..
Generating thumbnails index page
Generating view page for: A-normzoom-2.0-blurry-1.png
...
Finished: see the results in the images folder, "2.1-upgrades".

-------------------------------------------------------------------------------
# MACOS

~/MY-STUFF/Code/thumbspage/examples$ python3 ../thumbspage.py 2.1-upgrades
Clean thumbs folder [y or n] (enter=y)? 
Thumbs per row [int] (enter=4)? 2
Thumb max size [x, y] (enter=(100, 100))? 128,128
Use image-viewer pages [y or n] (enter=y)? 
Running
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-4-fullscreen.png.html
Cleaning: 2.1-upgrades/_thumbspage/M-highzoom-2.0-vs-2.1-sharp+quality.png.html
Cleaning: 2.1-upgrades/_thumbspage/Y-windows-2.0-blurry.png.html
Cleaning: 2.1-upgrades/_thumbspage/K-highzoom-2.1-sharp-only.png
Cleaning: 2.1-upgrades/_thumbspage/Y-mobile-2.0-blurry.jpg
Cleaning: 2.1-upgrades/_thumbspage/X-sharpness2.5-too-much-surreal.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-3-scaling.png
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-2.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-2-info.png
Cleaning: 2.1-upgrades/_thumbspage/H-highzoom-2.0-noise-and-blurry.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-1.png.html
Cleaning: 2.1-upgrades/_thumbspage/F-normzoom-2.0-vs-2.1-presets-2.png.html
Cleaning: 2.1-upgrades/_thumbspage/Y-mobile-2.1-notblurry.jpg.html
Cleaning: 2.1-upgrades/_thumbspage/J-highzoom-2.0-vs-2.1-quality-only.png.html
Cleaning: 2.1-upgrades/_thumbspage/M-highzoom-2.0-vs-2.1-sharp+quality.png
Cleaning: 2.1-upgrades/_thumbspage/Y-windows-2.0-blurry.png
Cleaning: 2.1-upgrades/_thumbspage/L-highzoom-2.1-sharp+quality.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-3-scaling.png.html
Cleaning: 2.1-upgrades/_thumbspage/L-highzoom-2.1-sharp+quality.png
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-2-info.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-1.png.html
Cleaning: 2.1-upgrades/_thumbspage/X-black-and-white-thumbs-mode.png.html
Cleaning: 2.1-upgrades/_thumbspage/X-way-too-much-tweaking.png
Cleaning: 2.1-upgrades/_thumbspage/B-normzoom-2.1-notblurry-1.png.html
Cleaning: 2.1-upgrades/_thumbspage/C-normzoom-2.0-blurry-2.png.html
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-1.png
Cleaning: 2.1-upgrades/_thumbspage/Y-mobile-2.1-notblurry.jpg
Cleaning: 2.1-upgrades/_thumbspage/G-normzoom-2.0-vs-2.1-presets-3.png
Cleaning: 2.1-upgrades/_thumbspage/C-normzoom-2.0-blurry-2.png
Cleaning: 2.1-upgrades/_thumbspage/X-black-and-white-thumbs-mode.png
Cleaning: 2.1-upgrades/_thumbspage/A-normzoom-2.0-blurry-1.png.html
Cleaning: 2.1-upgrades/_thumbspage/Y-windows-2.1-notblurry.png
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-4-fullscreen.png
Cleaning: 2.1-upgrades/_thumbspage/Y-mobile-2.0-blurry.jpg.html
Cleaning: 2.1-upgrades/_thumbspage/B-normzoom-2.1-notblurry-1.png
Cleaning: 2.1-upgrades/_thumbspage/E-normzoom-2.0-vs-2.1-presets-1.png
Cleaning: 2.1-upgrades/_thumbspage/G-normzoom-2.0-vs-2.1-presets-3.png.html
Cleaning: 2.1-upgrades/_thumbspage/H-highzoom-2.0-noise-and-blurry.png
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-2.png
Cleaning: 2.1-upgrades/_thumbspage/D-normzoom-2.1-notblurry-2.png.html
Cleaning: 2.1-upgrades/_thumbspage/D-normzoom-2.1-notblurry-2.png
Cleaning: 2.1-upgrades/_thumbspage/A-normzoom-2.0-blurry-1.png
Cleaning: 2.1-upgrades/_thumbspage/J-highzoom-2.0-vs-2.1-quality-only.png
Cleaning: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-1.png
Cleaning: 2.1-upgrades/_thumbspage/F-normzoom-2.0-vs-2.1-presets-2.png
Cleaning: 2.1-upgrades/_thumbspage/K-highzoom-2.1-sharp-only.png.html
Cleaning: 2.1-upgrades/_thumbspage/X-sharpness2.5-too-much-surreal.png
Cleaning: 2.1-upgrades/_thumbspage/I-highzoom-2.1-quality-only.png.html
Cleaning: 2.1-upgrades/_thumbspage/E-normzoom-2.0-vs-2.1-presets-1.png.html
Cleaning: 2.1-upgrades/_thumbspage/X-way-too-much-tweaking.png.html
Cleaning: 2.1-upgrades/_thumbspage/Y-windows-2.1-notblurry.png.html
Cleaning: 2.1-upgrades/_thumbspage/I-highzoom-2.1-quality-only.png
Making thumbnail: 2.1-upgrades/_thumbspage/K-highzoom-2.1-sharp-only.png
Making thumbnail: 2.1-upgrades/_thumbspage/Y-mobile-2.0-blurry.jpg
Skipping: index.html
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-3-scaling.png
Skipping: .DS_Store
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-2-info.png
Skipping: _thumbspage
Making thumbnail: 2.1-upgrades/_thumbspage/M-highzoom-2.0-vs-2.1-sharp+quality.png
Making thumbnail: 2.1-upgrades/_thumbspage/Y-windows-2.0-blurry.png
Making thumbnail: 2.1-upgrades/_thumbspage/L-highzoom-2.1-sharp+quality.png
Making thumbnail: 2.1-upgrades/_thumbspage/X-way-too-much-tweaking.png
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-1.png
Making thumbnail: 2.1-upgrades/_thumbspage/Y-mobile-2.1-notblurry.jpg
Making thumbnail: 2.1-upgrades/_thumbspage/G-normzoom-2.0-vs-2.1-presets-3.png
Making thumbnail: 2.1-upgrades/_thumbspage/C-normzoom-2.0-blurry-2.png
Making thumbnail: 2.1-upgrades/_thumbspage/X-black-and-white-thumbs-mode.png
Making thumbnail: 2.1-upgrades/_thumbspage/Y-windows-2.1-notblurry.png
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-viewer-pages-4-fullscreen.png
Making thumbnail: 2.1-upgrades/_thumbspage/B-normzoom-2.1-notblurry-1.png
Making thumbnail: 2.1-upgrades/_thumbspage/E-normzoom-2.0-vs-2.1-presets-1.png
Making thumbnail: 2.1-upgrades/_thumbspage/H-highzoom-2.0-noise-and-blurry.png
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-2.png
Making thumbnail: 2.1-upgrades/_thumbspage/D-normzoom-2.1-notblurry-2.png
Making thumbnail: 2.1-upgrades/_thumbspage/A-normzoom-2.0-blurry-1.png
Making thumbnail: 2.1-upgrades/_thumbspage/J-highzoom-2.0-vs-2.1-quality-only.png
Making thumbnail: 2.1-upgrades/_thumbspage/Z-2.1-index-pages-1.png
Making thumbnail: 2.1-upgrades/_thumbspage/F-normzoom-2.0-vs-2.1-presets-2.png
Making thumbnail: 2.1-upgrades/_thumbspage/X-sharpness2.5-too-much-surreal.png
Skipping: HEADER.html
Skipping: _HOW-MADE.txt
Making thumbnail: 2.1-upgrades/_thumbspage/I-highzoom-2.1-quality-only.png
Generating thumbnails index page
Generating view page for: A-normzoom-2.0-blurry-1.png
Generating view page for: B-normzoom-2.1-notblurry-1.png
Generating view page for: C-normzoom-2.0-blurry-2.png
Generating view page for: D-normzoom-2.1-notblurry-2.png
Generating view page for: E-normzoom-2.0-vs-2.1-presets-1.png
Generating view page for: F-normzoom-2.0-vs-2.1-presets-2.png
Generating view page for: G-normzoom-2.0-vs-2.1-presets-3.png
Generating view page for: H-highzoom-2.0-noise-and-blurry.png
Generating view page for: I-highzoom-2.1-quality-only.png
Generating view page for: J-highzoom-2.0-vs-2.1-quality-only.png
Generating view page for: K-highzoom-2.1-sharp-only.png
Generating view page for: L-highzoom-2.1-sharp+quality.png
Generating view page for: M-highzoom-2.0-vs-2.1-sharp+quality.png
Generating view page for: X-black-and-white-thumbs-mode.png
Generating view page for: X-sharpness2.5-too-much-surreal.png
Generating view page for: X-way-too-much-tweaking.png
Generating view page for: Y-mobile-2.0-blurry.jpg
Generating view page for: Y-mobile-2.1-notblurry.jpg
Generating view page for: Y-windows-2.0-blurry.png
Generating view page for: Y-windows-2.1-notblurry.png
Generating view page for: Z-2.1-index-pages-1.png
Generating view page for: Z-2.1-index-pages-2.png
Generating view page for: Z-2.1-viewer-pages-1.png
Generating view page for: Z-2.1-viewer-pages-2-info.png
Generating view page for: Z-2.1-viewer-pages-3-scaling.png
Generating view page for: Z-2.1-viewer-pages-4-fullscreen.png
Finished: see the results in the images folder, "2.1-upgrades".