User:Heddy/thumbnail test
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- Images used
- Original JPEG image: File:S2 Sorella Brella Promo Image1.jpg
- Converted to PNG: File:S2 Sorella Brella Promo Image1.png
- General info
- JPEG images are scaled down to thumbnail size using JPEG quality 80, MediaWiki's default (and non-configurable) quality setting.
- JPEG quality ranges from 0 to 100.
- PNG images remain PNG after scaling down to thumbnail size. PNG format does not introduce artifacts on its own.
- Any zoomed versions of images on this page are in PNG to avoid introducing additional JPEG artifacts when scaling the images up.
- Comparison
 |
MediaWiki scaled JPEG thumbnail |
 |
Independently scaled 100% quality JPEG thumbnail |
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PNG thumbnail |
- Discoloration is present in the top image. The bright orange circles on the umbrella are a more grayish color.
- Blurriness is present in the top image. Details are smeared together and the image is no longer well-defined enough to grab the viewer's attention.
- Unacceptable levels of JPEG blocking are present around edges in the top image. Let's zoom in to show the artifacts more clearly:
| Zoomed MediaWiki JPEG | Zoomed 100% quality JPEG |
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