https://bugzilla.wikimedia.org/show_bug.cgi?id=18014
Summary: Thumbnailing produces much worse results for PNGs than
JPG, but PNG is the only real option for serious
restoration
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: Images
AssignedTo: [email protected]
ReportedBy: [email protected]
Compare these two files. The originals are as near-identical as a JPG and PNG
can be:
http://upload.wikimedia.org/wikipedia/commons/thumb/5/58/Tameing_a_Shrew%3B_or%2C_Petruchio%27s_Patent_Family_Bedstead%2C_Gags_%26_Thumscrews.png/251px-Tameing_a_Shrew%3B_or%2C_Petruchio%27s_Patent_Family_Bedstead%2C_Gags_%26_Thumscrews.png
http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Tameing_a_Shrew%3B_or%2C_Petruchio%27s_Patent_Family_Bedstead%2C_Gags_%26_Thumscrews.jpg/251px-Tameing_a_Shrew%3B_or%2C_Petruchio%27s_Patent_Family_Bedstead%2C_Gags_%26_Thumscrews.jpg
(Forgive the image itself - I discovered it with this image, meant to
illustrate misogyny.)
As you can see, the PNG looks much, much blurrier.
However, PNG is also the only option for any serious restoration work. If we
have to use JPG on Wikipedia anyway, then we're basically saying that a
more-degraded file that cannot easily be edited is the only version that most
people will know about.
This is a problem.
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