I can’t believe how miserably GUI tools fail at file formats. So, I received a transparent JPEG recently. After the WTF moment, I ran /usr/bin/file and it told me it’s a PNG file (renamed to .jpg).

Here’s how GUI apps handle it:

OS X’s Finder actually ran the format detection to display it correctly in Quick Look, but didn’t say β€œPNG renamed to JPEG” as the file format. It just said β€œJPEG image!”

Photoshop showed an error and refused to open it.


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