PNG with transparency getting converted to JPG after uploads

[Falco]

Well, I just tried it here and the new feature is completely skipping this image:

Transforming CorePatchnotes_Banner.png
Image has transparent pixels, won't convert to JPEG!

Looks like it’s getting converted into a JPEG server side, so it’s not related to the new Client side image optimization enabled by default. Moving to a support topic.

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The issue you report is detailed at

Why default to converting PNG to JPG?

I fully understand (and appreciate!) that this is exposed as a site setting for administrators to toggle, but I find this “feature” to be very misguided in the first place. There are two hugely important features of PNGs: its lossless (and readable!) representation of text and support for transparency. Both of these are important reasons to use PNGs. As a user of a discourse site, I uploaded an image (of text with transparency) to my board and was highly disappointed to see it auto-convert to…