[Enhancement] different compression quality

[KarelWintersky]

Is it possible to set different JPEG compression qualities for thumbnails of different sizes?

I.e. , for example

• 90 for medium-sized tn
• 80 for small-sized tn
• 70 for thumb-sized tn

and define those settings at .env file?

[ildyria]

no.

At the moment it is 90 (default) for any size.
You can set it in your advanced config page (settings -> more at the bottom).

I don't think the gain is significant enough to be considered.

[KarelWintersky]

Also, webp does not allow define compression_quality.

[ildyria]

Any thumbs are exported to jpeg.

[KarelWintersky]

I don't think the gain is significant enough to be considered.

avg 6-20% size diff between 80% quality jpeg and 90% quality jpeg...

on galleries with a large number of photos, the difference in file sizes can be significant

[ildyria]

Well. I guess that's a project for volunteer then :)

Code to modify is mostly located here:
https://github.com/LycheeOrg/Lychee/tree/master/app/Image/Handlers