How can images be optimized losslessly in Java?

Question

Java

Hello.
There is a site catalog of objects, which provides a very large number of photographs. Trying to look to the future, we decided to make the allowable photo size 2560px.
There is a question of compressing uploaded photos, but an important condition is "without quality loss".
The usual JPG compression, specified as a percentage of 100, is not suitable.
For me, the ideal to follow is the quality of compression by the service https://tinyjpg.com/
Question: tell me, are there free / paid JAVA libraries for lossless image compression. It would also be useful to have information about specialists who are able to make such a library to order. And if there are none, then in which direction should our programmer direct his efforts to delve into this topic?
Thanks

Answer 1

At the moment, we finally found an open library on GitHub that compresses lossless photos very well.
True, it is not written in Java, but in C ++. The programmer said that you just need to adapt to Java.
However, this is by far the best solution.
Demo site: https://github.com/Lymphatus
GitHub page: https://github.com/Lymphatus

Answer 2

I'll try to guess how this TinyJPG works:
Those who did not notice the difference in A / B tests will not notice the difference in any images compressed using this algorithm.

Answer 3

You can hang a watcher that will monitor the appearance of new images on the site and compress in the background without losing quality,
for example, this
https://github.com/OrlovEvgeny/TinyJPG

Answer 4

https://github.com/coobird/thumbnailator/