How to optimize large images on hosting?

Question

Image processing

The essence of the problem lies in the fact that images larger than 4 megabytes cannot be optimized due to memory limitations on the server. I do not want to increase the memory for this.
Tell me, maybe there are modern algorithms or libraries that allow you to work with pictures from 4 megabytes to about 10 megabytes?
By optimization, I mean such processes as cropping, compression, quality reduction. In general, such procedures, after which a picture weighing 4 meters, has a weight of 400 kb or less ...

Answer 1

How much memory do you have that is not enough for a picture in 4mb ???
Are you setting up a web server on an Arduino? )))
I believe more that everything depends on some other parameters, for example, during the execution of the script, but not in memory.

Answer 2

Download to your computer, process and upload. The fastest. You are now taking a steam bath because of the resources that abound on your computer and are racking your brains on how to fix the clumsy architecture that's minimal. Merge and image stone resizer to help you. Saves folder hierarchy.